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From the same journal

A simplified apparatus for ambient formaldehyde detection via GC-pHID

Research output: Contribution to journalArticle

Published copy (DOI)

Author(s)

  • J R Hopkins
  • T Still
  • S Al-Haider
  • I R Fisher
  • A C Lewis
  • P W Seakins

Department/unit(s)

Publication details

JournalAtmospheric Environment
DatePublished - Jun 2003
Issue number18
Volume37
Number of pages9
Pages (from-to)2557-2565
Original languageEnglish

Abstract

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.

    Research areas

  • gas chromatography, helium ionization detector, ambient formaldehyde, urban, rain, HELIUM IONIZATION DETECTOR, VOLATILE ORGANIC-COMPOUNDS, ATMOSPHERIC FORMALDEHYDE, MARINE AIR, ACETALDEHYDE, DEPOSITION, RAINWATER, ALDEHYDES, FINLAND, URBAN

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