GB/T 669-2023 in English
VALIDChemical reagent―Strontium nitrate
- Issued on:2023-08-06
- Implemented on:2024-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 669-2023化学试剂 硝酸锶》由TC63（全国化学标准化技术委员会）归口，TC63SC3（全国化学标准化技术委员会化学试剂分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
In-depth interpretation of the National Standard of the People's Republic of China GB/T 669-2023
1. Analysis of standard background and technological evolution
GB/T 669-2023 "Chemical reagent strontium nitrate" is an important standard in the field of chemical reagents, replacing the long-used GB/T 669-1994 version. This revision is 29 years after the last update. During this period, the production and application technology of strontium nitrate have undergone significant changes. The new standard fully considers the needs of industry development.
2. Comparison of standard frameworks
| Items | Requirements of the 1994 version | Requirements of the 2023 version |
|---|---|---|
| pH value range | Not specified | 4.0~6.0 |
| Clarity test | Qualified | ≤No. 2 (analytical pure)/ ≤No. 4 (chemical pure) |
| Upper limit of sodium content | ≤0.03% | ≤0.02% |
| Upper limit of potassium content | ≤0.02% | ≤0.01% (analytical pure)/ ≤0.02% (chemically pure) |
3. Implementation suggestions and technical points
Manufacturers:It is necessary to update the quality control system in a timely manner and equip testing equipment that meets the new standards. In particular, for the newly added pH value and heavy metal testing items, it is recommended to introduce professional testing instruments.
Testing agencies:When implementing the standards, special attention should be paid to the changes in the determination methods of the items in Table 1, such as the inductively coupled plasma atomic emission spectrometry (arbitration method) of barium and the sodium sulfide-propylene glycol colorimetric method for the determination of heavy metals.
Precautions:When using strontium nitrate, please follow the provisions of GB 15258 chemical safety labels to ensure the health and safety of operators.
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