硫·硝酸分解抽出法による底質試料の全リン分析とその岩石試料への適用

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The concentration of total phosphorus in sandy and muddy bottom sediment were studied by using two kinds of procedures, the H2SO4-HNO3 digestion and the HF-HNO3 digestion. The recovery ratio of the H2SO4-HNO3 digestion procedure to the HF-HNO3 digestion procedure was between 90% and 101% and the mean value was 97%. The analitic accuracy of the H2SO4-HNO3 digestion procedure based up on the coefficient of variation was between 0.3% and 1.4%.There were no recongnizable differences of values between ground and unground samples in the H2SO4-HNO3 digestion procedure. It was necessary to use a watch glass to prevent a loss of phosphorus during the evaporation of sulfric acid due to heating.These procedures were also used for other kinds of rock samples such as basalt, andesite, rhyo-dacite welded tuff, sandstone etc. The recovery ratio of the H2SO4-HNO3 digestion procedure to the HF-HNO3 digestion procedure was between 79% and 104% (mean : 94%). These results suggested that the H2SO4-HNO3 digestion procedure was useful as an extraction procedure for measuring total phosphorus of bottom sediment and was applicable to rock samples.
社団法人　日本水環境学会の論文