๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Amperometric Detection of Gaseous Formaldehydein the ppb Range

โœ Scribed by R. Knake; P. Jacquinot; P. C. Hauser

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
87 KB
Volume
13
Category
Article
ISSN
1040-0397

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โœฆ Synopsis

The direct amperometric detection of low levels of formaldehyde in the gas phase with an acidic electrochemical cell based on a gold coated Naยฎon membrane as working electrode was investigated. The sensor was found to show a linear response from the detection limit of 13 ppb up to at least 10 ppm. Inยฏuences of the ยฏow rate and the humidity of the gas stream were studied. Also determined were the crosssensitivities to a number of organic and inorganic gases. A new approach to overcome the interferences from NO, NO 2 and SO 2 is proposed whereby formaldehyde is selectively adsorbed from the sample stream with an aluminum oxide ยฎlter. By forming the difference for the measurements with and without ยฎlter a net signal for formaldehyde could be obtained in presence of the interferants.

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