DIY a Formaldehyde Detector

HCOH (Formaldehyde) is colorless, poisonous, high water-soluble, high alcohol-soluble and high ether-soluble gas with an obnoxious odor. It is widely used in decoration, such as adhesives, carpeting, decorative paneling and so on. HCOH is a prominent factor in sick-building syndrome as its emissions (accelerated by heat and moisture) irritate eyes and mucous membranes in nose and throat, and cause headache and dizziness. It is widely used in decoration, such as adhesives, carpeting, decorative paneling and so on.
My brotherhave just decorated a new house as the marriage house couple of days ago and he cannot wait for long, for the wedding date is fixed in 1st-Oct. There are many things to check and purify air, kinds of plants and tools. The last time I saw him, he was buying a formaldehyde detector on line, but he complained the inaccuracy of the detector yesterday. As a maker, how could I miss this chance to DIY a simple HCOH detector?
The common solution to measure HCHO in air is the reagent or colorimetric card. But the solution will occupy much time, and used only once. And the result is not very accurate and you just know probably. VOC gas sensor is second-generation solution. it can detect HCHO roughly, because this sensor only expresses the whole concentration of VOC gas, not just HCHO only. There are three kinds of HCOH detectors in the main market, semiconductor sensor, resistance heating and test paper.”

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