Speciation of trace metals in natural waters: The influence of an adsorbed layer of natural organic matter (NOM) on voltammetric behaviour of copper

被引:40
|
作者
Louis, Yoann [2 ]
Cmuk, Petra [1 ]
Omanovic, Dario [1 ]
Garnier, Cedric [3 ]
Lenoble, Veronique [2 ]
Mounier, Stephane [2 ]
Pizeta, Ivanka [1 ]
机构
[1] Rudjer Boskovic Inst, Ctr Marine & Environm Res, Zagreb 10002, Croatia
[2] Univ Toulon & Var, Lab PROTEE, F-83957 La Garde, France
[3] Univ Bordeaux 1, CNRS, ISM UMR 5255, Inst Mol Sci,Grp Phys Tox Chim Syst Nat, F-33405 Talence, France
关键词
anodic stripping voltammetry; metal complexing capacity; organic matter; pseudopolarography; speciation; trace metals;
D O I
10.1016/j.aca.2007.11.011
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The influence of an adsorbed layer of the natural organic matter (NOM) on voltammetric behaviour of copper on a mercury drop electrode in natural water samples was studied. The adsorption of NOM strongly affects the differential pulse anodic stripping voltammogram (DPASV) of copper, leading to its distortion. Phase sensitive ac voltammetry confirmed that desorption of adsorbed NOM occurs in general at accumulation potentials more negative than -1.4V Accordingly, an application of negative potential (-1.6V) for a very short time at the end of the accumulation time (1% of total accumulation time) to remove the adsorbed NOM was introduced in the measuring procedure. Using this protocol, a well-resolved peak without interferences was obtained. It was shown that stripping chronopotentiogram of copper (SCP) in the depletive mode is influenced by the adsorbed layer in the same manner as DPASV The influence of the adsorbed NOM on pseudopolarographic measurements of copper and on determination of copper complexing capacity (CuCC) was demonstrated. A shift of the peak potential and the change of the half-peak width on the accumulation potential (for pseudopolarography) and on copper concentration in solution (for CuCC) were observed. By applying a desorption step these effects vanished, yielding different final results. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:37 / 44
页数:8
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