摘要
采用硫脲掩蔽-EDTA减量滴定法测定原油中的铜含量。讨论了原油的灰化、溶液的酸度、掩蔽剂与指示剂的选择等适宜的实验条件及对测定的影响。通过计算溶液中被滴定全部离子与滴定除铜外其他离子消耗EDTA的差值计算铜含量。方法用于原油中铜的测定，相对标准偏差（n=6）为1．79％，结果同国家标准方法（AAS法）的测定结果相一致，加标回收率在97．2％～100．5％之间。t检验合格。
Micro copper in crude oil was determined by thiourea masking-EDTA minus titration method. The proper experimental conditions including ashing of crude oil, acidity of solution, selection of masking agent and indicator in determination were investigated. The content of Cu was calculated through the difference between consumed EDTA for all ions and ions except Cu in solution. The proposed method was applied to the determination of Cu in crude oil with relative standard deviation （n= 6） of 1.79 %. The results were in good agreement with those obtained by national standard method （AAS）, with the standard addition recoveries of 97.2 %--100.5%, and the qualified t test.
出处
《冶金分析》
CAS
CSCD
北大核心
2009年第1期70-72,共3页
Metallurgical Analysis
