SN/T 5698-2024 in English
VALIDDetermination of water-soluble chlorine content in zinc oxide concentrates - Mercuric nitrate titration method
- Issued on:2024-12-31
- Implemented on:2025-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$102.00
| Standard No: | SN/T 5698-2024 |
| Document status: | VALID |
| Title in English: | Determination of water-soluble chlorine content in zinc oxide concentrates - Mercuric nitrate titration method |
| Title in Chinese: | 氧化锌富集物中水溶性氯含量的测定 硝酸汞滴定法 |
| 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: | 77.120.60-Lead, zinc, tin and their alloys |
| Chinese Classification: | H13-Heavy metals and their alloys analysis method |
| Professional Classification: | SN-Import&Export Inspection |
| Related Keywords: | water-soluble chlorine content
zinc oxide concentrates chlorine content mercuric nitrate titration method introduction technical background zinc oxide |
Introduction
Technical background and scope of application of the standard
This standard is formulated to meet the detection needs of water-soluble chloride ions in zinc oxide concentrates produced by pyrometallurgy, filling the gap in the method for determining the chlorine content in zinc-containing secondary resources. The determination range covers 0.10%-15.0%, meeting the analysis requirements of complex matrices such as zinc leaching slag and lead smelting slag.
In-depth analysis of the principle of the method
| Key steps | Chemical reaction | Key control points |
|---|---|---|
| Hot water extraction | Cl-→solution phase | Constant temperature oscillation at 90-95℃ for 1h |
| Indicator effect | Hg2++diphenylcarbazone→purple complex | pH control yellow-green to yellow |
| Titration endpoint | Hg2++2Cl-→HgCl2 | Light purple-blue does not fade for 30 seconds |
Key reagent configuration specifications
Case of mercuric nitrate standard solution calibration: When weighing 17.131g Hg(NO3)2·H2O, a 1/10,000 balance is required to ensure the weighing accuracy. The range control during the calibration process is <0.002mol/L, reflecting the high reproducibility of the method.
Precision verification data
The collaborative test of 8 laboratories showed that: at the chlorine content level of 10.84%, the repeatability limit r=0.291% and the reproducibility limit R=0.375%, which meets the precision requirements of GB/T6379.2 for industrial analysis methods.
Implementation suggestions
- The drying temperature (105±5℃) must be strictly controlled during the sample pretreatment stage to prevent chlorine loss
- Adjusting the pH to yellow-green to yellow before titration is the key control point
- It is recommended to carry standard substances for quality control in each batch of determination
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