GB/T 33401-2016 "Determination of Urea Content in Liquid Fluorescent Whitening Agent Products" is applicable to the detection of urea content in such products, using high-performance liquid chromatography. After dilution and filtration, the sample is separated by a C18 chromatographic column, detected by an ultraviolet detector at a wavelength of 200 nm, and quantified by the external standard method. Alternatively, a visible spectrophotometer can be used to measure the absorbance through a color development reaction to calculate the content. Clear chromatographic conditions and reagent requirements are specified to ensure accurate and comparable test results.
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 | 2016-12-30 00:00:00 | Implementation Date | 2017-07-01 00:00:00 |
