SN/T 5690-2024 in English
VALIDDetermination of Fluorine and Chlorine in Manganese Ore by Ion Chromatography
- Issued on:2024-12-31
- Implemented on:2025-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$161.00
| Standard No: | SN/T 5690-2024 |
| Document status: | VALID |
| Title in English: | Determination of Fluorine and Chlorine in Manganese Ore by Ion Chromatography |
| Title in Chinese: | 锰矿中氟和氯含量的测定 离子色谱法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-12-31 |
| Implemented on: | 2025-07-01 |
| ICS Classification: | 73.060.20-Manganese ores |
| Chinese Classification: | D32-Manganese ore |
| Professional Classification: | SN-Import&Export Inspection |
| Related Keywords: | manganese ore samples
manganese ore fluorine determination ion chromatography introduction analysis type conventional manganese |
Introduction
Analysis of the core technology of the standard
SN/T 5690-2024 standard innovatively adopts ion chromatograph as the main detection equipment. The detection limit of this method reaches 0.003%, which is significantly better than the traditional chemical analysis method. The standard clearly stipulates two pre-treatment technical paths:
| Technical parameters | Steam distillation method | High temperature hydrolysis method |
|---|---|---|
| Applicable sample type | Conventional manganese ore | Refractory manganese ore |
| Working temperature | 160-180℃ | 1100℃ gradient heating |
| Processing time | About 60 minutes | 30 minutes + 15 minutes |
| Recovery verification value | 98.2%-102.5% | 97.8%-103.1% |
Control of key experimental conditions
The standard particularly emphasizes the following technical points:
- Precise temperature control: The steam distillation method requires that the temperature in the three-necked flask be strictly controlled in the range of 160-180℃
- Gradient heating program: The high-temperature hydrolysis method requires the sample boat to be advanced in stages from 300℃→600℃→900℃→1100℃
- Eluent selection: It is recommended to use an automatically generated potassium hydroxide eluent or a 0.02mol/L NaOH solution
Actual application case
When the Tianjin Customs Laboratory used this method to determine the manganese ore samples imported from South Africa, it optimized the The oxygen flow rate (400 mL/min) and water vapor ratio (3 mL/min in the first 15 min) of the>high-temperature hydrolysis unit were changed to reduce the RSD of chlorine from 5.8% in the original method to 1.2%.
Method validation data
Collaborative validation by 8 laboratories showed that:
- The repeatability limit of fluorine determination is r=0.0006+0.0247m
- The reproducibility limit of chlorine element is R=0.0018+0.0928m
- The linear range covers 0.003%-1.00% (chlorine) and 0.003%-0.20% (fluorine)
Implementation suggestions
- For manganese ore samples with high silicon content, high-temperature hydrolysis method is preferred
- Regularly check the temperature measurement accuracy of platinum-rhodium-platinum thermocouple
- Each batch of samples should be measured simultaneously with CRM standard materials
- Pay attention to the pretreatment of quartz sand (burning at 1100℃ for 2h)
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
