| abstract |
The invention relates to a preparation method of a water-based paint sample to be tested and a precipitation-clarification-AHMT method for measuring the free formaldehyde content in the water-based paint. The preparation method of the water-based paint sample to be tested includes the following steps: mixing the water-based paint containing free formaldehyde, an extractant, a precipitant and water to obtain a mixed solution, ultrasonication, filtration, and taking the supernatant to obtain the sample to be tested. Through the specific precipitation and clarification treatment, the invention can efficiently enrich free formaldehyde in the water-based paint under normal temperature conditions, and at the same time remove impurities such as polymers and colorants that affect the detection, and the obtained sample to be tested has better clarity, and The interference of various factors can be reduced, the detection is convenient, and the processing cost is low. |