GB/T 1606-2025 in English
VALIDSodium bicarbonate for industrial use
- Issued on:2025-06-30
- Implemented on:2026-01-01
- File Format:PDF
- Delivery:Via email within 5 business days
$306.00
《GB/T 1606-2025工业碳酸氢钠》由TC63（全国化学标准化技术委员会）归口，TC63SC1（全国化学标准化技术委员会无机化工分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Core Changes in the Standard Revision
| Revision Items | 2008 Edition | 2025 Edition | Technical Impact |
|---|---|---|---|
| Product Classification | Single Category | Three Classifications (Fine Chemicals/General Industry/Environmental Protection) | Achieving Differentiated Quality Control |
| Chloride Detection | Visual Turbidimetry | New Potentiometric Titration (Arbitration) | 10 Times Improved Accuracy |
| Iron Content Detection | Spectrophotometry | New ICP-OES method | Detection limit reduced to 0.0001% |
Analysis of Key Technical Indicators
Taking sodium bicarbonate for Class I fine chemicals as an example, the total alkali content requirement is increased from 99.0% to 99.5%, and the chloride limit is tightened to 0.05%. The new standard introduces inductively coupled plasma optical emission spectrometry to detect iron content, combined with a microporous membrane filtration method to determine water-insoluble matter, significantly improving detection accuracy.
Comparison of detection method upgrades
| Detection items | Eliminated methods | New methods | Advantage analysis |
|---|---|---|---|
| Water-insoluble matter | Asbestos filter paper method | Microporous filtration membrane method | Avoid asbestos contamination, accuracy ±0.006% |
| Sulfate | - | Barium sulfate gravimetric method | Arbitration method, improved accuracy |
Implementation suggestions
- Laboratory transformation: Configuration class=instrument>Automatic potentiometric titrator and ICP-OES equipment
- Method validation: Comparative testing of new and old methods is conducted in accordance with CNAS requirements
- Quality control: Differentiated inspection procedures are established for three types of products
Background of standard evolution
This revision responds to environmental protection requirements (eliminating the asbestos method), adapts to downstream industry upgrades (such as strict control of trace metals in lithium battery materials), and introduces advanced experience from international standards such as ASTM and ISO to promote the integration of my country's soda ash industry technology with international standards.
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