Direct determination of ultratraces of thallium in water by flow-injection-differential-pulse anodic stripping voltammetry

被引：69
|
作者：
Lukaszewski, Z
Zembrzuski, W
Piela, A
机构：
[1] Technical University of Poznan, Institute of Chemistry
来源：
ANALYTICA CHIMICA ACTA | 1996年 / 318卷 / 02期
关键词：
stripping voltammetry; flow injection; ultratraces; waters; thallium; river water; tap water;
D O I：
10.1016/0003-2670(95)00436-X
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A direct method for the determination of thallium concentrations on the order of 10(-11) M was developed. Long deposition times (up to 2 h) performed in the flow system with circulation of the analyte ensured the necessary preconcentration. A large volume sample (100 ml) was used to prevent depletion of thallium during deposition. The flow-through cell of a wall-jet type with the mercury film electrode based on an epoxy resin impregnated graphite was used. The detection limit of the method is 2 ng l(-1) at 90 min preconcentration). A spike of 0.05 M EDTA was found to be an effective preservative for fresh water samples. Numerous examples of determinations of thallium in tap water and river water are given.
引用
收藏
页码：159 / 165
页数：7
相关论文
共 50 条
12345