ホルムアミド-酒石酸によるセレン(IV)の重量分析

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Selenium (IV) is quantitatively reduced and precipitated as metallic form in the formamide solution containing hydrochloric acid after heating into boiling water bath. Twenty to four hundred mg of selenium can be determined gravimetrically by the presented procedure. Tartaric acid was used together with formamide to mask tellurium and other diverse ions. The recommended procedure is as follows ; Take an aliquot of the sample solution containing Se(IV) (≦400 mg) in a 100 ml beaker. Evaporate the solution up to dryness on a water bath after addition of nitric acid. Add 4 ml of hydrochloric acid and 20 ml of formamide, transfer the solution into a 100 ml Erlenmeyer flask with stopper containing 1g of tartaric acid, and heat 1.5 hours into boiling water bath. Filter the precipitated selenium through a sintered glass filter, wash, dry at 100℃, and weigh the precipitate. The effect of ten-odd cations and some anions on the determination was also examined. The determination of Se(IV) was interfered seriously with Hg(II).
社団法人日本分析化学会の論文
1977-11-05