基于化学发光检测的气体扩散流动注射分析法灵敏且超快速测定砷（III）

Sensitive and ultra-fast determination of arsenic(III) by gas-diffusion flow injection analysis with chemiluminescence detection.

作者信息

Lomonte Cristina, Currell Matthew, Morrison Richard J S, McKelvie Ian D, Kolev Spas D

机构信息

School of Chemistry, The University of Melbourne, Victoria 3010, Australia.

出版信息

Anal Chim Acta. 2007 Jan 30;583(1):72-7. doi: 10.1016/j.aca.2006.09.049. Epub 2006 Oct 4.

DOI:10.1016/j.aca.2006.09.049

PMID:17386528

Abstract

A novel chemiluminescence gas-diffusion flow injection system for the determination of arsenic(III) in aqueous samples is described. The analytical procedure involves injection of arsenic(III) samples and standards into a 0.3 mol L(-1) hydrochloric acid carrier stream which is merged with a reagent stream containing 0.2% (w/v) sodium borohydride and 0.015 mol L(-1) sodium hydroxide. Arsine, generated in the combined carrier/reagent donor stream, diffuses across the hydrophobic Teflon membrane of the gas-diffusion cell into an argon acceptor stream and then reacts with ozone in the flow-through chemiluminescence measuring cell of the flow system. Under optimal conditions, the method is characterized by a wide linear calibration range from 0.6 microg L(-1) to 25 mg L(-1), a detection limit of 0.6 microg L(-1) and a sample throughput of 300 samples per hour at 25 mg L(-1) and 450 samples per hour at 25 microg L(-1).

摘要

描述了一种用于测定水样中砷（III）的新型化学发光气体扩散流动注射系统。分析过程包括将砷（III）样品和标准品注入0.3 mol L（-1）盐酸载流中，该载流与含有0.2%（w/v）硼氢化钠和0.015 mol L（-1）氢氧化钠的试剂流合并。在合并的载流/试剂供体流中生成的砷化氢，通过气体扩散池的疏水聚四氟乙烯膜扩散到氩接受流中，然后在流动系统的流通式化学发光测量池中与臭氧反应。在最佳条件下，该方法的特点是线性校准范围宽，从0.6 μg L（-1）到25 mg L（-1），检测限为0.6 μg L（-1），在25 mg L（-1）时每小时样品通量为300个，在25 μg L（-1）时每小时样品通量为450个。