TITLE:
Zoning of Nitrite and Nitrate Concentration in Groundwater Using Geografic Information System (GIS), Case Study: Drinking Water Wells in Yazd City
AUTHORS:
Reza Ali Fallahzadeh, Seyed Ali Almodaresi, Mohamad Mehdi Dashti, Ahmad Fattahi, Mojtaba Sadeghnia, Hadi Eslami, Rasoul Khosravi, Roya Peirovi Minaee, Mahmoud Taghavi
KEYWORDS:
Drinking Water, Nitrite and Nitrate Concentration, Geographic Information Systems, Interpolation
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.4 No.3,
March
28,
2016
ABSTRACT: Studies
have demonstrated that the presence of nitrate and nitrite in drinking water
can cause some disease such as cancer and blu baby in the infant. The
Environmental Protection Agency (EPA) has since adopted the 10 mg/L standard as
the maximum contaminant level (MCL) for nitrate-nitrogen and 1 mg/L for
nitrite-nitrogen for regulated public water systems. Given the importance of nitrate
and nitrite in drinking water as well as GIS ability in spatial analysis of
various factors in the groundwater, this study aimed to evaluate concentration
of nitrate and nitrite in the drinking water wells of Yazd using two IDW
(Inverse Distance Weighting) and Kriging models. In this descriptive study, the
applied data on the water quality of underground water of Yazd Environmental
Health Office and the average annual nitrate and nitrite in 2015 were related
to 24 wells in the studied area. The nitrate and nitrite rate in groundwater in
wells was compared to the standard amount of Institute of Standard and
Industrial Researches and then was analyzed via Arc GIS software using IDW and
Kriging interpolation methods. The mean concentration of nitrate was 17.62 ± 3.08
mg/l and for nitrite was 0.011 ± 0.003 mg/l in the wells. In the all studied
zone, the nitrate and nitrite rate was in the standard range according to the
National Standard of Iran (No. 1053). In this study, Kriging interpolation
method was more efficient than IDW method.