有机磷酸酯在岷江干流鱼体中的分布

Distribution of Organophosphate Esters in Specific Tissues of Fish from Main Stream of Minjiang River

有机磷酸酯(organophosphate esters,OPEs)进入水环境中后,可通过生物富集放大最终对人体健康带来威胁。然而目前对OPEs在各流域生物体内的赋存及生物富集效应报道甚少。本文定量测定了岷江干流新津、宜宾和乐山3个站点不同种鱼体的鳃、肝脏、肾脏和肌肉等组织中6种OPEs的含量,包括磷酸丁酯(TnBP)、磷酸三异辛酯(TEHP)、磷酸三丁氧乙酯(TBEP)、磷酸三苯酯(TPhP)、磷酸三氯乙酯(TCEP)和磷酸三氯丙酯(TCPP)。结果表明,位于中下游(乐山和宜宾)的鱼体肌肉中∑_(6) OPEs的含量高于岷江上游的新津。鱼体各组织中∑_(6) OPEs的浓度占全鱼中总浓度的比例依次为肾脏(16%~53%,平均值37%)>肝脏(23%~50%,32%)>鳃(7%~29%,20%)>肌肉(5%~21%,11%)。TBEP和TCPP是岷江鱼体中的优势单体。岷江干流有持续的OPEs输入,其潜在的生态风险值得关注。

As organic pollutants of emerging concern,organophosphate esters(OPEs)can bioaccumulate and biomagnify in food webs after entering into the aquatic environment.These toxic OPEs may eventually pose a threat to human health.The occurrence and bioaccumulation of OPEs in aquatic organisms keep drawing attentions.In this study,the concentrations of six OPEs,including tri-n-butyl phosphate(TnBP);tris(2-ethylhexyl)phosphate(TEHP),tributoxyethyl phosphate(TBEP),triphenyl phosphate(TPhP),tri(2-chloroethyl)phosphate(TCEP)and trichloropropyl phosphate(TCPP),in gill,liver,kidney and muscle of different types of fish collected from the sampling sites of Xinjin,Yibin and Leshan were quantitatively determined.The results showed that the concentrations of ∑_(6) OPEs in muscles of the fish from the middle and lower reaches(Leshan and Yibin sites)of the Minjiang River were higher than that from the upper reaches(Xinjin site).The proportions of ∑_(6) OPEs in different tissues to the whole fish were as follows:kidney(16%~53%,average 37%)>liver(23%~50%,32%)>gill(7%~29%,20%)>muscle(5%~21%,11%).TBEP and TCPP were the dominant OPEs in the fish.There is continuous input of OPEs to the main stream of the Minjiang River.The potential risk of OPEs is worthy of attention.