Determination of Cl, NH₄‐N and metals in the surface water of the Isumi river, Japan‐environmental effects caused by iodine factories

S. Mori Dept. of Agric. Cham., Fac. of Agric., The Univ. of Tokyo, Bunkyo‐ku, Tokyo, 113, Japan

H. Uchino Dept. of Agric. Cham., Fac. of Agric., The Univ. of Tokyo, Bunkyo‐ku, Tokyo, 113, Japan

Y. Dokiya Dept. of Agric. Cham., Fac. of Agric., The Univ. of Tokyo, Bunkyo‐ku, Tokyo, 113, Japan

E. Yoshimura Dept. of Agric. Cham., Fac. of Agric., The Univ. of Tokyo, Bunkyo‐ku, Tokyo, 113, Japan

S. Toda Dept. of Agric. Cham., Fac. of Agric., The Univ. of Tokyo, Bunkyo‐ku, Tokyo, 113, Japan

Y. Naruse Chiba Experimental Plantation, The Univ. of Tokyo, Awatsu‐kominato, Miwa‐gun, Chiba, Japan

Abstract

A repeated inspection survey was performed of the concentrations of Cl, NH₄‐N, Na, K, Mg, Ca, Fe, Cu and Mn in the surface water of the Isumi river, the longest river in Chiba prefecture, Japan. The sampling points were the places where the river water is introduced into the ricefields. The survey was continued from June, 1973 to Dec. 1977. It was found that the concentrations of Cl, NH₄‐N, Na, K, Mg and Ca were unusually high through the year but particularly in winter mainly owing to the waste water of two Iodine Factories situated up river.

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Determination of Cl, NH₄‐N and metals in the surface water of the Isumi river, Japan‐environmental effects caused by iodine factories

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Determination of Cl, NH4‐N and metals in the surface water of the Isumi river, Japan‐environmental effects caused by iodine factories

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Determination of Cl, NH₄‐N and metals in the surface water of the Isumi river, Japan‐environmental effects caused by iodine factories