SN/T 5679-2024 in English
VALIDDetermination of arsenic and mercury in natural eucalyptus oil for export by microwave digestion-atomic fluorescence spectrometry
- Issued on:2024-12-31
- Implemented on:2025-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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| Standard No: | SN/T 5679-2024 |
| Document status: | VALID |
| Title in English: | Determination of arsenic and mercury in natural eucalyptus oil for export by microwave digestion-atomic fluorescence spectrometry |
| Title in Chinese: | 出口天然桉叶油 砷和汞的测定 微波消解-原子荧光光谱法 |
| 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: | 71.040-Analytical chemistry |
| Chinese Classification: | Y41-Fragrances and flavors |
| Professional Classification: | SN-Import&Export Inspection |
| Related Keywords: | standard technical framework core elements arsenic detection mercury detection detection limit
arsenic detection lamp current mercury detection needs arsenic determination microwave digestion-atomic fluorescence spectrometry introduction analysis |
Introduction
Analysis of Standard Technical Framework
| Core Elements | Arsenic Detection | Mercury Detection |
|---|---|---|
| Detection Limit (μg/kg) | 10.00 | 1.00 |
| Pretreatment Reagents | Nitric Acid + Hydrogen Peroxide | Nitric Acid + Hydrogen Peroxide |
| Reduction System | Thiourea + Ascorbic Acid | - |
In-depth Analysis of Method Principles
The standard uses a microwave digestion instrument for sample pretreatment, using a nitric acid-hydrogen peroxide system at a high temperature of 210°C to completely decompose the organic matrix. The arsenic element needs to be pre-reduced to As(III) by a thiourea-ascorbic acid system, while the mercury element exists directly in the form of Hg²⁺.
Optimization of key instrument parameters
Atomic fluorescence spectrometer parameter settings reflect differentiation:
- Arsenic detection uses 300V negative high voltage and 60mA lamp current
- Mercury detection needs to be reduced to 280V negative high voltage and 30mA lamp current
Key points of quality control
Standard requirements:
- Calibration curve correlation coefficient≥0.995
- Relative deviation of parallel sample determination≤10%
- Inter-laboratory reproducibility limit of mercury≤1.03%
Implementation suggestions
Note in actual operation:
- The microwave digestion procedure strictly follows the step-by-step heating mode of 15min to 170℃ → 8min to 210℃ → maintain for 20min
- Before arsenic determination, it is necessary to ensure that the valence state conversion is completed by standing at 20±10℃ for 20 minutes
- The mercury standard solution should be prepared and used immediately to prevent adsorption loss
Sample only — not a preview of SN/T 5679-2024
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