摘要
ｐＨ＝２．０的Ｈ２ＳＯ４介质中，钴（Ⅱ）对ＫＩＯ４和Ｈ２Ｏ２氧化中性红（ＮＲ）的褪色反应有明显的催化作用，据此建立了测定痕量钴（Ⅱ）的催化动力学光度法，可测定２×１０－８～４×１０－７ｇ／ｍｌ的钴（Ⅱ），检出限为５×１０－９ｇ／ｍｌ。用于维生素Ｂ１２中钴的测定，获得满意的分析结果。
A method has been studied in this paper for the determination of trace cobalt(Ⅱ). According to the method, trace cobalt(Ⅱ ) in sulfuric acid solution (pH = 2. 0) may catalyze the discoloring oxidation reaction of neutral red by KIO4 and hydrogen peroxide. The new method for determination of trace cobalt has been developed. The linear range is 2 × 10-8 ～ 4 ×10-7g/ml and limit of detection is 1 ×10-8g/ml. This method has been applied to the determination of cobalt in the vitmine B12 with satisfactory result.
出处
《延安大学学报（自然科学版）》
1994年第4期42-44,6,共4页
Journal of Yan'an University：Natural Science Edition
关键词
动力学光度法
钴
催化光度法
测定
Catalytic reaction
Kinetic spectrophotometry
cobalt determination
neutral red.
