GB/T 36700.4-2018 in English
VALIDChemicals—Guidance on hazard classification to the aquatic environment—Part 4:Degradation
- Issued on:2018-09-17
- Implemented on:2019-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 36700.4-2018化学品 水生环境危害分类指导 第4部分：降解》由TC251（全国危险化学品管理标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
The core role of degradability in the classification of aquatic environmental hazards
GB/T 36700.4-2018, as a key component of the aquatic environmental hazard classification system for chemicals, systematically standardizes the interpretation method and judgment process of degradability data. Degradability, as an inherent characteristic of chemicals, directly affects their persistence and cumulative risk in the aquatic environment.
Technical Framework of Degradability Assessment
| Assessment Type | Standard Method | Judgment Threshold | Applicable Scenarios |
|---|---|---|---|
| Rapid Biodegradation | GB/T 21801~21857 Series | 28-day Degradation Rate ≥70% | Priority Assessment Method |
| Inherent Biodegradability | GB/T 21816~21818 | Degradation Potential Assessment | Secondary Assessment |
| Simulation Test | ASTM E1279, etc. | Half-life <16 days | Environmental relevance verification |
Analysis of key judgment factors
1. Validity of rapid biodegradability data
The standard clearly requires the evaluation:
- Test substance concentration: Toxicity interference must be excluded within the range of 2-100mg/L
- 10-day observation period: The passing level must be reached within 10 days from the time when degradation reaches 10%
- Inoculum adaptability: The use of pre-adapted inoculum is prohibited
2. Principles for the application of alternative data
When standard test data is lacking:
- BOD5/COD≥0.5 can be used as auxiliary evidence
- Soil degradation data must meet the conditions of no pre-adaptation and environmental concentration
- Only negative conclusions are accepted for QSAR prediction results
Technological evolution and implementation recommendations
This standard reflects three major advances in degradation assessment technology:
- Shifting from single endpoint assessment to multi-evidence weight analysis
- Expanding from laboratory conditions to environmental simulation verification
- Establishing a hierarchical assessment strategy for complex substances
Recommendations for enterprise implementation paths
- Data collection phase: Prioritize the compilation of rapid biodegradability test reports
- Gap analysis: Verify the compliance of the test method against Appendix C of the standard
- Expert evaluation: Use the weight of evidence approach for conflicting data
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