笔者在本研究中主要测定了湄洲湾海域12种海鱼鱼体中二噁英类(PCDD/Fs)的残留水平,并通过暴露量计算初步分析了其可能对人体产生的危害.研究发现鱼体内总PCDD/Fs的含量平均值为9.68pg/g(以湿重计),含量受鱼类品种影响较大,秋刀鱼的总PCDD/Fs含量最高,梭鱼最低,变化范围为2.84-20.61pg/g(湿重).总PCDD/Fs的分布特征在不同品种的鱼类中大致相同,主要以OCDF和1,2,3,4,6,7,8-HpCDF为主;鱼体中脂肪含量也可能影响PCDD/Fs在鱼类中的累积性.不同鱼种中WHO·TEQs(毒性当量)在0.26-2.18pg/g(湿重).计算结果表明,湄洲湾地区海鱼食用人群PCDD/Fs的暴露量低于WHO和欧盟食品委员会规定的摄入量上限,但若考虑其它渠道食物的摄入会导致PCDD/Fs的最终暴露量提高,该地区二噁英的毒性污染现状仍不容忽视.
This study mainly determined the residual levels of dioxins ( PCDD/Fs) in 12 species of marine fish in the sea area of Meizhou Bay, and preliminarily analyzed the possible harm to human body through exposure calcula-tion. The study found that the average total PCDD/Fs content in fish was 9. 68 pg/g (based on wet weight), and the content was greatly affected by fish species. The total PCDD/Fs content of Pacific saury was the highest, and that of the barracuda was the lowest, varying between 2.84 - 20.61 pg/g (wet weight). The distribution charac-teristics of total PCDD/Fs are approximately the same in different fish species, mainly OCDF and 1,2,3,4,6,7,8-HpCDF; fat content in fish may also affect PCDD/Fs accumulation in fish. WHO?TEQs in different fish species ranged from 0.26 to 2.18 pg/g (wet weight). The calculation results show that the exposure of PCDD/Fs in ma-rine fish population in Meizhou Bay area is lower than the upper limit of intake of WHO and EU Food and Agricul-ture Commission, but if the food intake of other channels is taken into account, the final exposure of PCDD/Fs will be caused. to improve,and the current status of dioxin pollution in the region can not be ignored.