Compairative Study of Heavy Metals Concentration in Water Collected from Different Sewage Irrigated Fields around Bikaner city

摘要

In this study, the effect of sewage water irrigation was assessed at 5 agricultural sites around Bikaner city, Rajasthan, India. Variation in heavy metals concentration in sewage water samples were studied during the pre monsoon and post monsoon period in year 2016. Twenty eight water samples were collected from Chandmal baag, Sujandesar, Kadari colony (Shriramsar), Kocharo ka bhaththa (Gangashahar-Bhinasar) and Gharsisar in the month of may-june and october-november. Heavy metals concentrations (like Fe, Zn, Mn, Cu, Cd, Cr, Ni, As and Pb) were determined using atomic absorption spectrophotometer (AAS). The results were compaired with the World Health Organization (WHO) values. The experimental results indicated the presence of heavy metals in sewage water samples and hence refered metal contamination. This concentration of metals is high enough to be accumulated in soils. The t-test was conducted and a drastic decrease in all heavy metals concentration in post monsoon season was recorded. Results also shows that the content of heavy metals in pre monsoon season is higher than the permissible limit of WHO and the content of heavy metals in post monsoon season is less than the permissible limit of WHO. These results suggested that this sewage water has significant health implications for both consumers and farmers and hence, proper health education is essential for women and men who are in contact with sewage during farming and should be treated before use.