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ASSESSMENT OF NITRATE LEVELS IN DUG WATER SOURCES AND SELECTED FOODS IN SOKOTO, SOKOTO STATE
Hassan A. B, Afolaya O. O & Adegboye Y.

ABSTRACT
A study of the concentration of nitrate in underground waters and foods was conducted in Sokoto metropolis of Sokoto State between April and June 2016. A total of 10 underground water points (six boreholes and four dug wells) and three types of food were sampled. The samples were collected and analyzed using phenoldisulphonic acid method for water analysis and modified micro Kjeldahl methods for foods. The depth of the boreholes and dug wells were obtained from the locations, and they varied in depth from 15.35 to 58.40 meters. The distance from pollution sources of nitrates varied between 8.00 to 15.40 meters. The results showed that the average nitrate values of dug wells ranged from 21.9mg/I to 36.5mg/I while the boreholes ranged from 14.0mg/I to 21.3mg/I. However, these values did not exceed the World Health Organisation (WHO) normal value of 45mg/I for nitrate (NO3) or 10mg/I for Nitrate-Nitrogen. There are statistically significant correlations between nitrate values and (a) depth of dug wells and boreholes and (b) distance of dug wells and boreholes from the septic tank. Of the three types of food (Green beans, Garbage, and Carrot) studied, green beans had the highest nitrate value of 0.98/100g and carrot has the least value of 0.1/100g. The public health implications of nitrates in waters and foods are discussed.


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The Beam journal of arts and science
ISSN: 1118-5953 www.uaspolysok.edu.ng/jounal