同时测定重油中铁和锌的正三辛胺萃取-双波长K系数分光光度法

Simultaneous Determination of Iron and Zinc in Heavy Oil by Double Wavelength K _Coefficient Spectrophotometry with Trioctylamine Extraction

用正三辛胺萃取分离干扰离子，以Ｆｅ２＋（Ｚｎ２＋）－５＿Ｂｒ＿ＰＡＤＡＰ（２－（５－溴－２－吡啶偶氮）－５－二乙基氨基苯酚）－ＴｒｉｔｏｎＸ＿１００为显色体系，建立了双波长Ｋ系数法同时测定重油中微量铁、锌的新方法。考查了测定条件及萃取分离条件。线性范围：铁０～４８０μｇ／Ｌ、锌０～４００μｇ／Ｌ，合成样回收率（１００±２）％，重油测定结果的相对标准偏差小于５％。方法简便、准确。

In the Fe 2+ (Zn 2+ )-5_Br_PADAP-Triton X _100 coloured system,double wavelength K _coefficient spectrophotometry for simultaneous determination of iron and zinc in heavy oil was established,in which trioctylamine was used to extract and separate interfering ions.The determination and extraction conditions were examined.The linear range is 0～480 μg/L for iron and 0～400 μg/L for zinc.The extraction recovery for synthetic sample is (100±2)%.The relative standard deviation for heavy oil samples is less than 5%.The method is convenient and accurate.