Mechanism of atomization interference by oxygen at trace level in miniature flame hydride atomizers

被引：15
作者：
D'Ulivo, A
Dedina, J
Lampugnani, L
Selecká, A
机构：
[1] CNR, Ist & Proc Chimicofis, Lab Chim Analit Strumentale, I-56124 Pisa, Italy
[2] Acad Sci Czech Republ, Inst Analyt Chem, Lab Trace Element Anal, Prague 14220 4, Czech Republic
来源：
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY | 2005年 / 60卷 / 9-10期
基金：
美国国家卫生研究院;
关键词：
hydride generation; atomic absorption; atomization interference; oxygen interference; mechanism;
D O I：
10.1016/j.sab.2005.06.004
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
The mechanism of atomization interference by oxygen at trace level in gases supplied to miniature argon hydrogen diffilsion flame (MDF), flame-in-gas-shield (FIGS) and flame-in-flame (FIF) hydride atomizers, was investigated for hydrogen selenide, arsine and stibine. A continuous flow hydride generation system coupled with atomic absorption detection was employed. The effect produced by oxygen contamination, intentionally added to gases as contaminant (0- 1290 mu l l(-1)), on spatial distribution of free atoms, on sensitivity and signal shape observed for MDF, FIGS and FIF in different atomization conditions and on the shape of calibration graphs was investigated. The oxygen contaminant reacts with hydrogen radicals reducing their concentration and the size of hydrogen radical cloud. Simultaneously, the rate of free analyte atom reactions is enhanced. Both these factors lead to the decrease of free analyte atom population. (c) 2005 Elsevier B.V All rights reserved.
引用
收藏
页码：1270 / 1279
页数：10
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