GB/T 44243-2024 in English
VALIDHydrogen for proton exchange membrane fuel cell vehicles—Determination of sulfur compounds, formaldehyde and organic halides—Gas chromatography method
- Issued on:2024-07-24
- Implemented on:2024-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 44243-2024质子交换膜燃料电池汽车用氢气 含硫化合物、甲醛和有机卤化物的测定 气相色谱法》由TC309（全国氢能标准化技术委员会）归口，主管部门为国家标准委。
Introduction
Analysis of the core content of the standard
| Test items | Measurement range (nmol/mol) | Detection limit (nmol/mol) | Key detectors |
|---|---|---|---|
| Sulfur-containing compounds | 0.10-10.0 | 0.01(Hydrogen sulfide) | Sulfur chemiluminescence detector (SCD) |
| Formaldehyde | 1.0-400.0 | 0.1 | Mass spectrometer detector (MSD) |
| Organic halides | 1.0-100.0 | 0.5(monochloromethane) | Mass spectrometer detector (MSD) |
Technical principle and system configuration
The standard adopts the technology of gas concentrator and gas chromatograph:
- Pre-concentration stage: Enrich the target by liquid nitrogen refrigeration or electronic refrigeration adsorption
- Separation and detection: 100% dimethylpolysiloxane column separation, SCD detection of sulfur compounds, MSD detection of formaldehyde/organic halides
- Quantitative method: Calibration curve is established by external standard method, and the forced linear model through the origin requires R²≥0.99
Technical requirements for key equipment
Sulfur chemiluminescence detector (SCD)
- Linear range＞10⁴
- Sulfur detection limit＜0.5pg/s
- Hydrocarbon selectivity＞10⁶
Mass spectrometer detector (MSD)
- EI ion source (70eV)
- Scanning range m/z=28-200
- SCAN/SIM mode required
Implementation points and quality control requirements
| Quality control links | Frequency requirements | Acceptance criteria |
|---|---|---|
| System linearity verification | SCD every 7 days, MSD every month | R²≥0.99 |
| Equimolar response verification | Every six months | Response factor deviation≤30% |
| Precision control | Sample measurement each time | Relative deviation of repeated measurements≤10% |
Analysis of standard technology evolution
This standard has three major breakthroughs compared with traditional methods:
- Multi-component simultaneous detection: Achieve single injection analysis of sulfide/formaldehyde/organic halide
- Improved sensitivity: The detection limit of hydrogen sulfide is 0.01nmol/mol (about 0.3ppt)
- High degree of automation: Trace component enrichment is achieved through the pre-concentration system
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