| 摘要: |
| 深圳湾, 毗邻香港, 是深圳经济特区的重要经济发展和生态调节区域。为了更好地了解该湾多溴联苯醚(PBDEs)的生物累积规律及其污染历史, 作者采集该海域19 个鱼、2 个虾、2 个蟹和柱状沉积物样品, 分析其中PBDE 的组分与含量, 以及生物体的δ15N同位素、总脂含量和柱状沉积物的沉积年龄(210Pb)、总有机碳(TOC)。结果表明, 深圳湾海域鱼类Σ15PBDEs 组分的残余量为21—167ng/g lw(或0.17—4.16 ng/g fw), 平均为(67±42) ng/g lw 或(2.00±1.14) ng/g fw, 其含量与生物体的δ15N同位素和脂含量正相关, BDE-47、BDE-100 为生物体中PBDE 最优势组分且在所有生物样品中均检出, 分别占46.5%、13.5%, 肉食性的鱼类较植食性的鱼类PBDEs 的生物累积总体上较高。柱状沉积物中Σ22 PBDEs 含量(0.07—4.85 ng/g dw)近二十几年来有明显的上升趋势, 平均沉积通量为0.25ng/(cm2·a) , 丰度最高的PBDE 组分为BDE-47、BDE-49、BDE-99、BDE-183(不包括BDE-209); PBDEs在生物体和柱状沉积物中的含量位于全球PBDEs 含量的中低端范围; 鱼类等生物体中PBDE 的生物-沉积物累积比值(BSAF)比值(<0.8)较小, 与相应的PBDE 的logKOW(辛醇/水分配比)存在一定的正相关性。
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| 关键词: 多溴联苯醚, δ15N 同位素, 生物累积, 柱状沉积物, 深圳湾 |
| DOI：10.11693/hyhz200903002002 |
| 分类号: |
| 基金项目:国家自然科学基金项目：40573061、40473041 号; 国家海洋局海洋公益性行业科研专项：200705026 号; 中国博士后科学基金资助项目：2005038505 号 |
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| BIOACCUMULATION AND HISTORICAL DEPOSITION OF POLYBROMINATED DIPHENYL ETHERS (PBDEs) IN SHENZHEN BAY |
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QIU Yao-Wen1,2, ZHANG Gan2, GUO Ling-Li2, Gene J Zheng3, LI Jun2, LIU Xiang2
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1.Key Laboratory of Tropic Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences;2.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences;3.Department of Biology and Chemistry, City University of Hong Kong
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| Abstract: |
| To study the bioaccumulation and their pollution history of polybrominated diphenyl ethers (PBDEs), 23 organisms (19 fishes, 2 shrimps and 2 crabs) and core sediments were collected to determine the concentrations of PBDE congeners in the Shenzhen Bay, Guangdong, South China. Stable isotope δ15N and lipid percentage in organism samples, the sedimentation age (using 210Pb) and total organic carbon (TOC) in the core sediments, were measured. The results showed that residue level of total 15 PBDE congeners in organisms in the bay ranged 21—167 ng/g lw or 0.17—4.16 ng/g fresh wt, in average of (67±42) ng/g lw or (2.00±1.14) ng/g fresh wt. Of PBDE, BDE-47 and BDE-100 were the predominant congener, and were found in all collected organisms, taking 46.5% and 13.5% respectively of total PBDE. The relationship between PBDE concentration and lipid percentage and δ15N value in the organisms was positive. The PBDE bioaccumulation was generally higher in carnivorous fish than planktivorous ones. Increasing trends in 22 PBDE congeners contents were observed from 0.07 to 4.85 ng/g dw in core sediment of the past two decades with average sedimentation flux of 0.25 ng/(cm2·a). The PBDE concentration in both the organisms and the sediments in the bay were within low-median range compared to those of the world. The organism-sediment accumulation factors (BSAF) in the study area were low (<0.8) and positively related with corresponding logKOW (partition ratios in octanol/water).
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| Key words: PBDEs, δ15N isotope, Bioaccumulation, Core sediment, Shenzhen Bay |
