The analysis was made by using the data at 100 stations in the rivers of Kumamoto Pref., for the purpose of supporting the validity of the benthic fauna as the indicator of water quality.
The principal component analysis was made by six factors of water quality (BOD, COD, C_l-, NH4-N, T-N, T-P). In consequence, the first principal component (Z₁W) showed the pollution. Though the correlation coefficient between Z₁W and PI(N) is relatively good with γ=0.804, there is the case that the value of PI (N) is evaluated β-ms in spite that Z₁W judges it very clear. The reason is that the water areas of β-ms contains “very clear water area” and “clear waterarea”.
Accordingly, the values of new five grades of water quality (Q) and the method of biological evaluation of water quality (BE) were tested. The correlation coefficient between the values of BE using Q and Z₁W is good with γ=0.833. The difference between “very clear water area” and “clear water area” was evaluated.

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This investigation was undertaken in order to establish a suitable method for a simultaneous determination of pesticides in environmental samples using capillary gas chromatographic-mass spectormetry (GC/MS). In this paper, the basic sets of data obtained by the examination of unit procedure including retention indexes (PTRI) on the three capillary columns, response factors vs. anthracene-d₁₀ as a internal standard and their coefficients of variation, recoveries on pretreatment of GC/MS analysis, adsorption on polyethylene or glass bottle, degradation during storage in darkness at 4°C, and octanol/water partition coefficients were provided and discussed. The linear relationship was observed in the PTRIs between Ultra-1 and Ultra-2 among 129 pesticides (r=0.999). Relative standard deviations for injection of standard solution using six internal standards were almost less thas 10%. Excellent extraction recoveries with dichloromethan were obtained for the pesticides investigated.

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[in Japanese]

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[in Japanese]

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