• 关键词：汾河上中游流域  多环芳烃  时空分布  分配模型

• 基金项目：山西省科技攻关项目（No.20150313001-2）；山西省自然科学基金（No.2013011040-7）

• 王林芳
• 1. 山西农业大学资源环境学院, 太谷 030800;2. 山西省环境科学研究院, 太原 030027

• 党晋华
• 1. 山西农业大学资源环境学院, 太谷 030800;2. 山西省环境科学研究院, 太原 030027

• 刘利军
• 山西省环境科学研究院, 太原 030027

• 赵颖
• 山西省环境科学研究院, 太原 030027

• 闫双堆
• 山西农业大学资源环境学院, 太谷 030800

• 乔鹏明
• 山西省环境科学研究院, 太原 030027

• 摘要：通过测定汾河上中游流域13个点位丰水期和枯水期水体、表层沉积物中PAHs浓度，分析其分布特征及影响因素.结果表明：汾河上中游流域丰水期和枯水期水中PAHs的平均浓度分别为0.365 μg·L^-1和0.835 μg·L^-1，枯水期PAHs总体高于丰水期；丰水期和枯水期沉积物中PAHs平均浓度分别为1444 μg·kg^-1和2407 μg·kg^-1，枯水期PAHs总体高于丰水期；水和沉积物中PAHs的组成主要是2~4环，但沉积物中高环PAHs组成显著高于水中；丰水期和枯水期中游段（寨上到南关）水体和沉积物中PAHs浓度整体均高于上游段（雷鸣寺到汾河水库）.丰水期和枯水期沉积相-水相分配系数K_p值分别为642~32345 L·kg^-1和671~44929 L·kg^-1，且随PAHs环数变大K_p值增大；丰水期和枯水期沉积相-水相实测的有机碳归一化分配系数（lgK_oc）总体高于预测值上限；丰水期和枯水期lgK_oc与lgK_ow均呈较好的相关性，可决系数（R²）分别为0.764、0.725，枯水期斜率大于丰水期斜率，枯水期较丰水期沉积物吸附的PAHs更多.K_p值与有机碳/COD_Cr比值K_od呈正相关，可决系数（R²）分别为0.625和0.728，丰水期和枯水期PAHs K_p值受沉积物中有机碳含量和水中COD_Cr含量的影响.

• Abstract：The distribution and major components of polycyclic aromatic hydrocarbons (PAHs) were studied in upper middle of the Fen River basin, China. Water and surficial sediment samples collected from 13 sites during both flood and dry seasons were analyzed. It was observed that the PAHs concentration in dry season was higher than that in flood season in both water and surficial sediment, with 0.835 μg·L^-1 and 0.365 μg·L^-1in the water samples,and 2407 μg·kg^-1 and 1444 μg·kg^-1 in the surficial sediment samples, respectively. The major components were PAHs with 2~4 rings in both samples and the concentration of multiple rings PAH was significantly higher in surficial sediment samples than that in water samples. The concentration of PAHs in both samples at the middle section (from the Walled to the SouthGate) was significantly higher than those at the upper section (from the Thunder temple to the Fenhe Reservoir). The K_p values of sedimentary-water partition coefficients, during the flood and dry season, were 642~32345 L·kg^-1and 671~44929 L·kg^-1, respectively, and increased with the ring number of PAHs. The organic carbon normalized partition coefficient (lgK_oc) is higher than expected. The correlation coefficients (R²) of lgK_oc and lgK_ow in the flood and dry season were 0.764 and 0.725, respectively,while the slope of lgK_oc and lgK_ow dry season was greater than that of flood season, the same for the absorption of PAHs by surficial sediments. The K_p value showed positive correlation with the K_od(organic carbon in surficail sediments/COD_Cr in water), with the correlation coefficients (R²) 0.625 and 0.728 in flood and dry seasons, respectively, indicating that the K_p of PAHs is influenced by both the organic carbon in surface sediments and the COD_Cr in water.

• Key words：upper and middle section of the Fen River basin  PAHs  spatiotemporal distribution  distribution model

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