HJ 1271-2022 in English
VALIDAmbient Air-Determination of formic acid, acetic acid and oxalic acid in particulate matter-Ion chromatography
- Issued on:2022-12-12
- Implemented on:2023-06-15
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
本标准规定了测定环境空气颗粒物中甲酸、乙酸和乙二酸的离子色谱法。
本标准适用于环境空气和无组织排放监控点空气颗粒物中甲酸、乙酸和乙二酸的测定。
本标准甲酸、乙酸和乙二酸的最低检出量为 0.8 μg～1.9 μg。环境空气采样量为 144 m3（实际状态），提取液体积为 100 ml，进样体积为 200 μl 时，本方法的检出限为 0.006 μg/m3～0.02 μg/m3，测定下限为0.024 μg/m3～0.08 μg/m3。无组织排放监控点空气采样量为 6 m3（标准状态），提取液体积为 100 ml，进样体积为 200 μl 时，本方法的检出限为 0.2 μg/m3～0.4 μg/m3，测定下限为 0.8 μg/m3～1.6 μg/m3。详见附录 A。
Introduction
Analysis of the core content of the standard
| Technical elements | Hydroxide system | Carbonate system |
|---|---|---|
| Detection limit (μg/m³) | 0.006-0.02 | 0.02-0.08 |
| Precision (RSD) | 0.2%-11% | 0.3%-9.7% |
| Recovery range | 72.2%-118% | 78.8%-120% |
Key Technical Points
1. Principle of the Method
The organic acids in the particle extract were separated by ion chromatograph and detected by a suppressed conductivity detector. The minimum detection amount of formic acid, acetic acid and oxalic acid was 0.8-1.9μg, and the detection limit of ambient air was 0.006μg/m³.
2. Instrument configuration requirements
- Chromatographic column: must be able to effectively separate fluoride ion/acetic acid, sulfate ion/oxalic acid
- Sampler: meets the requirements of HJ 93, supports TSP/PM10/PM2.5 graded sampling
- Ultrasonic extraction equipment: power ≥400W, temperature control <20℃
Implementation difficulties and solutions
Interference elimination strategy
- Chromatographic peak overlap: gradient elution (hydroxyl concentration changes from 1-25mmol/L)
- Water negative peak interference: equal amount of eluent is added to the sample and standard simultaneously
- High temperature degradation: control the water temperature during the extraction process and add NaOH to inhibit volatilization
Key points of quality control
| Control links | Required indicators | Frequency |
|---|---|---|
| Blank test | ＜Method detection limit | Per batch |
| Standard curve verification | Relative error≤±10% | Per 20 samples |
| Spike recovery | 70%-130% | Per 20 samples |
Standard evolution and innovation
As the first industry standard for the determination of organic acids in particulate matter in my country, HJ 1271—2022Innovatively:
- Introducing a dual elution system (hydroxyl/carbonate) to deal with complex matrices
- Specifying the filter membrane to be pretreated at 450°C to eliminate background interference
- Establishing a graded storage scheme (refrigerated at 4°C for 3 days/frozen at -20°C for 10 days)
Application case demonstration
A monitoring station used this standard to determine oxalic acid in PM2.5:
- 144m³ of sample (actual state) was collected through a medium flow sampler
- 1/4 filter membrane ultrasonic extraction, hydroxide gradient elution
- Measured concentration 0.035μg/m³ (RSD=5.2%)
- Spike recovery rate 98.5% (2.5μg addition)
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