関東地方の主要三河川,利根川,荒川,那珂川の河川水中のカドミウム,亜鉛,および銅濃度分析の一例

抄録

Cadmium, zinc and copper levels were investigated for running water in head, middle and lower reaches of the three major rivers, TONEGAWA, ARAKAWA and NAKAGAWA, in KANTO district. Cadmium and zinc concentrations were deter mined for filtrate and residue with 0.45pm membrane filter. Copper was determined for filtrate of water with and without acid amendment . Soluble cadmium ranged 0.008-0.043 in the river heads and shifted up to 0.030-0.091μg/l in the lower reaches. Soluble zinc ranged 1 .2.4.3 in the river heads and 5.1-18.4μg/l in the lower reaches. Suspended cadmium and zinc levels were compa rable with those of the soluble forms . Soluble copper with acid amendment ranged 1.80-4.76 in the river heads and apparently increased up to 6.50-17.7μg/l in the lower reaches. The levels of metals in the river heads may represent the natural abundance, and the background levels may be defined from those in the middle and lower reaches of the rivers.