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在微量钙的光度法测定方面已有评述。应用混合型配位络合物与阳离子表面活性剂反应形成多元络合物来测定微量钙,迄今尚未见有报导。本文系统地研究了钙-铬天青S-邻菲罗啉-溴化十六烷基三甲铵多元络合物的最佳形成条件,试验了大多数常见离子的干扰情况,测定了络合物的组成及摩尔吸光系数,并用所建立方法用于硅铁中微量钙的测定,获得较满意的结果。实验部分 1.试剂与仪器:钙标准溶液:取基准碳酸钙配制成1×10~(-3)M溶液,然后再配制成
In the determination of trace calcium spectrophotometry has been reviewed. The use of mixed coordination complexes with cationic surfactants to form multiple complexes to measure trace calcium has not been reported yet. In this paper, the optimum conditions for the formation of calcium-chromium azure S-o-phenanthroline-cetyltrimethylammonium bromide complex were systematically investigated. The interference of most common ions was tested. The complex Composition and molar absorption coefficient, and the established method for the determination of trace amounts of ferrosilicon in ferrosilicon to obtain more satisfactory results. Experimental part 1. Reagents and equipment: Calcium standard solution: Take the reference calcium carbonate formulated into 1 × 10 ~ (-3) M solution, and then formulated into