GB/T 39885-2021 in English
VALIDExamination methods for triazolam in suspected drugs - Gas chromatography and gas chromatography-mass spectrometry
- Issued on:2021-04-30
- Implemented on:2021-08-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 39885-2021疑似毒品中三唑仑检验 气相色谱和气相色谱-质谱法》由TC179（全国刑事技术标准化技术委员会）归口，TC179SC1（全国刑事技术标准化技术委员会毒物分析分会）执行，主管部门为公安部。
Introduction
Analysis of the core content of the standard
| Detection method | Technical indicators | Scope of application | Detection limit |
|---|---|---|---|
| GC-MS qualitative analysis | Retention time deviation ≤±1%, ion abundance ratio deviation meets the requirements of Table 1 | Suspected drug solids | 0.05% |
| GC quantitative analysis | External standard method RSD≤10%, internal standard method R²≥0.99 | Content 0.1%-100% | — |
Key technical points
1. Instrument configuration requirements
It is required to be equipped with a DB5MS capillary column (30m×0.25mm×0.25μm) and an EI source mass spectrometer detector, with the carrier gas flow rate set to 1.0mL/min and the split injection (20:1) mode adopted.
2. Sample pretreatment specifications
- Grinding particle size: must pass through 80 mesh sieve
- Extraction solvent: Methanol (chromatographic grade)
- Centrifugation parameters: ≥4000rpm×5min
- Storage conditions: refrigerated at 0-4℃, the qualitative solution is valid for 3 months
Analysis of implementation difficulties
Case: Low-content sample detection
For samples with a content of less than 1%, it is recommended to use a 10mL fixed volume with a no dilution solution (see Appendix A, Table A.2) to ensure that the detection concentration is within the linear range of the standard curve (0.01-0.5mg/mL).
Analysis of Standard Evolution
Compared with the old version, this standard has the following major upgrades:
- Added internal standard method (SKF525A) to improve quantitative accuracy
- Cleared uncertainty assessment requirements (according to GB/T27418)
- Refine the mass spectrometry qualitative judgment standard (ion abundance ratio deviation threshold)
Laboratory operation suggestions
| Links | Critical Control Points | Quality Control Measures |
|---|---|---|
| Pretreatment | Homogeneity | Parallel weighing ≥2 copies |
| Instrumental analysis | System suitability | Standard solution for each batch of samples |
| Data processing | Peak integration | Manual review of automatic integration results |
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