Abstract
The experimental conditions for the extraction of heavy metals by diluted hydrochloric acid were examined with mud samples of some rivers receiving effluents from industries and municipalities. The shaking of dry mud with 0.5N HCl for one hour at 37°C gave the most reproducible results, and so this condition was adopted for determining the amount of extractable heavy metals in mud samples taken from the Oi, Sagami, Tama and Tsurumi Rivers. The mud of the Oi River was found to contain less extractable heavy metals than other rivers, and the difference in sampling points was not significant. The amount in terms of the respective metal was about 2 ppm of Ni, 6 ppm of Cu and Pb, and 10 ppm of Zn; Cr and Cd were not detected.The mud samples in the lower stream of the Tama and Tsurumi Rivers contained 10 to 50 times more extractable heavy metals than in other points of the same rivers. There was good correlation between the ignition loss of mud samples and the amounts of extractable heavy metals. A greater extraction rate (extractable amount/total) occurred in the lower reaches of the Tama and Tsurumi Rivers.
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Schedule a callMore From: Japanese Journal of Limnology (Rikusuigaku Zasshi)
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