SN/T 5235-2020 in English
VALIDTextiles for import and export-Determination of the residual content of 19 chlorinated phenols-Liquid chromatography-mass spectrometry method
- Issued on:2020-08-27
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
Introduction
Technical background of the standard
This standard, as an industry standard for entry-exit inspection and quarantine, establishes detection methods for 19 types of chlorophenols in textiles. Chlorophenol compounds are strictly restricted by international standards such as the EU REACH regulations due to their bioaccumulation and toxicity, and the detection limit is required to reach 0.05 mg/kg.
Method principle and technological innovation
Using the negative ion scanning mode of liquid chromatography-mass spectrometry (LC-MS), through:
| Technical links | Key parameters | Innovation points |
|---|---|---|
| Sample extraction | Methanol ultrasonication 3 times | The recovery rate is optimized to 80.3%-103.5% |
| Chromatographic separation | Poroshell 120 SB-C18 column | 2.7μm particle size to achieve baseline separation of 19 compounds |
| Mass spectrometry detection | SIM mode | Multiple ion monitoring improves signal-to-noise ratio |
Key operating points
Example:When testing a certain exported knitwear, pay attention to:
- Cut the sample into pieces less than 5×5mm to ensure extraction efficiency
- The rotary evaporation temperature is controlled below 40℃ to prevent decomposition of the target compound
- Use 5mmol/L ammonium acetate + 0.4% acetic acid as mobile phase to improve peak shape
Implementation suggestions
Laboratories should focus on:
- Conduct blank test and spike recovery simultaneously for each batch of tests
- The standard solution needs to be stored in a brown bottle at 4°C and used within 6 months
- When the test value is close to 0.05mg/kg, mass spectrometry confirmation is required
Analysis of Standard Evolution
Compared with GB/T 20386-2006, this standard:
| Comparison Dimensions | Old Standard | SN/T 5235-2020 |
|---|---|---|
| Detection Types | 5 | 19 |
| Sensitivity | 0.1mg/kg | 0.05mg/kg |
| Analysis time | 35min | 25min |
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