炭酸カルシウムへの微量リンの共沈濃縮(<特集>超微量分析のための前処理と予備濃縮)

概要

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The spectrophotometric determination of trace phosphate ion in natural water after enrichment by coprecipitation with calcium carbonate has been studied. Coprecipitation procedure was as follows : To a 500 cm^3 of water sample, each 10cm^3 of 2 M (M=mol dm^<-3>) sodium hydroxide and 2 M sodium carbonate and then 10 cm^3 of 2 M calcium chloride were added with continuous agitation. The resulting precipitation was separated with a 0.45 μmφ membrane filter, and dissolved in 8.0 cm^3 of 6 M hydrochloric acid. Phosphate ion in the solution was determined spectrophotometrically with the conventional Molybdenum Blue method. Enrichment factor obtained by the established method was 50, and more than 9.6 μg dm^<-3> of PO_4^<3-> in a water sample, which corresponds to the absorbance 0.1 (1 cm cell), could be determined accurately.
社団法人日本分析化学会の論文
1987-11-05