If the index of formaldehyde is between 0. 1-0.5, it should be analyzed according to the environmental situation and the human body's resistance. If you pay attention to opening doors and windows, the human immunity and resistance are relatively good, and adults can try to live, but in this case, children and children are usually not recommended to live, and once adults live here, they need to go to the hospital immediately.
Formaldehyde detection method
The detection methods of formaldehyde in indoor, textile and food at home and abroad mainly include spectrophotometry, electrochemical detection, gas chromatography, liquid chromatography and sensor method.
Spectrophotometric method
Spectrophotometry is a qualitative and quantitative analysis method based on the selective absorption of electromagnetic radiation by substances with different molecular structures, and it is the most conventional method to detect formaldehyde in indoor, textile and food. There are acetylacetone method, phenol reagent method, AHMT method, magenta sulfurous acid method, chromotropic acid method, phloroglucinol method, catalytic spectrophotometry and so on. Each detection method focuses on different application fields and has its own advantages and limitations.
Electrochemical process
Electrochemical analysis is a method to judge the concentration of analyte in the reaction system and make quantitative analysis according to the changes of current (voltammetry), electricity (coulometry) and potential (potentiometry) produced in chemical reaction. There are two methods for formaldehyde detection: polarography and potentiometry.