摘要
研究了以微乳液（CTMAB＋正丁醇＋正庚烷＋水）为介质,5′-硝基水杨基荧光酮为显色剂,在KH2PO4-Na2HPO4缓冲体系中,采用分光光度法直接测定油样中微量铜（的方法。试剂与铜形成的络合物最大吸收波长位于570 nm处。25 mL溶液中,铜（含量在0~9μg范围内服从比尔定律,其摩尔吸光系数ε570=1.4×105L.mol-1.cm-1。采用抗坏血酸作为掩蔽剂,消除了油样中存在的Ni2＋,Fe3＋,Al3＋等干扰离子对测定所产生的影响。该方法应用于大庆原油和砂油中铜（的测定,加标平均回收率分别为99.6%,97.8%,相对标准偏差（RSD）分别为0.74%,0.84%。
By using the micro-emulsion （CTMAB＋ n-butyl alcohol＋heptane＋water） as medium, 5＇- nitro-salicylfluorone as chromogenic agent, a spectrophotometric determination of trace copper（Ⅱ） in oil sample has been achieved in KH2 PO4-Na2 HPO4 buffer system. The maximum absorption wavelength of the complex of copper and the chromogenic agent was 570 nm. Beer＇s low was obeyed for copper（[I） content in the range of 0-9 μg/mL in 25 solution with the apparent molar absorptivity of 1.4×10^5 L · mo1-1· cm-1. The ascorbic acid was used to mask Ni2＋ ,Fe3＋ ,Al3＋ ,ere in the determination. The method has been used to the determination of copper（Ⅱ） in Daqing crude oil and oil sand with the average re- coveries of 99.6% and 97.8%, and the relative standard deviation（RSD） of 0.74% and 0. 84%.
出处
《冶金分析》
CAS
CSCD
北大核心
2008年第9期74-76,共3页
Metallurgical Analysis
