珠江三角洲空气中多氯联苯污染的区域背景研究

选择肇庆市鼎湖山自然保护区作为珠江三角洲地区大气中多氯联苯(PCBs)污染评价的区域性环境背景.研究表明,背景区夏季空气中PCBs的平均浓度为216.94pg/m³,其中气态PCBs的浓度是183.42pg/m³,是颗粒态的5.47倍;PCBs总量的氯数分布以三氯和四氯取代的PCBs为主,两者的总贡献率为86.41%.冬季空气样品中PCBs的总浓度是176.43pg/m³,其中气相中的浓度为123.20pg/m³,仅是颗粒相中浓度的2.31倍.与夏季空气样品不同的是,冬季气相样品中二氯到四氯取代的PCBs浓度仅是颗粒相样品中的2.94倍,几乎是夏季的1/2.与国外研究相比,鼎湖山自然保护区空气中PCBs的浓度很高.

Studies on the reginal background of polychlorinated biphenyl in the Pearl River Delta atmosphere

The Dinghushan natural protected region in Zhaoqing City was chosen as the regional environment background of atmospheric polychlorinated biphenyls (PCBs) pollution evaluation in the Pearl River Delta area. In the air of the background area in summer, the average PCBs content was 216.94pg/m3, of which the gas-phase content was 183.42pg/m3 being 5.47 times of the particle phase. The tri- and tetra-PCBs with total contribution rate of 86.41%. In winter, the total PCBs concentration in the air sample was 176.43pg/m3, with the concentration of gas phase 123.20pg/m3, only 2.31 times as that in the particle phase. In winter, different from the air sample in summer, the content of bi- to tetra- PCBs was only 2.94 times as that in the particle phase sample, being nearly 1/2 of that in summer. Compared with the studies at aboard, Dinghushan natural protected region had very high content of PCBs.