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过去测定钢铁中的稀上,采用甲基异丁酮萃取分离基体铁等干扰元素,然后用偶氮胂Ⅲ比色测定。该法操作繁琐,流程冗长,且有机试剂污染环境,有碍分析人员的健康。为此,我们对偶氮氯膦Ⅲ直接光度法测定钢铁中的稀土进行了试验。偶氮氯膦Ⅲ在pH=l左右与稀土元素显色反应具有相当高的选择性,可免除许多离子干扰;另一方面许多阴离子如
In the past, the determination of iron in the dilute, the use of methyl isobutyl ketone extraction matrix iron and other interference elements, and then arsenazo Ⅲ colorimetric determination. The method is cumbersome to operate, the process is lengthy, and the organic reagents pollute the environment, impeding the analysis of the health of personnel. To this end, we conducted a direct spectrophotometric determination of rare earths in steel with chlorophosphonazo III. Chlorophosphonazo III at pH = 1 or so with the rare earth element chromogenic reaction has a very high selectivity, and can be immune to many ion interference; the other hand, many anionic