GB/T 42333-2023 in English
VALIDSoil and stream sediment—Determination of iodine content—Pressurized ammonia extraction inductively coupled plasma mass spectrometry
- Issued on:2023-03-17
- Implemented on:2023-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 42333-2023土壤、水系沉积物 碘含量的测定 氨水封闭溶解-电感耦合等离子体质谱法》由TC93（全国自然资源与国土空间规划标准化技术委员会）归口，主管部门为自然资源部(国土)。
Introduction
1. Background and significance of standard formulation
Iodine is one of the essential trace elements for the human body and is of great significance in the fields of environmental science and public health. The determination of iodine content in soil and water sediments plays an important role in assessing environmental pollution, guiding agricultural production and protecting public health. The formulation of this standard aims to provide an efficient, accurate and repeatable detection method to meet the needs of laboratory analysis.
2. Comparative analysis of standard frameworks
| Standard name | Scope of application | Principle of method | Precision requirement |
|---|---|---|---|
| GB/T 42333—2023 | Determination of iodine content in soil and stream sediments | Ammonia closed dissolution-inductively coupled plasma mass spectrometry | Method detection limit: $0.07~\mu\mathrm{g/g}$, determination range: $0.23~\mu\mathrm{g}/\mathrm{g} \sim 100~\mu\mathrm{g}/\mathrm{g}$ |
| GB/T 6041 | General rules for mass spectrometry analysis | General principles of mass spectrometry analysis | - |
| JJF 1159 | Calibration specification for quadrupole inductively coupled plasma mass spectrometer | Instrument calibration method | Calibration cycle and accuracy requirements |
3. Principle and technical details of the method
Inductively coupled plasma mass spectrometry (ICP-MS) is a highly sensitive elemental analysis technology, which is particularly suitable for the detection of trace and trace elements. This standard uses the ammonia closed dissolution method to extract iodine from soil and sediment, and then determines its content by ICP-MS.
The key steps include: sample decomposition, calibration curve drawing, data processing, etc. Among them, ammonia closed dissolution is the core link of sample pretreatment to ensure the effective extraction of iodine. The standard recommends the use of mixed mass spectrometry tuning liquid to optimize instrument performance, and the internal standard method to improve the accuracy and precision of the determination.
4. Practical application case
For example, in an environmental monitoring project, researchers used this standard method to analyze the iodine content of contaminated soil. Through comparison and verification with national standard substances, the results showed that this method has good accuracy and precision.
5. Implementation Suggestions
- Laboratory Conditions: Ensure that the equipment meets the requirements, including inductively coupled plasma mass spectrometer, analytical balance and closed sample dissolver.
- Staff Training: Operators need to receive professional training and be familiar with each step of the standard.
- Quality Control: Blank tests and parallel tests should be carried out for each batch of samples to ensure data reliability.
- Result Report: Record and report the measurement results according to the standard requirements, including detection limit and uncertainty analysis.
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