TITLE:
Trace Metal Elements (Pb, Cd and As), 15N Nitrogen and Phosphorus Isotopes Accumulation in Three Varieties of Tomato from Conventional and Agro-Ecological Farming Systems in Burkina Faso
AUTHORS:
Christophe Dabiré, Abdoulaye Sérémé, Hermann Panandtigri, Abdoudramane Sanou, W. D. B. Aimée Guissou, Mamoudou H. Dicko
KEYWORDS:
Tomato, Metal Trace, Farming Practices
JOURNAL NAME:
Food and Nutrition Sciences,
Vol.12 No.2,
February
26,
2021
ABSTRACT: Tomato
is a market gardening product that plays an important nutritional and economic
role in Burkina Faso. However, the bad use of pesticides for its production
could have negative impacts consumers’ health. The objective of the present study was to assess the concentration of
trace metal elements (Pb, Cd and As), 15N
isotopes (NO2-, NO3-, NH4+) and
phosphorus (PO42-) in
tomatoes according to cultivation practices. Thus, three tomato varieties (Mongal F1, F1 Cobra 26 and Roma F1) were grown using organic and conventional production methods on 2
sites at Nongr Massom, (commune of Kadiogo province). The trace metal elements
were analyzed using atomic absorption spectrophotometry, the isotopes 15N (NO2-, NO3-, NH4+) and
phosphorus (PO43-) using
standardized methods. Tomatoes from conventional agriculture had higher levels
of trace metal elements (0.163 - 0.298 mg/Kg, 0.082 - 0.146 mg/Kg and 0.018 - 0.032 mg/Kg respectively
for Pb, Cd and As) than those from
organic agriculture samples. Concentration of trace metal is lower for organic production with a reduction of 19.02%, 19.69% and 20.77% for Pb, Cd and As respectively compared to conventional production. High
levels were recorded for the Roma F1 variety. The concentrations of trace metal
elements in organic production are lower than the codex standards (2010) while
those in conventional production are higher. These results could be due to the
use of chemical inputs that could have a
negative impact on the nutritional quality of these tomatoes. The
concentration of trace metal elements in tomato fruits is strongly correlated
by production method and less by the variety (genetic).