偶氮氯膦-mA分光光度法测定钢中的稀土总量

Determination of Total Rare Earths in Steel with Chlorophosphonazo mA Spectrophotometry

本文提出在大量铁存在时用ＥＤＴＡ做隐蔽剂，选择６５８ｎｍ波长，用偶氮氯膦－ｍＡ（ＣＰＡ－ｍＡ）分光光度法直接测定钢中的稀土总量。在试验条件下，偶氮氯膦－ｍＡ与各等量的单一稀土配合物的吸光度基本接近。此时，各等量稀土配合物之间吸光度的差别也大大小于用草酸做隐蔽剂时的差别。从而减小了由于试样中各稀土元素的配分未知而引起的测定误差。

A direct determination of total rare earths in steel with chlorophosphonazo mA spectrophotometry has been improved by taking EDTA as masking reagent and 658nm wavelength.The absorbance difference of each equivalant amount of rare earth complex far smaller than that of oxalic acid when used as masking reagent under the conditions of experiment,hence the measuring errors by each unknown rare earth proportion were decreased.