Abstract: This paper studies determination of larger toxicity the PCBs77, 81,105,114, 118,123,126,156,157,167,169,189 in food, high-speed freezing centrifuge, solid phase extraction column test method style purification, purification, separation with high efficiency gas chromatography - electron capture detection (GC-ECD), and high sensitivity, good qualitative and quantitative characteristics of mass spectrometry (MS). Through the constant pressure on the gas chromatography process, constant process and the programmed temperature method comparison of results obtained with GC-MS operating conditions for optimum PCBs. And found that the use of gas chromatography carrier gas of constant linear speed control method can improve the separation, shortening analysis time. With the established method of determination of toxicity of food in larger samples, 12 kinds of PCBs in the linear range of 0.001-2μg / L; correlation coefficient r is about 0.99, recoveries of 96.25% -117.5%, and RSD% <21%, detection limit in 0.4ppb-0.5ppb range.
With the public polychlorinated biphenyls (PCBs) increase awareness, PCBs and PCBs contaminated waste must be identified as soon as possible, reasonable collection and safe disposal, to prevent PCBs continue to pollute the environment. PCBs present our research work mainly in the list of investigations, the level of environmental pollution monitoring and analysis methods for detection of PCBs is still a lack of technology. Along with the Stockholm Convention implementation of national action programs to develop and carry out, PCBs in the detection technology will be a persistent organic pollutant control one of the hot area of research.
Keyword: PCBs; electron capture detector; gas chromatography - mass spectrometry; freeze centrifuged; solid phase extraction;
