BF_4-メチレン青錯塩による鋼中の微量ボロンの抽出吸光光度定量

概要

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A simple spectrophotometric method is described for the determination of microamount of boron in various steels by solvent extraction with tetrafluoroborate-methyleneblue complex. The procedure is as follows : Dissolve 1g of the sample in 20 ml of HNO_3 (1 : 1) or 20 ml of aqua regia, add 15 ml of H_2SO_4 (1 : 1) and 15 ml of H_3PO_4 (1 : 1), evaporate to fumes of H_2SO_4, cool, and dilute to 250 ml with water. Transfer 25 ml of the solution to separatory funnel, add 10 ml of water and 5 ml of HF (5%) and let stand for 1 hr. Add 20 ml of water, 2 ml of methyleneblue solution (0.001M) and 25 ml of dichloroethane, and shake for 1 min. Let stand for 5 min to allow the layers to separate. Filter the dichloroethane solution through a dry filter paper in to a dry absorption cell. Measure the absorbance against blank solution at 660mμ. The procedure needs less time than any other methods reported in the past literature.
社団法人日本鉄鋼協会の論文
1970-05-01