市販特級モリブデン酸ナトリウムにみられたタングステンの混在と,リン定量への妨害
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概要
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In carrying out the determination of phosphate in serum phospholipids by molydbenum blue spectrophotometry, the authors happened to meet an "impure" sodium molybdate of G. R. grade, which involved about 0.05% of tungsten {W (VI)}. Using this impure reagent, the color development of molybdenum blue was remarkably retarded with a shift of maximum absorption wavelengths. The magnitude of this influence varied with standard phosphate solution and with the lipid extract from serum samples, hence it resulted in maximum 30% negative errors.<BR>The presence of tungsten in sodium molybdate and its unfavorable influence was acertained by emission spectroscopy and addition test of tungsten as WO<SUB>4</SUB><SUP>2+</SUP>, respectively.
- 社団法人 日本分析化学会の論文