Abstract
How to set up a standard method for judging as to whether or not river sediment is polluted by heavy metal is essential to the definition of polluted sediments. In a previous report, the authors proposed a pollution index to determine the degree of pollution and how it was applied to the sediment of first class rivers in Japan. The fundamental philosophy of this method is based on the statistical idea that the upper 10% of the distribution formed by the normalized group of upstream sediment falls within the critical region. In this case the distribution of pollution indices must be normal. In the present paper they propose a new pollution index, which is distributed as noncentral chi-square in most of the cases of practical application.
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