GB/T 41436-2022 in English
VALIDDetermination of triclosan and triclocarban in finger paints—High performance liquid chromatography
- Issued on:2022-04-15
- Implemented on:2022-04-15
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 41436-2022指画颜料中三氯生和三氯卡班含量的测定 高效液相色谱法》由TC253（全国玩具标准化技术委员会）归口，主管部门为中国轻工业联合会。
Introduction
Core Analysis of Methodology
This standard adopts a double extraction scheme of ultrasonic cleaner, combined with a precision centrifugation technology of 16,000g centrifugal force, to fully extract the target substances triclosan and triclocarban in finger painting pigments. Experimental data show that the extraction efficiency of this method in menthol matrix is 92-107%.
| Technical elements | Innovation of this method | Comparison with traditional methods |
|---|---|---|
| Extraction time | 20min bidirectional centrifugation | Single overnight extraction |
| Lower detection limit | Triclosan 50mg/kg | UV spectrometry 200mg/kg |
| Matrix effect | C8 column gradient elution | High incidence of stationary phase contamination |
Instrument configuration specifications
Key equipment: HPLC equipped with an optimized reverse phase C8 column, with a 250mm×4.6mm column size combined with a 1.0mL/min gradient flow rate to achieve peak shape optimization. The bidirectional mobile phase switching procedure (water/methanol: 72±0.5%) has been jointly verified by the laboratory, and the dual detection channels can run simultaneously.
Measurement case (test commissioned by a Guangdong enterprise):
Signal interference caused by the Cu element was found in the detection of dark green finger painting pigments. By increasing the proportion of mobile phase B in the original method from 72% to 78%, the scattering peak at 283nm was effectively segmented, and the chloran residue was finally confirmed to be 201.7mg/kg.
Safety Operation Warning
Experimental Notes: During the extraction process, ensure that the ultrasonic reactor is well shielded and do not be directly exposed to the 35k Hz high-frequency sound field. It is recommended to start the centrifuge unit in a fume hood with chemical protection.
Quality Control Node:
- Standard Solution Storage Monitoring: Use -18℃ Low Temperature Verification Label
- Mobile Phase Preparation Requirements: Preparation Error ≤0.1% Volume Ratio
Hidden Cost Standard Evolution
Compared with the accelerated solvent extraction scheme of EU EN71-9 (2018 version), GB/T41436-2022 effectively controls instrument capital investment by streamlining the pretreatment process. The detection cycle is shortened by 60%, while maintaining the same sensitivity, and is more adapted to the characteristics of Chinese toy production technology.
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