The Bioavailability and Risk Potential of Copper and Zinc of Soil as An Indicator Heavy Metals Contamination in The Aquatic System in Sumber Nyolo, Karangploso, East Java
Journal of Pure and Applied Chemistry Research
The bioavailability potential of heavy metals in the soil can be used as an indicator of heavy metals pollution in an aquatic system. Soil samples were collected from five sites at the upper and downstream of the Sumber Nyolo by using grab sampling. Samples were pretreated before metals analysis. Geochemical fractions of Cu and Zn were extracted using the Community Bureau of Reference (BCR) modified technique and followed by Cu and Zn analysis using Atomic Absorption Spectroscopy. Based on
... copy. Based on percent distribution, Cu was dominant in the form of a resistant fraction (F4) (57%), while Zn was dominant as a nonresistant fraction (F1, F2, and F3) (59). As the first fraction (F1) that is referred as the bioavailable fraction, Cu (13%) was more potentially released from soil to water body than Zn (4%), thus Cu was more bioavailable. Based on correlation with physical-chemical properties of soil, Cu and Zn will be released when there is increasing of soil redox potential, increasing of cation exchange capacity and changes of pH to an acid condition. Furthermore, the Risk Assessment Code value for Cu and Zn in soil from Sumber Nyolo were 0.13% and 0.04%, respectively. This indicated that soil in Sumber Nyolo has no potential in providing Cu and Zn in the water body. Thus, physical-chemical properties of soil can be used as indicators of availability of heavy metals in a water body.