Development of a passive sampler for long-term measurements of formaldehyde and total oxidants in air

被引：5

作者：

Bertoni, G ^{[1
]}

Ciuchini, C ^{[1
]}

Di Palo, V ^{[1
]}

Possanzini, M ^{[1
]}

机构：

[1] CNR ADR Roma, Ist Inquinamento Atmosfer, Monterotondo, Italy

来源：

CHROMATOGRAPHIA | 2005年 / 61卷 / 7-8期

关键词：

column liquid chromatography; field validation; passive sampler; formaldehyde in air; 1-methyl-1-(2,4-dinitrophenyl)hydrazine;

D O I：

10.1365/s10337-005-0525-8

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

A diffusive sampling device is described that is capable of reliable measurements of formaldehyde and total oxidants (Ox = ozone + nitrogen dioxide) at sub-ppbv concentration levels in ambient air. These species are collected on silica gel particles coated with 1-methyl-1-(2,4dinitrophenyl)hydrazine (MDNPH) and phosphoric acid. The formaldehyde hydrazone (HCHO-MDNPh) and the N-methyl-2,4-dinitroaniline (MDNA) formed are extracted with acetonitrile and determined by HPLC with UV detection at 365anm. The measured sampling rate for HCHO, 15.0 mLmin(-1), agrees well with the theoretical value of 16.0, whilst an experimental sampling rate of 10.7 mLmin(-1) (25% lower than the calculated one) is observed for Ox. The sampling rates seem to be independent of the sampling duration up to one month. The precision of the measurements for co-located passive samplers averaged 7.3% for HCHO and 7.2% for Ox in urban air.

引用

页码：385 / 389

页数：5

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