LY/T 2883-2017 "Determination of formaldehyde content in wood-based panels and products" High performance liquid chroma-tography, HPLC "stipulates the use of High performance liquid chroma-tography, HPLC method for the determination of formaldehyde content in wood-based panels and products. This standard applies to the determination of formaldehyde content in formaldehyde absorption solution by perforation extraction, drying method, Gas Analysis method and climate box method. 2,4-Dinitrophenylhydrazone was formed by the reaction of formaldehyde with 2,4-dinitrophenylhydrazine in a weakly acidic environment, and then the absorption value at 365 nm was determined by high performance liquid chromatograph with UV Detector or Secondary Tube Array Detector, so as to obtain the content data of formaldehyde in the sample.