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分光光度法测定微量钡的报导不多,且方法的灵敏度低,选择性大都不好,偶氮磺Ⅲ在pH2.6—7.7可与锶、钡反应,但选择性不佳,未见用于实际样品分析。DBC-偶氮氯膦(以下简称DBC-CPA)是测定稀土元素的新显色剂,我们发现它在高酸度下能与钡生成灵敏的紫色配合物,反应的灵敏度高,用双波长法测定时可消除大量钙的干扰,且等量的钡和锶的△A相等,可方便地测定钡、锶合量,三十余种其它离子允许存在较大量。本法用于多种化学试剂及孕育剂等样品中钡(锶)的测定获得较好结果,方法简便、快速。
Spectrophotometric determination of trace amounts of barium reported little, and the method of low sensitivity, selectivity is not good, azo sulfur Ⅲ at pH2.6-7.7 with strontium, barium reaction, but poor selectivity, not used in Actual sample analysis. DBC-chlorophosphonazo (hereinafter referred to as DBC-CPA) is a new chromogenic reagent for the determination of rare earth elements. We found that it can form sensitive purple complex with barium under high acidity. The sensitivity of the reaction is high. Can eliminate a large amount of calcium interference, and the same amount of barium and strontium △ A equal, can easily determine the amount of barium, strontium, more than thirty kinds of other ions allows a larger amount. This method is used for a variety of chemical reagents and inoculants and other samples of barium (strontium) determination of better results, the method is simple and fast.