GB/T 11060.2-2023 in English
VALIDNatural gas—Determination of sulfur compound—Part 2: Determination of hydrogen sulfide content by methylene blue method
- Issued on:2023-05-23
- Implemented on:2023-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$233.00
《GB/T 11060.2-2023天然气 含硫化合物的测定 第2部分：用亚甲蓝法测定硫化氢含量》由TC244（全国天然气标准化技术委员会）归口，主管部门为国家标准委。
Introduction
1. Standard background and technical evolution analysis
GB/T 11060 series standards are important specifications for the determination of hydrogen sulfide and its related compounds in my country's natural gas industry. The revised GB/T 11060.2-2023 replaces the previous GB/T11060.2-2008, mainly optimizing the reagent requirements, experimental procedures and precision.
2. Comparison of standard frameworks
| Standard part | Old version content | New version adjustments |
|---|---|---|
| Reagent requirements | No clear requirements for potassium dichromate purity | Clear requirements for benchmark reagents, and add anhydrous sodium thiosulfate |
| Preparation of standard stock solution | No detailed regulations | New preparation method and calibration process |
| Instruments and equipment | No clear temperature control accuracy | Add constant temperature water tank ±1℃ control requirement |
3. Experimental principles and reagent preparation
The methylene blue method uses zinc acetate solution to absorb hydrogen sulfide to generate zinc sulfide, which reacts with N,N-dimethyl-p-phenylenediamine in an acidic medium to generate a blue methylene blue complex. This method uses a spectrophotometer to measure absorbance and calculates the content based on the Lambert-Beer law.
4. Experimental steps and data processing
The experimental steps include sampling, absorption, color development and absorbance determination. The key steps are as follows:
- Gas sample absorption:Use
zinc acetate solution to capture hydrogen sulfide to generate zinc sulfide. - Color reaction:Add N,N-dimethyl-p-phenylenediamine hydrochloride and react with zinc sulfide under acidic conditions to generate methylene blue.
- Absorbance determination:Use a spectrophotometer to measure the absorbance at a wavelength of 670nm, and calculate the hydrogen sulfide content using a standard curve.
5. Precision and Quality Control
The new standard introduces stricter precision requirements to ensure the accuracy and reliability of the data:
| Concentration range (mg/m³) | Repeatability limit | Reproducibility limit |
|---|---|---|
| p≤1.1 | 0.23 | 0.46 |
| 1.1 | 0.46 | 0.92 |
| 4.6 | 10% of the average | 15% of the average |
6. Implementation Suggestions
Laboratory Configuration:Equipped with key equipment such as spectrophotometer, constant temperature water tank and wet gas flowmeter to ensure that the experimental conditions meet the standard requirements.
Staff Training:It is recommended that operators are familiar with the updated content of the standard and improve their technical level through actual case exercises.
Data Management:Establish a complete experimental record and data analysis system to facilitate traceability and quality control.
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