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试样用稀酸分解,用EDTA二乙酯掩蔽铁及其它干扰元素,在pH2.8左右,直接用偶氮胂Ⅲ或双羧基偶氮胂Ⅲ显色,光度法测定钇基球铁中希土总量。然后另取一份溶液以1,2-环己烷二胺四乙酸(DCTA)掩蔽重希土,同样用上述显色剂光度法测定轻希土分量。差减法求出重希土分量。方法适合不同轻重希土配比的钇基球铁的测定。
The sample is decomposed with dilute acid and the iron and other interfering elements are masked with diethyl ether of EDTA. The chromogenic and spectrophotometric determination of yttrium-based ductile iron directly by arsenazo Ⅲ or dicarboxyarsenazo Ⅲ at a pH of about 2.8 Total soil. Then another solution was taken to cover heavy rare earth with 1,2-cyclohexanediaminetetraacetic acid (DCTA), and then the eutectic soil component was also measured with the above reagent photometry. Subtraction method to find the weight of heavy soil. The method is suitable for the determination of yttrium-based ductile iron with different proportions of light and heavy mixture