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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。
The interference ions were extracted and extracted with n-octylamine, and the dual-wavelength system was developed with the color system of Fe2 + (Zn2 +) - 5_Br_PADAP (2- (5-bromo-2-pyridylazo) -5-diethylaminophenol) -TritonX_100 Simultaneous Determination of Trace Iron and Zinc in Heavy Oil by K Coefficient Method. Examined the determination of conditions and extraction conditions. The linear range was 0-480 μg / L for iron and 0-400 μg / L for zinc. The recovery rate was 100 ± 2%. The relative standard deviation of heavy oil was less than 5%. The method is simple and accurate.