自動車排ガス中のリン(III),(V)および有機リン化合物の定量

概要

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The method for the determination of phosphorus (III) and (V), and mixtures of organic phosphorus in automobile exhaust was studied. In order to determine phosphorus by the colorimetry with molybdenum blue, it should be in the orthophosphate state. Both phosphorus(III) and organic phosphorus can be oxidized quantitatively to this state with ammonium persulfate in hydrochloric acid; thus, the three types of phosphorus may possibly be determined as the orthophosphate. The organic phosphorus compounds in the presence of the inorganic phosphorus compounds were extracted into ethyl acetate, the phosphorus(III) remained in the aqueous phase was oxidized and the sum of the phosphorus(III) and (V) was determined as orthophosphate.<BR>By determing the orthophosphate contents in three aliquots taken from the sample, the amounts of the three forms of phosphorus can be calculated from the differences of the values obtained: 1) without oxidation, 2) by oxidation with ammonium persulfate in hydrochloric acid and 3) by oxidation of the phosphorus (III) after the extraction of the organic phosphorus.
社団法人日本分析化学会の論文