GB/T 32887-2016 in English

1. Background and significance of standard formulation

With the development of the electrical and electronic industry, polychlorinated biphenyls (PCBs), as a widely used insulating material and flame retardant, are becoming increasingly harmful to humans and the environment. In response to this problem, the international community and governments have strengthened restrictions and supervision on PCBs. The formulation of this standard aims to provide a scientific and unified method for the detection of PCBs in electrical and electronic products to ensure product quality and safety.

2. Principle of the method

This method uses gas chromatography-mass spectrometry (GC-MS) to qualitatively identify the target analyte by its retention time combined with the mass spectrum, and uses the external standard method for quantification. The specific steps include sample pretreatment, extraction, purification and instrumental determination.

3. Reagents and Materials

All reagents are of chromatographic grade, including: acetone, n-hexane, dichloromethane and toluene, etc. For the preparation and storage conditions of standard substances, please refer to Appendix A.

4. Sample Processing and Analysis Process

5. Qualitative and quantitative analysis

Qualitative analysis was based on the characteristic ion pairs and chromatographic peak retention time of polychlorinated biphenyls. The quantitative analysis adopts the external standard method, and the concentration of PCBs in the sample is calculated by the standard curve regression equation. The specific formula is: X = (c - c₀)·V / m, where X is the concentration of PCBs in the sample (mg/kg), c is the concentration of PCBs in the sample solution (mg/L), c₀ is the concentration of PCBs in the blank solution (mg/L), V is the fixed volume (mL), and m is the sample mass (g).

6. Implementation Recommendations