使用介质阻挡放电雾化器的氢化物发生-原子荧光系统测定砷的评估。

Evaluation of a hydride generation-atomic fluorescence system for the determination of arsenic using a dielectric barrier discharge atomizer.

作者信息

Zhu Zhenli, Liu Jixin, Zhang Sichun, Na Xing, Zhang Xinrong

机构信息

Department of Chemistry, Key Laboratory for Atomic and Molecular Nanosciences of the Education Ministry, Tsinghua University, Beijing 100084, PR China.

出版信息

Anal Chim Acta. 2008 Jan 28;607(2):136-41. doi: 10.1016/j.aca.2007.11.041. Epub 2007 Dec 3.

DOI:10.1016/j.aca.2007.11.041

PMID:18190801

Abstract

A new atomizer based on atmospheric pressure dielectric barrier discharge (DBD) plasma was specially designed for atomic fluorescence spectrometry (AFS) in order to be applied to the measurement of arsenic. The characteristics of the DBD atomizer and the effects of different parameters (power, discharge gas, gas flow rate, and KBH(4) concentration) were discussed in the paper. The DBD atomizer shows the following features: (1) low operation temperature (between 44 and 70 degrees C, depending on the operation conditions); (2) low power consumption; (3) operation at atmospheric pressure. The detection limit of As(III) using hydride generation (HG) with the proposed DBD-AFS was 0.04 microgL(-1). The analytical results obtained by the present method for total arsenic in reference materials, orchard leaves (SRM 1571) and water samples GBW(E) 080390, agree well with the certified values. The present HG-DBD-AFS is more sensitive and reliable for the determination of arsenic. It is a very promising technique allowing for field arsenic analysis based on atomic spectrometry.

摘要

为了应用于砷的测定，专门设计了一种基于大气压介质阻挡放电（DBD）等离子体的新型雾化器用于原子荧光光谱法（AFS）。本文讨论了DBD雾化器的特性以及不同参数（功率、放电气体、气体流速和KBH₄浓度）的影响。DBD雾化器具有以下特点：（1）操作温度低（44至70摄氏度之间，取决于操作条件）；（2）功耗低；（3）在大气压下运行。使用所提出的DBD - AFS通过氢化物发生（HG）法测定As(III)的检出限为0.04 μg L⁻¹。用本方法对参考物质果园树叶（SRM 1571）和水样GBW(E) 080390中的总砷进行分析，所得结果与认定值吻合良好。目前的HG - DBD - AFS在砷的测定方面更灵敏、可靠。它是一种非常有前景的技术，可实现基于原子光谱法的现场砷分析。