GB/T 43865-2024 in English

1. Background of Standard Formulation and Analysis of Technology

GB/T 43865-2024 is a general rule for the Direct Sampling Mercury Analysis Method, which aims to standardize the method of using instrument analyzers for quantitative analysis. This standard was proposed by the Ministry of Science and Technology of the People's Republic of China and is under the jurisdiction of the National Technical Committee for Instrumental Analysis and Testing Standardization.

With the increasing demand for mercury detection in fields such as environmental monitoring, food safety and industrial testing, traditional sample pretreatment methods have gradually revealed problems such as low efficiency and complex operation. Direct sampling analysis significantly improves detection efficiency and accuracy by simplifying sample processing steps, and has become an important development direction of modern analytical technology.

2. Instruments and Performance Indicators

According to JB/T 5228-2018, the performance indicator requirements of the instrument are as follows:

Note:The stability calculation method is in accordance with JB/T 5228-2018.

3. Analysis steps and methods

The analysis steps of the direct sampling recording method include:

1. Start-up preheating: Ensure that the instrument catalytic pyrolysis system and working gas system are operating normally.
2. Analysis condition selection and optimization: Select appropriate working parameters according to the sample type, such as ashing temperature, decomposition time, etc.
3. Memory effect elimination: Use blank solution to flush the system or burn the sample boat residue at high temperature.
4. Quantitative analysis: Use standard curve method, matrix matching method or standard addition method to measure samples.

4. Implementation suggestions and precautions

• Reagent preparation: Nitric acid solution and potassium dichromate solution must be accurately prepared according to standard requirements to ensure analysis accuracy.
• Environmental Control: The laboratory temperature should be maintained at 20°C ~ 30°C, and the relative humidity should be ≤70%. Avoid strong magnetic field interference.
• Safe Operation: When using dangerous gases such as hydrogen and oxygen, the equipment sealing must be strictly checked to prevent leakage.

Quality Assurance Recommendations: Add blank experiments and quality control samples to every 20 samples or each batch of analysis to ensure the accuracy and precision of the method. It is recommended to calibrate the instrument regularly and update the standard substance library.