GB/T 33344-2016 in English
VALIDDetermination of 2，4一dinitro-toluene in electrical and electronic products一 Gas chromatography-mass spectrometry
- Issued on:2016-12-13
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 33344-2016电子电气产品中2,4-二硝基甲苯的测定 气相色谱-质谱法》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
Professional interpretation of the determination method of 2,4-Dinitrotoluene in electronic and electrical products
1. Background and significance of standard formulation
With the widespread application of electronic and electrical products around the world, the safety of their materials and components has received increasing attention. 2,4-Dinitrotoluene is a potentially toxic chemical substance that may exist in polymer materials, plastic parts and other related components. The formulation of this standard aims to provide a scientific basis for the detection of such hazardous substances to ensure product quality and environmental safety.
2. Method principle and technical path
This standard uses gas chromatography-mass spectrometry (GC-MS) combined with microwave-assisted extraction and silica gel solid phase extraction to achieve efficient detection of 2,4-Dinitrotoluene. The following are the main steps:
- Sample pretreatment: including splitting, crushing and microwave extraction.
- Solid phase extraction and concentration: Use silica gel column to remove impurities and rotary evaporate to near dryness.
- Gas chromatography-mass spectrometry: Quantitative analysis by internal standard method and qualitative analysis by combining characteristic ions and retention time.
| Steps | Operation method | Key points |
|---|---|---|
| Sample pretreatment | Microwave-assisted extraction, adding internal standard working solution. | Ensure that the extraction temperature and time meet the requirements. |
| Solid phase extraction | Use silica gel column purification and rotary evaporation to concentrate. | Select 0.22μm organic phase syringe filter membrane as the filter membrane. |
| GC-MS determination | Internal standard method for quantitative determination, characteristic ions for qualitative determination. | Mass spectrometer parameters must comply with the requirements of Appendix A. |
3. Specifications of key instruments and reagents
Gas chromatography-mass spectrometry (GC-MS) is the core equipment of this determination method and must be equipped with an electron impact ionization source (EI source). The following are the main instrument parameters:
| Instrument components | Technical requirements |
|---|---|
| Capillary column | Stationary phase: 5% phenyl-polymethylsiloxane, 30m×0.25mm×0.25μm film thickness. |
| Carrier gas | Helium, purity ≥99.999%. |
| Injection method | Split injection, split ratio 10:1. |
4. Implementation recommendations and quality control
To ensure the accuracy and reliability of the measurement results, the following measures are recommended:
- Blank test: Confirm that the experimental environment and reagents are free of contamination.
- Standard curve verification: Regularly check the linear relationship of the working curve.
- Equipment calibration: Ensure that the GC-MS instrument parameters meet the requirements of Appendix A.
- Staff training: Operators must receive professional training and have laboratory experience.
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