Determination of copper speciation in freshwater samples through SPE-spectrophotometry

被引:53
作者
Bjorklund, LB [1 ]
Morrison, GM [1 ]
机构
[1] CHALMERS UNIV TECHNOL,DEPT SANIT ENGN,S-41296 GOTHENBURG,SWEDEN
关键词
spectrophotometry; copper speciation; freshwater; bathocuproine; solid phase extraction;
D O I
10.1016/S0003-2670(96)00599-5
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The Cu(I)-bathocuproine complex was separated by solid phase extraction (SPE) on octadecyl (C-18) bonded silica cartridges or disks followed by elution and spectrophotometric detection (SPE-spectrophotometry) and applied as a detection and speciation method for Cu in water samples. For a PTFE-supported C-18 disk, the bathocuproine-available copper detection limit of 0.4 mu g l(-1) for ultrapure water (500 ml sample) was raised to 3.8 mu g l(-1) in polluted water due to filter blockage by colloids. UV irradiation gave total copper analysis, no filter blockage and a lower detection limit. Repeated analysis of drinking water gave a standard deviation of +/- 1%, correct concentration was determined in certified riverine water and a satisfactory result was obtained in an interlaboratory calibration for Cu in freshwater. A comparison of C-18 cartridges and disks for direct analysis of water samples showed long filtration times for a C-18 cartridge and high blanks for a glass fibre-supported C-18 disk; PTFE-supported C-18 disks gave rapid filtration and low blanks in both filtered and unfiltered water samples. A significant difference was noted for Cu determination in the presence of NTA (nitrilotriacetic acid) when bathocuproine was immobilised on the disk rather than pre-equilibrated with Cu, and interpreted in terms of lability of the Cu-NTA complex and short contact time with bathocuproine on the disk. In speciation analysis, SPE-spectrophotometry is sensitive, precise and convenient for freshwater samples and has the advantage over electrochemical analysis at a Hg electrode of being a Hg-free method.
引用
收藏
页码:259 / 266
页数:8
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