汾河流域太原段河水及沉积物中PFOS和PFOA的浓度分布特征

考察山西省汾河太原段全氟辛烷磺酸(PFOS)和全氟辛酸(PFOA)的浓度分布特征,采用固相萃取(SPE)的前处理方法与高效液相色谱-质谱联用(LC-MS/MS)仪器分析方法,检测了汾河太原段水体及沉积物中PFOS和PFOA的含量.结果表明,汾河水样品中PFOS和PFOA浓度范围分别为3.54~16.23 ng·L-1和2.49~4.79 ng·L-1,沉积物样品中含量分别为7.77~51.22 ng·g-1和1.94~3.54 ng·g-1.汾河太原段水样PFOS的浓度从上游到下游有逐渐升高的趋势,PFOA在各采样点的浓度相近;沉积物样品中PFOS的浓度大致呈从上游到下游逐渐升高的趋势,升高趋势没有水样中的明显,但是PFOA在各采样点的浓度亦相近.此外,PFOS在水体及沉积物中的分配与沉积物中有机碳的含量相关,而PFOA的相关性不显著.

Distribution of Perfluorooctanesulfonate and Perfluorooctanoate in Water and the Sediment in Fenhe River, Shanxi Provice

This study investigated the distribution of Perfluorooctanesulfonate (PFOS) and Perfluorooctanoate (PFOA) in Fenhe River. A solid phase extraction (SPE) pretreatment method was used together with liquid chromatography tandem mass spectrometry (LC-MS/MS) to analyze the concentrations of PFOS and PFOA in Fenhe River, which were found to be in the ranges of 3.54-16.23 ng·L^-1 and 2.49-4.79ng·L^-1 in the water phase, and in the ranges of 7.77-51.22 ng·g^-1 and 1.94-3.54 ng·g^-1 in the sediment, respectively. In water samples, the PFOS levels showed an increasing trend from the upstream to the downstream of the river, while the PFOA levels were similar among all the samples. In sediment samples, the increasing tendency of PFOS concentrations was not as obvious as in water samples, and the PFOA levels were again similar. Besides, the partitioning of PFOS between the water phase and the sediment was related to the content of organic carbon in the sediment. However, there was no significant correlation between PFOA partitioning and the organic carbon content.