Portable system for near-real time measurement of gaseous formaldehyde by means of parallel scrubber stopped-flow absorptiometry

Autor:	Kotaro Mori, Kei Toda, Shizuko Hirata, Ken Ichi Yoshioka
Rok vydání:	2005
Předmět:	Detection limit medicine.diagnostic_test Detector Analytical chemistry Formaldehyde Scrubber Biochemistry Analytical Chemistry chemistry.chemical_compound chemistry Spectrophotometry Reagent medicine Environmental Chemistry Diffusion (business) Sensitivity (electronics) Spectroscopy
Zdroj:	Analytica Chimica Acta. 531:41-49
ISSN:	0003-2670
DOI:	10.1016/j.aca.2004.08.070
Popis:	Formaldehyde, HCHO, is one of the important causal agents of sick-building syndrome. It is also an important product of ambient air photochemistry. We report here a portable instrument capable of a 0.08 ppbv limit of detection (LOD) and a time resolution of 5 min that is useful for both indoor and ambient air applications. The detection is based on efficient gas collection and chromogenic reaction with 3-methyl-2-benzothiazolone hydrazone (MBTH) through a pair of alternately sampling small-bore porous-membrane tube diffusion scrubbers (DS). The chemistry is well established, requires no special reagent preparation or elevated reaction temperatures and permits the use of inexpensive light emitting diode (LED)-based detectors without need for long path cells. Stopped flow alternate sampling allows an HCHO collection performance, an order of magnitude better than any previous system with high throughput and high sensitivity. Results for indoor and ambient air analyses are presented.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ccd53c14f20869e0a397b350707b9a4a https://doi.org/10.1016/j.aca.2004.08.070 Zobrazit plný text záznamu Full Text from ScienceDirect