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Physico-Chemical and Microbiological Analysis of Water of the “Presa De Los Patos” in the Desierto De Los Leones National Park, Mexico

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DOI: 10.4236/abc.2017.72008    891 Downloads   1,422 Views  

ABSTRACT

The Desierto de los Leones National Park is a place that features recreational activities for residents and visitors to Mexico City. The Presa de los Patos (Ducks Dam) is one of the many bodies of water that are present in the park. By means of physico-chemical and microbiological analysis, it was determined that the water of the Presa de los Patos cannot be considered potable. The pH range was between 5.5 - 5.9. The turbidity exceeded the values established in the standards (10.7 - 32.3 Nephelometric Turbidity Units (NTU’s)). Chemical Oxygen Demand (COD) showed that large amounts of oxygen are needed to oxidize organic matter (106 - 450 mg/L). The amount of coliforms and fecal coliforms exceeds the values established by the standards used (total coliforms 98 - 956 Colony Forming Units (CFU’s), fecal coliforms 78 - 807 CFU’s). Five bacterial genera (Escherichia coli, Pseudomona, Klebsiella, Shigella and Salmonella) were isolated and identified. Most of the bacteria isolated were resistant to ampicillin (90%), while 25% were resistant to ciprofloxacin. The water consumption of the Presa de los Patos is a great risk for the habitants and visitors of the park.

1. Introduction

Desierto de los Leones National Park is located in the central region of the Mexican Republic, southwest of the Mexico Basin. The park is located to the west of Mexico City, within the delegations Álvaro Obregón and Cuajimalpa de Morelos (Map 1). It has the category of National Park since 1917 to preserve and protect the natural resources in Mexico [1] . The park has a high biological, environmental and ecological value, and also has an important role for recreation of the habitants of Mexico City.

Water is the universal solvent capable of dissolving nearly all solutes, which is important to living and non-living things [2] . Water is a resource that has many uses, including recreation, transportation, and hydroelectric power, domestic, industrial, and commercial uses [3] . The water of rivers plays an important role in development of the countries [4] . Water is extraordinarily abundant on the planet as a whole, but fresh potable water is not always available at the right time or the right place for human or ecosystem use [5] .

Water quality is defined as the set of physical, chemical and biological characters that must be satisfied in order to ensure that the water supplied is safe for the consumer [6] . Water pollution can cause adverse health effects for a representative number of people over predictable periods of time and is due to population growth, industrial development and urbanization [7] . In the recent past,

Map 1. Location of the desierto de los leones national park, Mexico City. The park is located to the west of Mexico City, within the delegations Álvaro Obregón and Cuajimalpa de Morelos. Source: CONANP (Comisión Nacional de Áreas Naturales Protegidas).

expanding human population, industrialization, intensive agricultural practices and discharges of massive amount of wastewater into rivers have resulted in deterioration of water quality [8] . The improper management of water systems may cause serious problems in availability and quality of water since water quality and human are closely related [9] . For degradation of the quality of surface and groundwater, one of its origins is the direct discharge of contaminated water from domestic, industrial and agricultural sources into bodies of water [10] .

Unfortunately, clean, pure and safe water only exists briefly in nature and is immediately polluted by prevailing environmental factors and human activities. Water from most sources is therefore unfit for immediate consumption without some sort of treatment [11] . The industrial pollutants associated with organic matter, inorganic dissolved solids and other unwanted chemicals cause serious problems in the water quality [12] . Water related diseases continue to be one of the major health problems globally due to consumption of contaminated water. The high prevalence of diarrhea among children and infants can be traced to the consumption of unsafe water [13] . The examination of microbiological river water quality according to technical standards is obligatory for use-related aspects such as for drinking water production, irrigation or recreation [14] .

The principal risk to human health derives from fecal contamination [15] . Human fecal material is generally considered to be a greater risk to human health as it is more likely to contain human enteric pathogens. The most im- portant aspect of water quality is its freedom from contamination with fecal matter [16] . The public health significance of water quality cannot be over emphasized. Many infectious diseases are transmitted by water through the fecal- oral route [17] . Certain physical, chemical and microbiological standards are designed to ensure the safety of water for bathing and drinking before it can be described as potable [9] . This work shows the results obtained from the physico-chemical and microbiological analysis carried out on the water of the Presa de los Patos, as well as the antimicrobial susceptibility testing against two antibiotics commonly used in Mexico.

2. Materials and Methods

Physico-chemical and microbiological essays were performed based on the tests described in Official Mexican Norm 127 (NOM-127-SSA1-1994, Saludambiental, aguaparauso y consumohumano. Límitespermisibles de calidad y tratamientos a quedebesometerse el aguaparasupotabilización) [18] , as well as the tests described in APHA-AWWA-WPCF (Standard Methods for Water and Waste Waters) [19] .

2.1. Study Area

In the north of the Park a subhumid fresh climate prevails with an average temperature of 12˚C. On the other hand, in the western region of the park prevails a humid climate that oscillates between the 9˚C - 11˚C. In the east of the hills of the Desierto de los Leones there is a cold subhumid and humid climate, which causes the temperature to drop to 6˚C. Presa de los Patos is located in the Desierto de los Leones National Park, in Mexico City. It has the geographic coordinates: latitude 19˚18'41.82"N, longitude 99˚18'35.06"W and approximate 2900 meters above sea level (Map 2).

2.2. Sample Collection

The water samples were collected during the winter. During the month of December of the year 2016, the Desierto de los Leones National Park realized Christmas events and different recreational activities, which caused a great amount of visitors to the Presa de los Patos. Water pollution was evident. For this reason it was decided to collect the samples during the month of January and carry out the analyzes already mentioned. They were collected from three different points along the place Presa de los Patos (the three sampling points were identified as high zone, middle zone and low zone). Two visits were made to the dam (with a week difference between each visit). A total of 18 samples were collected, each sample being approximately 3 liters.

2.3. Physico-Chemical Analysis

The physico-chemical parameters included the following tests: temperature (de-

Map 2. Geographiccoordinates of Presa de los Patos. Presa de los Patos: latitude 19˚18'41.82"N, longitude 99˚18'35.06"W. Source: SEDEMA-DGCORENA (Secretaría de Medio Ambiente-Dirección General de la Comisión de Recursos Naturales).

termined by using mercury in glass thermometer. The thermometer was rinsed with distilled water before and after each use, and the unit of measurement is centigrade degrees ˚C), pH (pH was determined by using a pH meter calibrated by inserting the probe in pH 4.0, 7.0 and 10.0. The probe was dipped into each water sample and the pH measurement recorded), turbidity (this was measured by simple comparison of the interference of light rays passing through each water sample with that of standard samples. The spectrophotometer was used after it has been calibrated by 5 and 10 NTU standards and the unit of measurement was NTU), conductivity (this was carried out using a conductivity bridge meter (multi-parameter). The probe was dipped into each water sample and the conductivity measurements recorded in μS・cm−1 (microsiemen per centimeter), solids (a clean and dry evaporating dish of known weight was used. It was filled with 100 cm3 of each water sample and evaporated to dryness in an oven at 102˚C - 105˚C to a constant weight), alkalinity (the 0.02 M H2SO4 was standardized with 0.02 M NaOH solution. About 100 cm3 of each water sample was taken and three drops of methyl orange indicator added which was titrated against standard H2SO4), chlorides (the 0.0282 M silver nitrate was standardized with 0.0282 M sodium chloride standard. About 100 cm3 of each water sample was taken into a conical flask and 1 cm3 of 5% potassium chromate indicator was added and titrated against standard silver nitrate solution), nitrates (the concentration of nitrates in a water sample was determined by measuring the absorbance in the ultraviolet range at 220 nm and comparing it with a calibration curve), chemical oxygen demand (COD) (the method is based on an energetic oxidation of organic matter and oxidizable inorganic matter found in water in a strongly acid medium with a titrated solution of potassium dichromate. The excess oxidizing agent is titrated with a titrated solution of ferrous ammoniumsulphate in the presence of a ferrous orthophenanthroline complex as an internal indicator), as described by NOM-127-SSA1-1994 and APHA.

2.4. Microbiological Analysis

The microbiological analysis included the following tests:

2.4.1. Determination of Total Coliform Bacteria and Fecal Coliforms

Fecal and total coliform counts were performed using the standard membrane filtration technique. The 100 ml water sample was filtered using 0.45 mm pore size, 47 mm diameter filter membrane as described by NOM-127-SSA1-1994 and APHA.

2.4.2. Isolation and Microbial Identification.

Microbial isolation was performed from the water samples collected at the place Presa de los Patos. The culture media used were: MacConkey agar, eosin methylene blue agar, Salmonella-Shigella agar and brilliant green agar. Isolation was performed by streak plate technique. The cultures were incubated at 37˚C overnight. After the incubation time, a new isolation was made in the same culture media and the morphology was analyzed to identify the bacterial genera.

2.5. Antimicrobial Susceptibility Testing

The disk diffusion susceptibility method was done as previously described [20] . The antibiotics used were ampicillin and ciprofloxacin, both antibiotics are commonly used in Mexico. The concentration of antibiotic used for the disks was 10 and 15 µg.

3. Results

3.1. Physico-Chemical Analysis

The temperature determination was performed at the same time as the sample collection. The average temperature of the three sampling points is shown in Table 1.

The pH determination was performed at the same time as the sample collection. The average temperature of the three sampling points is shown in Table 2.

The middle zone and the low zone did not meet the allowable limits in the turbidity test. The conductivity test showed that the three sampling points are within the allowable limits, however, the low zone had a high conductivity compared to the other zones. The three zones analyzed comply with the parameters established for the solid test. The average of the results is shown in Table 3.

The values of alkalinity, chlorides and nitrates were within the permissible limits. In the chemical oxygen demand test, the middle zone and the low zone had values well above those established. The results are shown in Table 4.

Table 1. Average temperature at all three sampling points.

The average temperature is similar in the three zones, however, in the low zone the temperature is around one degree lower than the other zones.

Table 2. Average pH at all three sampling points.

Table 3. Physico-chemical analysis results.

Allowable Limits: Turbidity (5 NTU), Conductivity (1200 μS/cm), Solids (500 mg/L).

Table 4. Physico-chemical analysis results.

Allowable limits: alkalinity (300 mg/L), chlorides (250 mg/L), nitrates (10 mg/L), chemical oxygen demand (2 mg/L).

3.2. Microbiological Analysis

3.2.1. Determination of Total Coliforms Bacteria and Fecal Coliforms

The results of the total and fecal coliform counts are shown in Table 5. The middle and low zones showed a high number of colony forming units.

3.2.2. Isolation and Microbial Identification

The culture media that were inoculated with the samples of water from the middle and low zones presented growth (Figure 1). Twelve different types of colony were isolated (Figure 2). Morphological analysis of the isolated colonies was performed, and five bacterial genera were identified (Table 6).

3.3. Antimicrobial Susceptibility Testing

Over 75% of the strains isolated showed inhibition against ciprofloxacin, while 90% showed resistance to ampicillin (Figure 3 and Figure 4). The results of the antimicrobial susceptibility testing are shown in Table 7.

4. Discussion

Water is an important natural resource on earth. It is necessary for all living organisms, ecological system, human health, food production and economic development. Water can be obtained from a number of sources, among which are streams, lakes, rivers, ponds, rain, springs [21] . Water is very essential to the survival of all organisms. The human body is composed of approximately 70% water by mass [22] . The water can be considered as the most important natural resource, because it is vital to life [23] . Fresh water has become a fundamental topic of debate around the world. There is no human activity with which water has no relation, and the problems around it are as diverse as its actors. In particular, Mexico suffers from major water problems of various kinds: infrastructure, conservation, financing, pollution, distribution, equity in access, management, as well as high vulnerability to global climate change [24] .

Mexico City is one of the most populated cities in the world. The Desierto de los Leones is a natural space that has propitiated the maintenance of the ecosystems that compose it, allowing the production of environmental goods and services on which the population of Mexico City depends directly. This area favors

Table 5. Total coliform bacteria and fecal coliforms.

Allowable limits: total coliform (0 CFU/100 ml), fecal coliforms (0 CFU/100 ml).

Table 6. Bacterial genera identified.

Five bacterial genera were identified.

Table 7. Antimicrobial susceptibility testing.

Without inhibition (−), low inhibition (+), middle inhibition (++), high inhibition (+++).

Figure 1. Colony growth in the different culture media. Colony growth was observed in the different culture media used.

Figure 2. Different types of isolated colony. Twelve different types of colonies were isolated.

Figure 3. Antimicrobial susceptibility testing. Ampicillin: 10 and 15 µg. Central Disk: Without Antibiotic. Ciprofloxacin: 10 and 15 µg.

Figure 4. Disk diffusion test. 1) Ampicillin10 µg, 2) Ampicillin 15 µg, 3) Ciprofloxacin 10 µg, 4) Ciprofloxacin 15 µg and 5) Negative control.

retention of moisture and recharge of the aquifer, prevents erosion, contributes to improving air quality, as well as to sustaining and improving populations of wild flora and fauna. In addition to its high biological value, the Desierto de los Leones plays an important role in the provision of recreational and recreational opportunities for the habitants of Mexico City [1] . Presa de los Patos is a place where families from Mexico City and visitors from other places can have recreational activities, practice sports, cook, celebrate special dates, etc. In the place we can find ducks that live permanently in the dam, for them, contact with humans is routine. There are rudimentary grills that visitors occupy to prepare their food, as well as around there are places where they can consume already prepared foods. However, most of these establishments discharge their wastewater directly to the dam. The drainage pipes are exposed on the surface, this can cause the rupture of some of them and that the discharge of waste water is distributed to several points of the dam. Visitors also contribute to the pollution of the place, because we find EPS plates (EPS: expanded polystyrene), plastic and EPS glasses, plastic spoons, bottles and cans of soda, paper napkins and food remains floating on the water. All of the above contributes greatly to the contamination of the dam’s water. The physico-chemical analysis carried out on the dam’s water included the following tests: temperature, pH, turbidity, conductivity, solids, alkalinity, chlorides, nitrates, chemical oxygen demand (COD) [18] [19] . The evaluation of physico-chemical analysis is of great importance in determining the factors that directly influence water quality. This type of analysis provides useful and specific data on the decomposition and intensity of contaminated wastewater or streams, for treatment, evaluation and prevention purposes [25] . As described by Tabbut (1999), the physico-chemical parameters that were determined at the site of the sample collection were the following: temperature, pH and conductivity [26] .

The temperature value is determined by the amount of solar energy absorbed by the mass of water and by the soil and air surrounding it, as well as by evaporation on its surface. High temperature values occur because of increased solar heating, but can also be caused by human activities that use water. Temperature plays a very important role in the biological balance and in the solubility of oxygen and mineral salts. The measurement of temperature in environmental samples must be a work done in situ, and therefore does not apply the procedures of storage and preservation. The best method for reading this parameter is to directly introduce the measuring equipment (thermometer or probe) into the water body [27] . The temperature of the three sampling points was in the range of 4.45˚C to 5.71˚C, water samples were collected during the month of January. The temperature values are lower than those reported by Taiwo et al. (2014) [2] and Mladinic et al. (1987) [28] in other rivers and lakes, this can be explained by the characteristics of this dam located at an altitude of approximately 2900 meters above sea level and the area has a temperature of 9 to 11˚C.

pH is a measure of the acidity or basic (alkaline) nature of a solution [29] . The middle zone and the low zone showed acid pH values (5.9 and 5.5, respectively). Low pH’s also increase the release of metals, some toxic, from soils and sediments [29] . According to the NOM-127-SSA1-1994, the pH of the drinking water should be between 6.5 - 8.5, the water of the dam does not meet the established. Our data is different from those reported by Romeu et al. (2012) [30] , Torres (2008) [31] , Geetha et al. (2014) [32] , Fatombi et al. (2012) [33] that came from another water bodies.

Turbidity in water is caused by suspending organic or inorganic material [25] . Solid particles suspended in water absorb or reflect light and cause the water to appear “cloudy”. These particles are suspended inorganic minerals or organic matter picked up over or under the ground [29] . According to the NOM-127- SSA1-1994, the turbidity limit of drinking water must be 5 NTU. The middle zone and the low zone did not comply with the turbidity limits, both presented higher values than those established (10.7 and 32.3 NTU). The major problem with turbidity is aesthetic, but in some cases suspended matter can carry pathogens with it [29] . Our data are similar to those reported by Taiwo et al. (2014) [2] , Karikari et al. (2006) [5] , Olorode et al. (2015) [9] , Shittu et al. (2008) [17] .

Conductivity is defined as the ability of a substance to carry electrons (electric current). In water, this capacity is influenced by the amount of dissolved salts and the temperature. This means that at higher salt content, higher conductivity. In this way, this property can be used to measure the content of salts in a sample of water (25). According to the NOM-127-SSA1-1994, the drinking water conductivity limit must be 1200 µS/cm. All three sampling points were below the limit. Our data are similar to those reported by Taiwo et al. (2014) [2] , Karikari et al. (2006) [5] , Olorode et al. (2015) [9] , Vázquez et al. [10] , Ladokun (2015) [13] , Shittu et al. (2008) [17] . The term “solids” refers to solid matter suspended or dissolved in water or waste. The solids can adversely affect water quality in several ways: high solids waters are less pleasing to human taste and may induce an unfavorable physiological reaction in the consumer. Highly mineralized waters are also unsuitable for many industrial applications, for these reasons, the limit of 500 mg/L of solids is desirable for drinking water. Highly mineralized waters are useless for many industrial applications; and those having high dissolved solids content may be aesthetically unsatisfactory for purposes such as bathing [18] [27] . All three sampling points were below the limit. Our data are similar to those reported by Taiwo et al. (2014) [2] , Karikari et al. (2006) [5] , Olorode et al. (2015) [9] , Vázquez et al. [10] , Shittu et al. (2008) [17] .

Alkalinity is the ability to react with the hydrogen ions of water, being mainly caused by the carbonate () and bicarbonate () ions, although it is also influenced by the content in others such as borates, phosphates, silicates and oxydriles [34] . The alkalinity is influenced by the pH, the general composition of the water, the temperature and the ionic strength [35] . According to the NOM- 127-SSA1-1994, the alkalinity limit for drinking water is 300 mg/L. The three zones evaluated showed values that did not exceed the allowed limits. Our data are above those reported by Taiwo et al. (2014) [2] , Karikari et al. (2006) [5] , Olorode et al. (2015) [9] , Vázquez et al. [10] , Ladokun et al. (2015) [13] . Excessive chloride concentration increases rates of corrosion of metals. Chloride is one of the major anion in water, and it is generally associated with sodium. High level of chloride ions may result in an objectionably salty taste [21] . According to NOM-127-SSA1-1994, the presence of chlorides in drinking water must be 250 mg/L as a limit. All evaluated areas showed acceptable values. Our data vary with those reported by Taiwo et al. (2014) [2] , Olorode et al. (2015) [9] , Shittu et al. (2008) [17] , Choudhury et al. (2016) [21] , Fatombi et al. (2012) [33] that came from different bodies of water.

The Nitrates () are very soluble salts, derived from nitrogen, which can be found in food and drinking water. They derive mainly from the use of nitrogen fertilizers, animal excreta, discharges from sanitary and industrial waste, and from the use as food additives (preserved fish and meat). If a water resource receives domestic wastewater discharges, nitrogen will be present as organic ammoniacal nitrogen, which, in contact with dissolved oxygen, will be transformed by oxidation into nitrites and nitrates. This nitrification process depends on the temperature, the dissolved oxygen content and the pH of the water [35] . According to NOM-127-SSA1-1994, the presence of nitrates in drinking water must be 10mg/L as a limit. All evaluated areas showed acceptable values. Our data vary with those reported by Taiwo et al. (2014) [2] , Karikari et al. (2006) [5] , Olorode et al. (2015) [9] , Choudhury et al. (2016) [21] , Fatombi et al. (2012) [33] .

COD is one of the most effective parameters in the control of water quality; constitutes the amount of chemical oxidant that is needed to be able to oxidize the materials contained in the water. Quantifies the amount of total organic matter susceptible to chemical oxidation (biodegradable and non-biodegradable) in a liquid sample and is used to establish the level of contamination [36] . According to the NOM-127-SSA1-1994, the permissible limit of the chemical oxygen demand test is 2 mg/L. The middle zone and the low zone presented values much greater than the established by the norm. Our data vary with those reported by Rajiv et al. (2012) [3] , Sood et al. (2008) [8] , Vázquez et al. [10] , Choudhury et al. (2016) [21] , Abdo et al. (2015) [26] .

The middle zone and the low zone did not meet with the limits established for the tests of pH, turbidity and chemical oxygen demand. pH is acidic, which can cause harm to the health of consumers. The water turbidity was evident, and the values obtained far exceed those established by the standards. The values of chemical oxygen demand showed that large amounts of oxygen are needed to oxidize organic matter. The rest of the physico-chemical tests showed values that do not exceed the established limits, however, the majority of the obtained values is very close to the allowed limits. Water is examined microbiologically to determine its sanitary quality and its suitability for general use. The aim being that it will be acceptable for internal consumption and other uses in contact with man. Water may contain poisonous chemical substances, pathogenic organisms (infectious and parasitic agents), industrial or other wastes or sewage and is referred to as being contaminated or polluted. Most of the infections in developing countries can be attributed to lack of safe drinking water (like cholera, typhoid, Hepatitis, Poliomyelitis etc.) [36] . The NOM-127-SSA1-1994 establishes that for drinking water, there should be no presence of coliforms and fecal coliforms. The middle zone and the low zone presented values much higher than those established. In both tests, the number of colony forming units ranged from 70 - 1000 CFU’s. Our data are congruent with those reported by Ohanu et al. (2012) [36] , Niewolak et al. (1999) [37] , Johnson et al. (2016) [38] , Hounsinou et al. (2015) [39] , Antony et al. (2012) [40] . The fecal contamination of water is a factor of sanitary importance because the feces contain a great variety of microorganisms, being able to contain even entero-pathogenic microorganisms like bacteria of the sort Salmonella, Shigella and Vibrio; Protozoa such as Entamoebahistolytica; Viruses such as enterovirus or hepatitis A [6] . The presence of E. coli in water is used as an indicator to monitor the possible presence of other harmful microbes such as Eryptosporidium giardia, Shigella and noro virus [2] . In this study, five bacterial genera (Escherichia coli, Klebsiella, Pseudomona, Salmonella and Shigella) were identified. Our results are consistent with those reported by Olorode et al. (2015) [9] , Omezuruike et al. (2008) [11] , Shittu et al. (2008) [17] , Choudhury et al. (2016) [21] , Lawal et al. (2011) [22] , Fatombi et al. (2012) [33] , Antony et al. (2012) [40] . Antimicrobial agents are classified by their specific modes of action against bacterial cells. These agents may interfere with cell wall synthesis, inhibit protein synthesis, interfere with nucleic acid synthesis or inhibit a metabolic pathway. The modes of action of antimicrobial agents against gram-positive and gram-negative bacteria are very similar [41] . Ciprofloxacin and ampicillin are two antibiotics commonly used in Mexico. For this reason they were used in the antimicrobial resistance test. Of the twelve isolates that were obtained, 90% were resistant to ampicillin, while 25% were resistant to ciprofloxacin. Our data are congruent with those obtained byMulla et al. (2016) [42] , Bosco et al. (2012) [43] , Krishnan et al. (2012) [44] , Falodun et al. (2016) [45] , Shatalov et al. (2015) [46] . There are a number of ways by which microorganisms are resistant to antimicrobial agents. These include: 1) the bacteria produce enzymes that either destroy the antimicrobial agent before it reaches its target or modify the drug so that it no longer is recognized by the target; 2) the cell wall becomes impermeable to the antimicrobial agent; 3) the target site is altered by mutation so that it no longer binds the antimicrobial agent; 4) the bacteria possess an efflux pump that expels the antimicrobial agent from the cell before it can reach its target; and 5) specific metabolic pathways in the bacteria are genetically altered so that the antimicrobial agent cannot exert an effect [41] .

5. Conclusion

The physico-chemical and microbiological analysis carried out at the Presa de los Patos in the Desierto de los Leones National Park showed that the water cannot be considered potable. Water does not meet physico-chemical and microbiological parameters, and they get worse in the low zone. Its consumption is a risk to the health of the residents and visitors. The microbiological analysis showed that the water is contaminated by bacteria that are highly dangerous for the human. In addition to these data, the major concern is in the resistance of bacteria to the antibiotics used. The diseases caused by the microorganisms identified in this study can cause serious damage to the population, especially the child population.

The Desierto de los Leones National Park has a large number of bodies of water, therefore, it is necessary to perform the same analysis in future work that can indicate the degree of water contamination. It will also be necessary to identify the species of the genera isolated in this study. The results of this study showed the degree of contamination of the Presa de los Patos during the month of January of the year 2017. Physico-chemical and microbiological analyses are necessary in each of the months to monitor the degree of contamination of the water in the different seasons of the year.

Acknowledgements

This work was carried out thanks to the collaboration of the “Consejo Asesorpara el Rescatedel Parque Nacional Desierto de los Leones”. Thanks to the staff and facilities of the Universidad Autónoma Metropolitana-Cuajimalpa. Thanks to the Vinculación Department of UAM-C.

Cite this paper

Gutiérrez-Lucas, L. , Chávez-Ramírez, L. and Arregui, L. (2017) Physico-Chemical and Microbiological Analysis of Water of the “Presa De Los Patos” in the Desierto De Los Leones National Park, Mexico. Advances in Biological Chemistry, 7, 122-138. doi: 10.4236/abc.2017.72008.

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