中文摘要：

研究汉江下游水体及鱼体多环芳烃（PAHs）含量,进行健康风险评价,为汉江下游PAHs污染防治提供基础资料。在汉江下游8个代表性水厂取水口采集水样及在相应江段渔获物中选取7种典型鱼,利用气相色谱质谱联用仪（GC-MS）测定水样及鱼肌肉中16种优控多环芳烃的含量,并用美国环保局（USEPA）推荐的健康风险评价模型进行健康风险评价。8个采样断面水体中Nap、Ace、Phe、An、Ba A、Bk F检出率为100%,Bb F、In D等均未检出,其他多环芳烃检出率分别为Fle 50%、Acy 25%、Flu 62.5%、Pyr 25%、Chr 25%、Ba P 75%、Dah A 12.5%、Bghi P25%。汉江下游水体中16种PAHs总含量平均值为100.67 ng/L,最小值为65.8 ng/L,最大值为155.94 ng/L。结构组成主要以低环为主（70.4%）,中环其次（22.2%）,高环最低（7.4%）。7种鱼体内16种优控PAHs的含量范围为（43.42±0.50）-（113.06±3.57）ng/g,平均组成低环、中环、高环PAHs分别占总PAHs的57.9%、20.2%、21.9%。高环在鱼体内比例显著高于在水体中,表明高环PAHs在鱼体内的富集能力更强。饮用水健康风险估算总量为2.25×10-（-8）-5.32×10-（-8）/a,总体水平为风险不明显;7种鱼食用的PAHs健康风险估算范围为8.00×10^-7-2.08×10^-6/a,总体评价为可接受水平,均低于国际辐射防护委员会推荐的最大可接受风险水平5.0×10^-5/a,部分鱼食用的人体健康风险值高于USEPA建议的可接受风险1.0×10^-6/a。

英文摘要：

Polycyclic Aromatic Hydrocarbons（ PAHs） are a kind of persistent organic pollutant widely distributed on earth. According to reports,PAHs have been detected in the waters and fish of some rivers and lakes in China.Hanjiang is the largest tributary of the middle Yangtze River and industry along the lower Hanjiang River has developed rapidly and discharge of industrial waste threatens the water quality. In this study,16 PAHs,identified as priority pollutants by the U. S. Environmental Protection Agency（ USEPA）,were measured in water and fish collected from the lower Hanjiang River. The distribution of PAHs in the water and fish were analyzed and a health risk assessment was carried out using the assessment model recommended by USEPA. In December of 2015,water samples were obtained at the intake of eight representative water works and samples of seven typical fish species were collected from the corresponding river sections： Cyprinusauratus,Cyprinuscarpio,Squaliobarbuscurriculus,Sinipercachuatsi,Silurusasotu,Peltebagrusfulvidraco and Culterilishaeformis. The PAHs were determined by gas chromatography-mass spectrometry（ GC-MS） and common abbreviations for the PAHs are used to save space. Six PAHs were detected at all eight sampling cross-sections： Nap,Ace,Phe,An,Ba A and Bk F. The detection rates of Fle,Acy,Flu,Pyr,Chr,Ba P,Dah A and Bghi P were,respectively,50%,25%,62. 5%,25%,25%,75%,12. 5% and25% and Bb F and In D were not detected. The total content of the 16 PAHs in the water of the lower Hanjiang River averaged 100. 67 ng/L,with a minimum value of 65. 8 ng/L and maximum value of 155. 94 ng/L. The structural composition of PAHs was dominated by low molecular weight（ LMW） PAHs（ 70. 4%）,followed by medium molecular weight（ MMW） PAHs（ 22. 2%） and high molecular weight（ HMW） PAHs（ 7. 4%）. The content of the16 PAHs in the seven fish species ranged from（ 43. 42 ± 0. 50 ng/g） to（ 113. 06 ± 3. 57 ng/g）. LMW PAHs,MMW PAHs and HMW PAHs accounted,respectively,for 57. 9%,20.