摘要
本文研究了在溴化十六烷基三甲基铵存在下,铜（Ⅱ）与Br-BTAQ的配合物显色反应,及用消色法测定微量铜的可能性.结果表明,在pH4.2～5.6的KHC<sub>8</sub>H<sub>4</sub>O<sub>4</sub>—NaOH缓冲介质中,铜（Ⅱ）与Br-BTAQ形成一种黄色配合物,其λ<sub>max</sub>=425nm,表观摩尔吸光系数s<sub>425</sub>=3.92×10<sup>4</sup>,配合比为Cu:Br-BTAQ=1:3,铜含量在0～20μg/25ml时,符合比尔定律.采用消色法,使测定灵敏度提高2倍,可不经分离,直接用于铝合金中微量铜的测定.
The colour reaction of copper(Ⅱ) with 5-(6-bromo-2-benzothiazolylazo)-8-hydroxyquitioline (Br-BTAQ) in tlie presence of cetyltrimethylammonium bromide (CTMAB) and its application indecolouri-sation Spectrophotometric determination of trace copper have been investigated in the paper.It is shown that in buffer medium of KHC8H4O4-NaOH (pH4.8-5.6), copper can form a yellow complex with Br-BTAQ. The apparent molar absorptivity is 3.92×104L mol-1 cm1at 425nm. The molar ratio of copper to Br-BTAQ has been found to be 1 : 3. Beer's law is obeyed in the range of 0-20ug/25ml for copper(Ⅱ).It has been found that the sensitivity of decolourisatioa spectropiiotometry is three times of that of ordinary Spectrophotometric method. The decolourisation method can be applied to the determination of trace copper in aluminum alloy and no separation is required.
出处
《冶金分析》
CAS
CSCD
北大核心
1991年第1期8-11,共4页
Metallurgical Analysis
