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With people environmental awareness and rising living standards , food hygiene , and indoor environmental quality more and more attention . In-depth study of the toxicity of the formaldehyde source generation mechanism , as well as the detection method , the protection of human health , and has become the focus of current research and one of the hot spots . Established spectrophotometry , chemiluminescence flow injection combined with formaldehyde detection methods , a detailed study of the reaction conditions and other factors on the detection method , to explore its paint formaldehyde analysis . First chapter on the nature of formaldehyde toxicity , sources and content standards described in the corresponding summarizes the common formaldehyde detection methods ; highlights the high sensitivity of the flow injection analysis fast , labor-saving , easy to operate technology ; clarify associated with the principle of spectrophotometry and chemiluminescence determination of formaldehyde . Second chapter of traditional spectrophotometric improved , using a combination of flow injection technique and spectrophotometric based on formaldehyde and 3 - methyl-2 - benzothiazolyl hydrazone ( referred to as the phenol reagent) the reaction of the triazine , oxazine the phenomenon that the oxidation of the high iron ions in the acidic solution to form a blue-green compound , as well as the color of the compound with the formaldehyde concentration positive correlation , to be detected by colorimetric , the formaldehyde content . This approach has both selective spectrophotometry , anti-interference ability , but also has the speed of flow injection analysis method , less consumption of reagents and simple operation . Chapter advantage of the high sensitivity of chemiluminescence to detect the lower limit of the low , based on the strong sensitizing effect of formaldehyde chemiluminescence system gallic acid - hydrogen peroxide - hydroxide bell ( or sodium hydroxide ) , and combined flow injection technique , Based on the method of determination of trace formaldehyde , simple equipment , easy to operate , fast , good reproducibility , wide linear range , avoiding the complex operation of the traditional analysis , to improve the speed and accuracy of the analysis of samples , this method has been applied to the determination of the content of formaldehyde in the aqueous coating .
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