GB/T 38339-2019 specifies two colorimetric methods for determining the phosphorus content in fluorescent whitening agent products, aimed at controlling product quality and reducing environmental impact. The main methods include the molybdenum blue method, which is suitable for different concentration ranges, and the molybdenum yellow method, specifically designed for products with a phosphorus content above 500 mg/kg. In actual testing, a UV-Vis spectrophotometer is used according to the method principles to measure the absorbance of the generated colored complexes, thereby completing quantitative analysis. This standard provides a unified and reliable technical specification for the industry.
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 | G55 | ICS | 71.100.01;87.060.10 |
| Release Date | 2019-12-31 00:00:00 | Implementation Date | 2020-11-01 00:00:00 |
