Formaldehyde detecting paper

Details Formaldehyde detecting paper Formaldehyde detecting paper

G - Physics

01

N

G01N 31/22 (2006.01) A61L 2/26 (2006.01) G01N 21/78 (2006.01)

Patent

CA 2129463

Abstract Detecting paper for detecting the formaldehyde present in the atmosphere is prepared by applying hydroxylamine sulfate and Metanil Yellow that changes its color when exposed to sulfuric acid over a carrier of porous sub- stance. When the sample gas passes through the porous carrier, the formaldehyde contained in it produces sulfuric acid (H2SO4) by decomposing the hydroxylamine sulfate as a result of the following reaction: 2HCHO + (NH2OH)2H2SO4 ? 2H2C = NOH + H2SO4 + 2H2O. The sulfuric acid reacts with the Metanil Yellow on the porous carrier, thus leaving a trace of reaction proportional to the concentration of formaldehyde. 18

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