采用探针注入双微等离子体原子发射光谱法测定可萃取有机氯和溴

Determination of extractable organic chlorine and bromine by probe injection dual-microplasma atomic emission spectrometry.

作者信息

Asp T N, Pedersen-Bjergaard S, Greibrokk T

机构信息

Department of Food Hygiene, Norwegian College of Veterinary Medicine, P.O. Box 8146-Dep, 0033 Oslo, Norway, School of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway, and Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, 0315 Oslo, Norway.

出版信息

Anal Chem. 1997 Sep 1;69(17):3558-64. doi: 10.1021/ac961219s.

DOI:10.1021/ac961219s

PMID:21639280

Abstract

A probe injection dual-microplasma spectrometer is evaluated as a low-cost alternative for the determination of extractable organic chlorine and bromine (EOCl and EOBr). The system consists of two 350 kHz plasmas sustained in the same stream of helium and a probe for sample application in the interplasma region. The sample was applied with a microsyringe into a small cup on the sample probe. Subsequently, the extraction solvent was gently evaporated, and the sample cup was pushed into the interplasma region. The first plasma was in direct contact with the sample probe and served to rapidly vaporize the sample material. The vaporized sample was then transferred to the second plasma, where atomic emission was measured for the determination of EOCl and EOBr. For both Cl and Br, 120 pg detection limits and 1000:1 halogen-to-carbon selectivities were obtained, and responses were linear over 3 orders of magnitude.

摘要

一种探针注入式双微等离子体光谱仪被评估为测定可萃取有机氯和溴（EOCl和EOBr）的低成本替代方法。该系统由在同一氦气流中维持的两个350kHz等离子体以及一个用于在等离子体间区域施加样品的探针组成。样品用微量注射器施加到样品探针上的一个小杯中。随后，萃取溶剂被缓慢蒸发，样品杯被推入等离子体间区域。第一个等离子体与样品探针直接接触，用于快速汽化样品材料。然后将汽化后的样品转移到第二个等离子体中，在那里测量原子发射以测定EOCl和EOBr。对于氯和溴，均获得了120pg的检测限和1000:1的卤素与碳选择性，并且响应在3个数量级内呈线性。