Rapid extraction and purification method for formaldehyde in livestock and poultry blood products and detection application of formaldehyde

The invention discloses a method for rapidly extracting and purifying formaldehyde in livestock and poultry blood products. The method comprises the following steps: (1) weighing a blood product sample to be detected, and extracting with water to obtain an extracting solution; (2) accurately transferring a certain amount of the extracting solution into a test tube A, adding a 1mol/L iodine solution, adding a 1mol/L sodium hydroxide solution, uniformly mixing, standing and reacting for 15-20 minutes, then adding a 1mol/L phosphoric acid solution, adding a 1mol/L sodium thiosulfate solution, and uniformly mixing; and (3) adding diethyl ether for vortex extraction, transferring a diethyl ether layer into a test tube B added with a 0.025 mol/L sodium hydroxide solution in advance, carrying out vortex extraction on the test tube B, discarding the upper diethyl ether layer, adding diethyl ether into the test tube A, repeating the extraction and the back extraction twice, and sucking all the lower solution in the te