HJ 547-2017 in English
VALIDStationary source emission - Determination of chlorine-Iodometric method
- Issued on:2017-12-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$253.00
本标准规定了测定固定污染源废气中氯气的碘量法。
本标准适用于固定污染源有组织排放废气中氯气的测定，不适用于无组织排放的测定。
Introduction
Background of Standard Revision and Technological Evolution
This standard replaces the HJ 547-2009 version, mainly based on the technical progress of flue gas samplers and changes in monitoring needs. During the 8 years since the implementation of the 2009 version, it was found that the original reagent preparation process had a risk of cross contamination and the connection method of the sampling system affected the accuracy of the data. This revision reduces the method detection limit from 15mg/m³ to 12mg/m³ by adding equipment specifications such as polytetrafluoroethylene filter clips.
Method principle and technological innovation
| Core parameters | 2009 edition | 2017 edition | Improvement significance |
|---|---|---|---|
| Absorption device | Ordinary glass absorption bottle | Porous glass plate absorption bottle (125ml scale) | Absorption efficiency increased by 5% |
| Connection method | Allow latex tube connection | Forced polytetrafluoroethylene inner jacket method | Reduce chlorine adsorption loss |
| Quality Control | No penetration test requirements | Add 10% penetration threshold control | Ensure data integrity |
Analysis of key operation points
Sampling link:When the moisture content of flue gas is greater than 25%, a heating and insulation sampling tube (above 120℃) must be used to prevent condensation of water and cause loss of chlorine gas dissolution. The actual measurement of a coking plant shows that the data of the unheated condition is 18-22% lower.
Titration control:When calibrating with sodium thiosulfate standard solution, the double titration range must be ≤0.5%. The comparison experiment of Beijing Monitoring Center shows that this control can reduce the final concentration error from ±8% to ±3%.
Implementation suggestions and common problems
- Interference treatment: When the exhaust gas contains HF/HCl, it is recommended to install an alkaline pre-absorption bottle in front of the filter membrane clip.
- High concentration samples: For emission sources of >700mg/m³, the sampling time should be shortened to 10-15 minutes.
- Waste liquid disposal: Iodine-containing waste liquid needs to be collected separately, and 10g of sodium thiosulfate is added per liter for neutralization before being transferred to the hazardous waste center.
Method validation data
Validation by 6 laboratories showed that at a concentration level of 78.9mg/m³, the repeatability limit was 3mg/m³ and the reproducibility limit was 6mg/m³. The absorption efficiency reached 94.0% (average value among laboratories), which was 7 percentage points higher than the 2009 version.
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