Gao Hong-Wen, Wang Chun-Lei, Jia Jiang-Yan, Zhang Ya-Lei
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji Universit, P. R. China.
Anal Sci. 2007 Jun;23(6):655-9. doi: 10.2116/analsci.23.655.
The complexation between Cu(II) and naphthochrome green (NG) is very sensitive at pH 4.09 with the formation of complex ion Cu(NG)2(H2O)2. It can thus used for the determination of Cu(II) by the light-absorption ratio variation approach (LARVA) with a good selectivity. Both the ordinary detection procedure and continuous flow analysis (CFA) were carried out, where the latter is fit for continuous and rapid analysis of samples. The limit of detection (LOD) of Cu(II) is only 1 ng/ml, which is favorable for direct monitoring of natural water. About 30 samples could be analyzed per hour by CFA. Cu(II) contents in Yangtze River, West Lake, Taihu Lake of China and seawater near Shanghai were determined with satisfactory results. The CFA-LARVA spectrophotometry was the first to be coupled and it will play an important role in the in-situ analysis of natural water quality.
铜（II）与萘酚绿（NG）之间的络合反应在pH 4.09时非常灵敏，会形成络合离子Cu(NG)2(H2O)2。因此，它可用于通过吸光率变化法（LARVA）测定铜（II），具有良好的选择性。普通检测程序和连续流动分析（CFA）均已开展，后者适用于样品的连续快速分析。铜（II）的检测限仅为1 ng/ml，有利于对天然水进行直接监测。通过CFA每小时可分析约30个样品。测定了中国长江、西湖、太湖以及上海附近海域的铜（II）含量，结果令人满意。CFA-LARVA分光光度法是首次联用，它将在天然水质的现场分析中发挥重要作用。
