Critical pollution value of heavy metals contained in river sediments.
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概要
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There are various means of determining the heavy metal critical pollution point of river sediments. This study presents a method for determining a critical point of pollution by using the quantities :<BR><I>T</I>=_??__??_σ<SUP>jj'</SUP> log<SUB>10</SUB>(<I>a</I>+<I>by<SUB>j</SUB></I>) log<SUB>10</SUB>(<I>a</I>+<I>by<SUB>j'</SUB></I>)<BR>where, the suffixes <I>j</I> and <I>j</I>' correspond to the <I>j</I>-th and <I>j</I>'-th metals, respectively, the <I>n</I>×<I>n</I> matrix [σ<SUP>jj'</SUP>] is the inverse of the population variance-covariance matrix of <I>n</I> heavy metals in upstream rivers, and a and b are the arbitrary constants. <I>y<SUB>j</SUB></I> denotes the average of m independent measurements of the concentration of the j-th metal of the typical downstream river. Values of log<SUB>10</SUB> (<I>a</I>+<I>by<SUB>j</SUB></I>) are regarded as being distributed as <I>N</I> (μ, ∑), and hence <I>T</I> follows a noncentral chi-square distribution. Using PEARSON'S approximation for a central chi-square distribution, a critical pollution point is obtained. Application to first class rivers in Japan showed a qualitative comparison of the intensity of pollution.
- 日本陸水学会の論文
日本陸水学会 | 論文
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