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Extractability of metals applied to soils in sewage effluent



Extractability of metals applied to soils in sewage effluent



Soil Science 138(6): 423-435



Municipal sewage plant effluents containing heavy metals are increasingly being used for or disposed of by irrigation. The forms of the metals added to the soil may differ from those of indigenous metals, thus making them more or less available to vegetation. This study was undertaken to determine the extractability of metals in soils after repeated effluent applications. Secondarily treated sewage effluent spiked with Cd, Cu, Ni, Pb and Zn was applied weekly of 4 diverse soils for 1 yr. soil samples were taken periodically and analyzed for DTPA [diethylenetriaminepentaacetic acid]. H2O, NH4OAc [Ammonium acetate], H2O2 and HNO3-HF-extractable metals. Initially, < 1 mg/kg of the indigenous metals was extractable by H2O, NH4OAc, or H2O2. After 1 yr of effluent application, < 5 mg/kg of each of these metals was extracted from the surface 0-2.5-cm soil samples, using 1 or more of these extractants. Increases in the fraction of the total soil metals that were DTPA-extractable were found in 3 of the 4 soils studied, indicating that metals applied in effluents of these soils may be more avialble to plants than the indigenous metals. Of the metals studied, Cd had the largest DTPA-extractable portion, indicating the potential for increased vegetative Cd uptake from soils to which effluent containing Cd had been applied.

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Accession: 001364886

Download citation: RISBibTeXText

DOI: 10.1097/00010694-198412000-00006


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