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Determination Formaldehyde in Indoor Air by Simultaneous Prosess of Collection and On-ACF Derivatization and Thermal Desorption-capillary Gas Chromatography


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Determination Formaldehyde in Indoor Air by Simultaneous Prosess of Collection and On-ACF Derivatization and Thermal Desorption-capillary Gas Chromatography
WANG Yu-Qun12WANG Zheng-ping2
1.Testing Center for Quality of Construction Engineering,Jiangsu Institute of Building Science,Nanjing 210008,China;2.School of Chemcial Engineering,NUST,Nanjing 210094,China
formaldehyde indoor air activated carbon fiber O-(23456-pentafluorobenzyl)hydroxylamine derivatization direct thermal desorption capillary gas chromatography
A combined method is proposed here to determinate formaldehyde(HCHO) in indoor air with the derivative reaction of formaldehyde with O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine(PFBHA) coated on activated carbon fiber(ACF) carrier at the same time when air samples are collected by direct thermal desorption/capillary gas chromatography.In the experiment section,the correlated conditional experiments are done.Under the optimal conditions,using formaldehyde standard samples and direct thermal desorption/capillary GC analysis,the calibration curve of the formaldehyde concentration and the chromatographic peak area of PFBHA-HCHO oxime is drawn with the linear regression equation,and linear regression coefficient R2 is 0.999 9.The minimum detection limit of formaldehyde is 1.8 ng.The precision test shows that the relative standard deviation of the six-times repeated measurement for formaldehyde standard sample is 0.70%,and the relative standard deviation of the formaldehyde concentration(RSD) is 0.72%.The contrast experiment shows that the method is better in accuracy than that of phenol reagent spectrophotometriy.The experimental data show that the method can be accurately used in measuring the formaldehyde content in indoor air in the range of 0.000 368~0.409 mg/m3.


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Last Update: 2012-04-30