释放螯合滴定法测定钼铁中的铁含量

RELEASED CHELATOMETRY DETERMINATION OF IRON IN FERROMOLYBD-ENUM

用NH4SCN、(C4H9) 4NCl为释放剂 ,选择性螯合滴定法测定钼铁中的铁。先用EDTA螯合Fe3+和其他阳离子 ,然后加入NH4SCN和 (C4H9) 4NCl,分解Fe -EDTA螯合物、释放出的EDTA ,用In(NO3) 3标准溶液返滴定 ,而Fe3+形成 [(C4H9) 4N]3[Fe(SCN) 6 ]缔合物。实验结果表明 ,一般常见阳离子完全不干扰测定铁 ,该法已成功地用于测定钼铁中的铁含量。

The NH 4SCN and (C 4H 9) 4NCl is used as releasing agent for the determination of iron in ferromolybdenum with selective chelatometry.Fe 3+ and other cations are chelated by EDTA,NH 4SCN and (C 4H 9) 4NCl is then added to decompose the Fe-EDTA chelates and the liberated EDTA is back-titrated with In(NO 3) 3 standard the Fe 3+ forms a [(C 4H 9) 4N] 3[Fe(SCN) 6] association compound.Experimental results show that the cation has no influence to interference of iron.This method has been successfully applied to determination of iron content in ferromolybdenum.