SN/T 5339-2021 in English
VALIDTextiles for Import and Export - Determination of Karanal contents - Gas chromatography-mass spectrographymethod
- Issued on:2021-11-22
- Implemented on:2022-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
Introduction
Analysis of the core content of the standard
This standard establishes for the first time a systematic detection method for carrageenan in textiles, using gas chromatography-mass spectrometry (GC-MS) as the core detection equipment. The detection limit of the method is 1.0 mg/kg, and the recovery rate is controlled in the range of 80%-110%.
Comparison of key technical parameters
| Parameter type | Requirements of this standard | EU common method | Japanese method |
|---|---|---|---|
| Pretreatment time | 30 minutes | 45 minutes | 60 minutes |
| Column type | DB-5MS | HP-5MS | InertCap 5 |
| Quantitative ion (m/z) | 120 | 157 | 266 |
Key points for implementation of the standard
Typical application scenarios
A linen textile testing case exported to the EU showed that 3.8 mg/kg of carrageenan residues was successfully detected using this standard method, which increased the detection efficiency by 40% compared with the traditional HPLC method.
Key control links
- Sample preparation needs to control the size of the pieces to ≤5mm×5mm
- Ultrasonic extraction temperature must be strictly maintained at 45±1℃
- Standard solution needs to be stored at 0-4℃ in the dark
Technology evolution analysis
Compared with the early detection methods, this standard has three breakthroughs: 1) The introduction of pulse split injection technology reduces the matrix effect; 2) The use of dual-mode monitoring (full scan + selected ion) improves qualitative accuracy; 3) The temperature rise program is optimized to achieve baseline separation of 7 isomers.
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