GB/T 33352-2024 in English
VALIDGeneral rules of screening application of restricted substances in electrical and electronic products—X-Ray fluorescence spectrometry
- Issued on:2024-04-25
- Implemented on:2024-08-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 33352-2024电子电气产品中限用物质筛选应用通则 X射线荧光光谱法》由TC297（全国电工电子产品与系统的环境标准化技术委员会）归口，TC297SC3（全国电工电子产品与系统的环境标准化技术委员会有害物质检测方法分会）执行，主管部门为国家标准化管理委员会。
Introduction
Core changes in standard revision and technological evolution
Compared with the 2016 version, GB/T33352-2024 mainly achieves three major technical upgrades: newly added accuracy verification system, optimized detection limit test method, and enhanced X-ray spot positioning accuracy. The standard cites the unified performance test method of GB/T31364-2015, deletes the original Appendix A and incorporates key indicators into the main text, reflecting the standardization trend of detection technology.
Comparison of key performance indicators of XRF spectrometers
| Performance indicators | Professional level requirements | General level requirements |
|---|---|---|
| Precision (3σ) | Polymer materials: Pb/Hg/Cr≤2.2% limit Metal materials: Cd≤15% limit | Polymer materials: Pb/Hg/Cr≤4.5% limit Metal materials: Cd≤20% limit |
| Limit of detection (LOD) | ≤2.5% limit | ≤5% limit |
| Energy resolution | ≤150eV(Mn Kα) | ≤170eV(Mn Kα) |
Analysis of key points of detection implementation
Typical application scenarios
An electrical appliance manufacturer uses EDXRF spectrometer to detect the lead content in PCB solder:
- GBW08422 solder standard material is selected to establish a calibration curve
- The test spot diameter is adjusted to 2mm to meet the requirements of micro solder joint detection
- Ensure the interference correction of Cu Kα (8.04keV) on Pb Lβ (12.61keV) through peak-to-background ratio monitoring
Quality control requirements
- Verify the accuracy of the calibration curve every 3 months
- Perform 4 parallel tests with quality control samples (limit ±15% concentration) before daily testing
- The energy position deviation of the copper sheet must be controlled within the range of ±0.05keV
Technical limitations
The standard clearly points out that the XRF method has two essential limitations: inability to distinguish element valence states (such as Cr⁶⁺ and total chromium) and relative uncertainty typical value of 30%. For controversial samples with Br content > 300mg/kg or Cd content > 100mg/kg, it is recommended to combine wet chemical method for confirmation.
Documentation Specifications
A complete test report should include 16 elements, with the following highlights:
- High-definition images and dimension markings of the test site
- The name of the calibration curve used and the analytical line system
- Original spectrum and interfering element identification
- Conformity statement of spot size and sample thickness
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