Spatial distribution of heavy metals in sewage irrigated peri-urban area of Mohindergarh and Narnaul cities
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Date
2019
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CCSHAU
Abstract
A field survey and laboratory study on “Spatial distribution of heavy metals in sewage irrigated peri -urban area of Mohindergarh and Narnaul cities” was conducted during 2018-19 to investigate the effects of sewage water on physical and chemical properties of soil. In this study, soil, water and vegetables/crops samples using GPS were collected from peri-urban area of Mohindergarh and Narnaul cities by following random sampling method and analyzed for physico-chemical properties, DTPA extractable and total heavy metals uptake, total phenolic content and quality parameters in respective samples. In soil, chemical properties like EC, OC and CEC found to be higher in sewage irrigated soils compared to tube well irrigated whereas pH and CaCO3 higher in tube well irrigated than sewage irrigated soils of the study area and DTPA extractable Zn content was higher followed by Cu> Pb> Ni> Cr> Co> Cd in sewage irrigated soils than tube well irrigated soils and found within the permissible limit. Heavy metals followed the decreasing trend with increasing depth in soil profiles of both the cities in both soils except Ni. In different plant samples, Zn got maximum accumulation followed by Pb than other heavy metals in both sewage and tube well irrigated soils except spinach and all the heavy metals were found within the permissible limit except Cr at some sites in cabbage, brinjal and okra. In sewage and tube well water samples, Zn and Cu were detected out of which Zn found in higher concentration and rest of the metals not detected. Total phenols content in sewage and tube well waters of Mohindergarh ranged from 13.2 to 22.8 and 2.4 to 7.2, respectively and in samples of Narnaul ranged from 20.4 to 39.6 and 2.4 to 9.6, respectively. With the help of Pearson’s correlation coefficient, the relationship of different physico-chemical properties with micronutrients and heavy metals contents in soil were determined and found that negative correlation between pH and all heavy metals, significant positive correlation between pH and CEC; EC with CEC and clay content; clay with EC, OC, CEC and silt content; Co with silt content, Cu, Cr, Pb and Ni.