Abstract
Three methods for extracting trace heavy metals from soils have been compared. The methods were sodium carbonate fusion, extraction with hydrogen fluoride solution, and extraction by mixtures of nitric, sulfuric, and perchloric acids. Two artificial “soils” were used. “Soil A” was animal charcoal to which small amounts of Pb, Cu, and Cd had been added. “Soil B” was kieselguhr to which Pb, Cu, and Cd had again been added. The carbonate fusion gave low and erratic values in all samples. The other methods were more reliable. A modification to the usual three-acid extraction method is described. This is safer and quicker to use.
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