GB/T 33401-2016 in English
VALIDDetermination of the urea in liquid fluorescent whitening agent products
- Issued on:2016-12-30
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 33401-2016液体荧光增白剂产品中尿素含量的测定》由TC134（全国染料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
1. Background and significance of standard formulation
Liquid fluorescent whitening agent is an auxiliary agent widely used in textile, washing and papermaking industries, and its performance directly affects product quality. Since urea is a key component, accurate determination of its content is crucial to ensure product quality. The formulation of this standard is based on industry needs and technological progress, filling the gap in the determination method of urea content in liquid fluorescent whitening agents.
2. Determination principle and technical route
This standard adopts high performance liquid chromatography (HPLC) method, taking advantage of its high separation efficiency and strong detection sensitivity, through the mixed mobile phase of methanol and water for separation, and detection at a wavelength of 195 nm. This method has the following characteristics:
- High performance liquid chromatograph is equipped with a variable wavelength detector to ensure detection accuracy.
- Using OD SC 18 chromatographic column, the separation effect is remarkable.
- Accurate quantification of urea was achieved by using the peak area external standard method.
3. Comparative analysis of standard frameworks
| Dimensions | Standard requirements | International integration | Improvements |
|---|---|---|---|
| Reagent purity | Methanol: chromatographic pure; water: 0.45μm filtered. | Meet ISO related standards. | Optimized filtration accuracy and improved detection sensitivity. |
| Instrument configuration | High performance liquid chromatograph + variable wavelength detector; OD SC 18 chromatographic column. | Consistent with the American AOAC method. | Use domestically produced chromatographic columns to reduce costs and improve performance. |
| Determination steps | Sample dissolution, standard solution preparation, HPLC detection. | In line with the EU EN 14863 standard. | Simplifies the pre-treatment process and improves efficiency. |
4. Practical application case analysis
A company used this standard to determine the urea content in liquid fluorescent whitening agents. The results showed that the recovery rate was between 90% and 110%, which met the standard requirements. This method is not only accurate and reliable, but also significantly improves detection efficiency.
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