SELECTIVE DETECTION OF BROMINATED HYDROCARBONS BY THE PHOTODETACHMENT-MODULATED ELECTRON-CAPTURE DETECTOR

被引：5

作者：

BOGNAR, JA ^{[1
]}

KNIGHTON, WB ^{[1
]}

GRIMSRUD, EP ^{[1
]}

机构：

[1] MONTANA STATE UNIV,DEPT CHEM,BOZEMAN,MT 59717

来源：

ANALYTICAL CHEMISTRY | 1992年 / 64卷 / 20期

关键词：

D O I：

10.1021/ac00044a026

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A version of the photodetachment-modulated electron capture detector (PDM-ECD) is described by which the intentional addition of SiF4 to the detector gas causes selective responses to trace levels of simple brominated compounds, including CF2Br2 and CH2Br2, in the presence of simple chlorinated compounds, including CFCl3, CHCl3, and CCl4. These response characteristics are created by the simultaneous occurrence of the following gas-phase processes within the PDM-ECD: electron capture by the halogenated hydrocarbons, RX, to form halide negative ions, X-; electron photodetachment of Br- ions by a broad-band UV light sources; and preventation of Cl- photodetachment by the association of Cl- with the Lewis acid, SiF4, and other fluorosilicon compounds that result from the addition of SiF4 to the PDM-ECD detector gas. This device is also shown to provide selective responses to iodinated hydrocarbons in the presence of chlorinated and brominated compounds.

引用

页码：2451 / 2455

页数：5

共 25 条

[1] SELECTIVE DETECTION OF IODINATED HYDROCARBONS BY THE ELECTRON-CAPTURE DETECTOR WITH NEGATIVE-ION HYDRATION AND PHOTODETACHMENT [J].