GB/T 39689-2020 "Surfactants—Determination of free formaldehyde content" specifies the method for determining the free formaldehyde content in surfactant products. This standard typically employs spectrophotometric methods, such as the acetylacetone colorimetric method, detailing the procedures for sample extraction, color development reaction, colorimetric measurement, and result calculation. It is applicable for detecting unreacted free formaldehyde in surfactants.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active | ||
|---|---|---|---|
| CCS | G72 | ICS | 71.100.40 |
| Release Date | 2020-12-14 00:00:00 | Implementation Date | 2021-07-01 00:00:00 |
