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- W2322248483 abstract "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 :T=_??__??_σjj' log10(a+byj) log10(a+byj')where, the suffixes j and j' correspond to the j-th and j'-th metals, respectively, the n×n matrix [σjj'] is the inverse of the population variance-covariance matrix of n heavy metals in upstream rivers, and a and b are the arbitrary constants. yj denotes the average of m independent measurements of the concentration of the j-th metal of the typical downstream river. Values of log10 (a+byj) are regarded as being distributed as N (μ, ∑), and hence T 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." @default.
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- W2322248483 date "1986-01-01" @default.
- W2322248483 modified "2023-10-16" @default.
- W2322248483 title "Critical pollution value of heavy metals contained in river sediments." @default.
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- W2322248483 doi "https://doi.org/10.3739/rikusui.47.1" @default.
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