通过膜分离流动注射分析法在线测定汞（II）。

On-line determination of mercury(II) by membrane separation flow injection analysis.

作者信息

Amini Nazanin, Cardwell Terence J, Cattrall Robert W, Morrison Richard J S, Kolev Spas D

机构信息

School of Chemistry, The University of Melbourne, Parkville, Vic. 3010, Australia.

出版信息

Talanta. 2004 Jul 8;63(4):1069-75. doi: 10.1016/j.talanta.2004.01.014.

DOI:10.1016/j.talanta.2004.01.014

PMID:18969535

Abstract

A rapid and inexpensive gas-diffusion (GD) flow injection method for the on-line determination of Hg(II) in aqueous samples is described. The analytical procedure involves the injection of a Hg(II) sample into a 1.5M H(2)SO(4) carrier stream which is merged with a reagent stream containing 0.6% SnCl(2) and 1.5M H(2)SO(4). Under these conditions Hg(II) is reduced to metallic mercury which partially evaporates through a Teflon membrane into an acceptor stream containing 1.75x10(-4)M KMnO(4) in 0.3M H(2)SO(4). The decrease in the absorbance of the acceptor stream at 528nm corresponding to the absorption maximum of the permanganate anion can be related to the original concentration of Hg(II) in the sample. The method is characterized by a detection limit of 4mugl(-1) and a sampling frequency of 8h(-1). The flow system was successfully applied to the analysis of river samples spiked with Hg(II).

摘要

本文描述了一种快速且廉价的气体扩散（GD）流动注射法，用于在线测定水样中的Hg(II)。分析过程包括将Hg(II)样品注入1.5M H₂SO₄载流中，该载流与含有0.6% SnCl₂和1.5M H₂SO₄的试剂流合并。在这些条件下，Hg(II)被还原为金属汞，金属汞通过聚四氟乙烯膜部分蒸发到含有0.3M H₂SO₄中1.75×10⁻⁴M KMnO₄的接受流中。接受流在528nm处对应于高锰酸根阴离子吸收最大值的吸光度降低与样品中Hg(II)的原始浓度相关。该方法的检测限为4μg l⁻¹，采样频率为8 h⁻¹。该流动系统已成功应用于加标Hg(II)的河水样品分析。