SN/T 5252-2020 in English
VALIDDetermination of Cu, Cr, Mn, Ba, Co, TI.Nb, Ta, Ti, Mo, Y, La, Ce, Pr, Nd, Sm, EU, Gd, Dy, Ho, Er, Tm, Yb in imported iron ore-Inductively coupled plasma mass spectrometry(ICP-MS)
- Issued on:2020-08-27
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
| Standard No: | SN/T 5252-2020 |
| Document status: | VALID |
| Title in English: | Determination of Cu, Cr, Mn, Ba, Co, TI.Nb, Ta, Ti, Mo, Y, La, Ce, Pr, Nd, Sm, EU, Gd, Dy, Ho, Er, Tm, Yb in imported iron ore-Inductively coupled plasma mass spectrometry(ICP-MS) |
| Title in Chinese: | 进口铁矿石中铜、铬、锰、钡、钴、铊、铌、钽、钛、钼、钇、镧、铈、镨、钕、钐、铕、钆、镝、钬、铒、铥、镱含量的测定 电感耦合等离子体质谱法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-08-27 |
| Implemented on: | 2021-03-01 |
| Professional Classification: | SN-Import&Export Inspection |
| Related Keywords: | plasma mass spectrometry
plasma mass spectrometer technology iron matrix iron ore mass overlap |
| Related Topics: | Energy Spectrum of Erbium Ion
Cobalt imports GB/T 5252-2020 CuTiTantalum Inductively Coupled Plasma Mass Spectrometry europium |
Introduction
Technical background and significance of the standard
This standard is an important technical basis for the quality supervision of imported and exported iron ore, and is formulated in response to the increasingly stringent quality control requirements of mineral resources in international trade. With the maturity of inductively coupled plasma mass spectrometer technology, the ability of multi-element simultaneous detection has been significantly improved, and the efficiency has been increased by 5-8 times compared with the traditional atomic absorption method, and the detection limit has been reduced by 1-2 orders of magnitude.
Analysis of core detection technology
Principle of the method
After being treated by a microwave digestion system (parameters see Table B.1), the sample is introduced into ICP-MS through a hydrofluoric acid resistant nebulization system. A mixed internal standard of 7 elements including Sc, Lu, In (4.8) is used to correct the matrix effect, and the simultaneous determination of 23 elements is achieved through mass number selection (see Table A.2 for details).
Key Equipment Parameters
| Instrument Components | Technical Parameters | Optimization Requirements |
|---|---|---|
| RF Power | 1300W | ±50W Fluctuation Control |
| Sampling Cone | 1.0mm Nickel Cone | Daily Cleaning |
| Helium Flow Rate | 4.8mL/min | Collision Mode Dedicated |
Element Detection Performance Comparison
In practical applications, it was found that rare earth elements (such as lanthanides) have good linearity in the range of 0.3-100 mg/kg (R²>0.999), while transition metals (such as copper and chromium) are more significantly interfered by the iron matrix and require strict 72Ge internal standard correction. The typical iron ore sample spike recovery data are as follows:
| Element group | Spike amount(mg/kg) | Recovery range(%) | RSD(n=6) |
|---|---|---|---|
| Rare earth elements | 5-50 | 92.3-105.7 | ≤3.8% |
| Heavy metals | 50-500 | 88.6-102.4 | ≤5.2% |
Implementation points and suggestions
Sample pretreatment
Microwave digestion uses a tri-acid system (HCl-HF-HNO₃). Special attention: limonite needs to be pre-digested at 150°C for 10 minutes to prevent sudden reactions from causing pressure relief.
Interference elimination strategy
- Oxide interference: Control CeO⁺/Ce⁺＜1.5%
- Double charge interference: Eliminate through He collision mode
- Mass overlap: Use high resolution mode (0.65-0.8amu)
Quality control
Each batch of analysis should include: blank parallel samples (≤MDL), standard substances (CRM-OREAS series), and 20% parallel samples (RSD meets the requirements of Table 3).
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