A simplified apparatus for ambient formaldehyde detection via GC-pHID

被引：72

作者：

Hopkins, JR ^{[1
]}

Still, T ^{[1
]}

Al-Haider, S ^{[1
]}

Fisher, IR ^{[1
]}

Lewis, AC ^{[1
]}

Seakins, PW ^{[1
]}

机构：

[1] Univ Leeds, Dept Chem, Leeds LS2 9JT, W Yorkshire, England

来源：

ATMOSPHERIC ENVIRONMENT | 2003年 / 37卷 / 18期

基金：

英国自然环境研究理事会;

关键词：

gas chromatography; helium ionization detector; ambient formaldehyde; urban; rain;

D O I：

10.1016/S1352-2310(03)00178-X

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

An apparatus has been developed for the direct determination of ambient, atmospheric formaldehyde using gas chromatography. A loop sample of 1-6 ml is transferred onto the column and the formaldehyde is focused with a cold trap. Following separation, formaldehyde is detected with an argon doped, pulsed discharge helium ionization detector. Absolute values are obtained via calibration with a permeation source. A detection limit of 42 pptv is calculated. The relatively high duty cycle (similar to11 h(-1)) allows measurements to be taken on timescales that are short compared to the atmospheric lifetime of formaldehyde. The reliability of the apparatus has been investigated via a 4-week field campaign at an urban site in Leeds, UK. Diurnal profiles are observed with evidence for both primary emissions from traffic and secondary, photochemical production. A decrease in formaldehyde concentrations was observed during rain events. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：2557 / 2565

页数：9

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