滴滴涕类农药在广东省鱼类中的残留及人体暴露水平初步评价

检测了采自广东省13个城市水产市场和超市的390个鱼样品中滴滴涕类农药(DDT)及其代谢物(包括o,p’-DDE,p,p’-DDE,o,p’-DDD,p,p’-DDD,o,p’-DDT,p,p’-DDT)的残留浓度.鱼体中DDTs的含量为8.7￣18002ng·g-1(脂肪重)或0.1￣698.9ng·g-1(湿重).不同鱼类之间因生活环境和生活习性的不同,而使其DDTs含量存在较大差别.与我国鱼类食品中DDTs的残留标准相比,仅有2个样品中的DDTs含量水平超过此标准,约占样品总数的0.51%,而超过欧盟水产品标准和美国环境保护局(EPA)标准的样品分别占13.8%和30.5%.广东省居民通过鱼类消费每天DDTs的摄入量为30.8ng·kgbodyweight-1·day-1,仅占FAO/WHO每日允许摄入量的0.3%,但高于其他国家或地区.

DDT Residues in Typical Fishes of Guangdong Province and Human Exposure via Fish Consumption

A total of 390 fish individuals was collected from fish markets and supermarkets in 13 cities of Guangdong Province and analyzed for dichlorodiphenyltrichloroethane(DDT) and its metabolites, including o, p'-and p, p'-DDT, DDE, DDD(designated as DDTs). The concentrations of DDTs ranged from 8.7 to 18, 002ng·g-1 lipid or from 0.1 to 698.9 ng·g-1 wet weight. Large difference of DDTs residue level among different fishes was attributed to their living and feeding habits. Overall, only two fish flesh samples contained higher DDTs levels than China's maximum permissible limits set forth for foodstuff, about 0.51% of the total samples. However, 13.8 and 30.5%, respectively of the fish samples exceeded the advisory limits for human consumption recommended by the Europe Union and US EPA. The daily intake of DDTs by residents of Guangdong Province via fish consumption was 30.8ng·kg body weight-1·day-1 and only 0.3% of the acceptable daily intake established by FAO/WHO; nevertheless, it was higher than those obtained in other regions around the world.