GB/T 39672-2020 in English
VALIDMancozeb
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$388.00
| Standard No: | GB/T 39672-2020 |
| Document status: | VALID |
| Title in English: | Mancozeb |
| Title in Chinese: | 代森锰锌 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-12-14 |
| Implemented on: | 2021-07-01 |
| ICS Classification: | 65.100.30-Fungicides |
| Chinese Classification: | G25-Pesticide |
| Professional Classification: | GB-National Standard |
| Related Keywords: | new indicators change range mancozeb
mancozeb introduction core changes new test items arsenic content control atomic fluorescence spectrometry arsenic content manganese/zinc/arsenic content method validation |
| Related Topics: | Zinc manganese
Forest Zinc GBT39672 GB/T 39672-2020 manganese zinc Analytical methods for mancozeb Mancozeb detection method |
本标准规定了代森锰锌原药、可湿性粉剂的技术要求、试验方法、验收和质量保证期，以及标志、标签、包装和储运。
本标准适用于代森锰锌原药、代森锰锌可湿性粉剂产品的质量控制。
注： 代森锰锌、乙撑硫脲的其他名称、结构式和基本物化参数参见附录A。
Introduction
Core changes in the standard revision
| Technical parameters | 2006 version indicators | 2020 version new indicators | Change range |
|---|---|---|---|
| Mancozeb technical mass fraction | ≥88.0% | ≥85.0% | ↓3% |
| Suspension rate of wettable powder | ≥60% | ≥70% | ↑10% |
| Wetting time | ≤60s | ≤90s | Relaxed by 50% |
Analysis of new test items
Arsenic content control
Atomic fluorescence spectrometry was added to determine arsenic content (quantitative limit 0.01μg/g), and the arsenic content of wettable powder was required to be ≤10μg/g. Actual cases show that when using nitric acid-perchloric acid digestion system, it is necessary to control the digestion temperature at 200±5℃ to prevent arsenic volatilization loss.
Persistent foaming test
GB/T28137 method is cited, and the foam volume is <40mL after 1 minute. Laboratory data indicate that samples of preparations containing silicone antifoaming agents should be allowed to stand for 30 minutes before testing to avoid false negatives.
Detection method upgrade
Determination of mancozeb by liquid chromatography
Newly added reversed-phase HPLC method (C8 column, 282nm detection):
- The derivatization reaction needs to strictly control pH=11±0.2
- Ultrasonic temperature≤20℃ (ice bath condition)
- Method precision RSD＜1.5%
Determination of metal elements by atomic absorption method
| Element | Wavelength(nm) | Detection limit | Allowance |
|---|---|---|---|
| Manganese | 279.5 | 0.05μg/mL | ≤5% |
| Zinc | 213.9 | 0.02μg/mL | ≤10% |
Implementation Suggestions
- Quality Traceability System: Establish a quarterly test record for manganese/zinc/arsenic content
- Method Validation: The newly introduced halogen moisture meter needs to be validated in parallel using the Karl Fischer method
- Packaging Update: Add arsenic content and ETU warning labels as required by GB3796
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