光度法快速测定水泥中Fe2O3

Quickly Determination of Fe2O3 in Cement by Spectrophotometry

在pH2左右的条件下，磺基水扬酸能与三价铁形成红紫色稳定的络合物，最大吸收波长为510nm，表观摩尔吸光系数为1．87×10^3L·mol^-1·cm^-1。本文研究了显色体系，并确定了反应的最佳条件，提出了用磺基水扬酸分光光度法测定水泥中三氧化二铁的方法，测定结果与认定值相符，其相对标准偏差（RSD）小于2％。

In the conditions around pH 2, Fe^3＋ reacts with sulphosalicylic acid to form a red and purple complex which exhibits an absorption maximum at 510 nm with a apparent molar absorptivity of 1.87×10^3L·mol^-1·cm^-1. This paper studies the colour--display system, and the optimal reaction conditions are established. In the application of this method to the direct determination of Fe^3＋ in cement , the results are constent with the certified. The RSD （n=5） is not more than 2%.