云南省会泽县农田土壤中全氟化合物污染特征研究

Contamination Characteristics of Perfluorinated Compounds in Farmland Soil from Huize County of Yunnan Province,China

为探究云南省会泽县农田土壤中全氟化合物(perfluorinated compounds,PFCs)的污染特征及其潜在来源,2015年6月采集云南省会泽县农田土壤42份,利用高效液相色谱-串联质谱仪(HPLC-MS/MS)分析了11种PFCs的含量水平。结果表明,云南省会泽县农田土壤中全氟己酸(perfluorohexanoic acid,PFHx A)、全氟庚酸(perfluoroheptanoic acid,PFHp A)和全氟己烷磺酸(perfluorohexane sulfonate,PFHx S)均未检出,其余8种PFCs(ΣPFCs)的平均含量水平为0.392 ng·g-1,含量范围为0.298~0.998ng·g-1。全氟辛酸(perfluorooctanoic acid,PFOA)和全氟辛烷磺酸(perfluorooctane sulfonate,PFOS)是最主要的PFCs,相对百分含量范围为45.93%~81.86%,其平均含量水平分别为0.116 ng·g-1和0.120 ng·g-1。与国内其他地区土壤中PFCs的含量水平相比,云南省会泽县农田土壤中PFCs含量水平低于上海,与广州、深圳、东莞、安徽、中国东部农村等地区土壤中PFCs的含量相当。主成分分析结果表明,以全氟癸酸(perfluorodecanoic acid,PFDA)、全氟辛烷磺酸(PFOS)和全氟十三酸(perfluorotridecanoic acid,PFTr DA)为主要标志物的2个主成分可以解释云南省会泽县农田土壤中73%的ΣPFCs。工业活动、大气沉降及长距离传输为云南省会泽县农田土壤中PFCs的主要来源。

To explore the pollution characteristics and sources of perfluorinated compounds （PFCs） in farmland soil from Huize County, Yunnan Province, forty-two farmland soil samples were collected in June, 2015. Eleven types of PFCs were quantified by high performance liquid chromatography-tandem mass spectrometry （HPLC-MS/MS）. Perfluorohexanoic acid （PFHxA）, perfluoroheptanoic acid （PFHpA） and perfluorohexane sulfonate （PFHxS） were not detected in all farmland soil samples from Huize County of Yunnan Province. The average value of the other eight PFCs was 0.392 ng. g.1 dry weight, with a range of 0.298-0.998 ng. g.1 dry weight. Perfluorooctanoic acid （PFOA） and perfluorooctane sulfonate （PFOS） were the two most dominant chemicals, whit average value of 0.116 ng-g＂1 and 0.120 ng-gl dry weight, respectively, accounting for 45.93%-81.86% of the total PFCs concentration. Comparing to farmland soil samples from other regions in China, the concentrations were lower than those in Shanghai City, and were similar with those from Guangzhou City, Shenzhen City, Dongguan City, Anhui Province and rural areas in eastern China. Principal component analysis showed that 73% of total PFCs in farmland soil samples from Huize County of Yunnan Province area could be attributed to the two principal components, repre- sented by perfluorodecanoic acid （PFDA）, perfluorooctane sulfonate （PFOS） and perfluorotridecanoic acid （PFTr-DA）, respectively. The PFCs in farmland soil samples in present study mainly originated from industrial point sources, atmospheric long distance transport and precipitation.