正三辛胺萃取-DPC-CPB显色体系分光光度法测定原料油中的痕量铜

Spectrophotometric Determination of Trace Copper in Raw Oil with Diphenylcarbazone Cetylpyridinium Bromide Coloured System by Trioctylamine Extraction

用正三辛胺萃取分离干扰离子，以二苯碳酰二肼（ＤＰＣ）－溴化十六烷基吡啶（ＣＰＢ）－聚乙二醇辛基苯基醚（ＯＰ）为显色体系测定原料油中的痕量铜。考察了测定条件。线性范围０～１．０μｇ／２６ｍＬ，合成样品回收率为１０４％，油样加标回收率在９５％～１１０％之间，油样分析结果的相对标准偏差小于８．８％。方法的灵敏度高，表观摩尔吸收系数为４．９×１０６Ｌ（ｍｏｌｃｍ）－１。

Trioctylamine is used to extract and separate interference ions and diphenylcarbazone cetylpyridinium bromide OP coloured system is utilized to determine trace copper in raw oil The measuring conditions are then studied The range of determination and extraction recovery of synthetic sample are 0～1 0μg/26mL and 103 8% respectively,and the relative standard deviation of analytical results for raw oil is less than 8 8% The method is highly sensitive with an apparent molar absorptivity of 4 9×10 6L·mol -1 ·cm -1