Trace elements content in sewage water and industrial effluents used soils of northern India

摘要

Seventy three surface soil samples were collected from Haryana state, Northern India, primarily representing sewage water and industrial effluents used soils. Soil pH varied from 6.9 to 8.7, EC from 0.24 to 4.20dS·m<'-1> and organic carbon content from 0.30 to 2.90 percent with an average value of 0.86 percent. The CaCO<,3> content ranged from traces to 9.4 percent with a mean value 2.11 percent. The DTPA extractable Co, Cu, Fe, Mn, Pb and Zn in soil samples, varied from 0.05 to 0.99, 1.40 to 63.15, 3.54 to 98.77, 1.25 to 18.72, 0.70 to 25.93 and 0.55 to 17.50mg·kg<'-1> with the corresponding mean values of 0.27, 11.97, 26.26, 9.13, 6.26 and 9.48mg·kg<'-1>, respectively. The sewage waters must be analysed for their chemical composition before their use for irrigation purposes, because their composition depend upon the source of industrial effluents discharged into domestic sewer. There is a need for periodic assessment of build-up of the trace elements in agricultural soils using sewage waters for irrigation as these soils pose a greater risks when vegetables and fodder crop grown on metal polluted soils form a significant part of human and animals diet specially in most of the developing countries of the world.