Portable Sick House Syndrome Gas Monitoring System Based on Novel Colorimetric Reagents for the Highly Selective and Sensitive Detection of Formaldehyde

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• 作者：Yoshio Suzuki ; Nobuo Nakano ; and Koji Suzuki
• 刊名：Environmental Science & Technology
• 出版年：2003
• 出版时间：December 15, 2003
• 年：2003
• 卷：37
• 期：24
• 页码：5695 - 5700
• 全文大小：325K
• 年卷期：v.37,no.24(December 15, 2003)
• ISSN：1520-5851

文摘

Formaldehyde (HCHO) emitted from the furniture and thewalls in the rooms injures the eyes, nose, and respiratoryorgans and causes allergies, which is called sick housesyndrome. We designed and synthesized novel colorimetricHCHO-sensing molecules (KD-XA01 and KD-XA02) whichpossess an enaminone structure and developed a hand-held instrument to monitor indoor HCHO gas with the use ofKD-XA01. These sensing molecules produced speedycolor changes from colorless to yellow under mild conditions,which was caused by the fact that the enaminonestructure in the reagent reacts with HCHO to give alutidine derivative. This reaction took place not only in thesolution phase but also in the solid phase (surface ofthe cellulose paper). To take advantage of this phenomena,a handy and rapid monitoring system has been developedfor detecting indoor HCHO gas using a highly sensitiveand selective detection tablet constructed from the porouscellulose paper that contains silica gel as an adsorbent, KD-XA01, and phosphoric acid under optimum conditions.This instrument detected the surface color change of thetablet from white to yellow, which was monitored as afunction of the intensity of the reflected light illuminatedby an LED (475 nm). The response was proportional to theHCHO concentration at a constant sampling time andflow rate; 0.05 ppm HCHO, which is under the standardvalue set by the World Health Organization, was able to bedetected in 5 min. The detection limit was 0.005 ppm.This monitoring system was not interfered by carbonylcompounds such as acetaldehyde and acetone, alcohols,hydrocarbons, and typical gases such as carbonmonoxide, carbon dioxide, nitrogen dioxide, etc., whichcontributes to the measurement of correct HCHOconcentrations. It was possible to monitor the HCHO gasin the room of a new apartment and school using thisinstrument; the response values were in good agreementwith those obtained by the standard DNPH method.This highly sensitive, selective, and handy HCHO gasmonitor is widely applicable and convenient for users whoare not specialists in this field.