チオシアン酸による鉱石中のモリブデンの光度定量

概要

論文の詳細を見る
Conditions for development of a stable coloration in the reaction of molybdenum with thiocyanate have been determined to obtain a rapid and accurate method for the determination of molybdenum in ores by the differential method. The sample is decomposed in nitric-, hydrochloric- and sulfuric acid, heated up to fuming, diluted with water and filtered. The filtrate is made up to a definite volume by water. An aliquot containing 1.92.7 mg of molybdenum is taken, 10 ml sulfuric acid added, heated up to white fumes and diluted to 60 ml with water. This is treated with 2 ml perchloric acid, 2 mg iron (III), 10 ml of 10% ammonium thiocyanate and 0.5 ml of 10% stannous chloride, and is made up to 100 ml. The light absorbance of the solution is measured at once through an S 47 light filter and the amount of molybdenum is calculated on the calibration curve.
社団法人日本分析化学会の論文