谷晓悦, 丁光辉, 薛欢欢, 张晶, 姚子伟, 王莹, 葛林科. 基于逸度方法分析大连湾海域PFASs在海水-沉积物界面的扩散趋势[J]. 海洋环境科学, 2020, 39(3): 353-358. DOI: 10.12111/j.mes20200305
引用本文: 谷晓悦, 丁光辉, 薛欢欢, 张晶, 姚子伟, 王莹, 葛林科. 基于逸度方法分析大连湾海域PFASs在海水-沉积物界面的扩散趋势[J]. 海洋环境科学, 2020, 39(3): 353-358. DOI: 10.12111/j.mes20200305
GU Xiao-yue, DING Guang-hui, XUE Huan-huan, ZHANG Jing, YAO Zi-wei, WANG Ying, GE Lin-ke. Fugacity approach to evaluate sediment-seawater diffusion of perfluoroalkyl substances in the Dalian bay[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2020, 39(3): 353-358. DOI: 10.12111/j.mes20200305
Citation: GU Xiao-yue, DING Guang-hui, XUE Huan-huan, ZHANG Jing, YAO Zi-wei, WANG Ying, GE Lin-ke. Fugacity approach to evaluate sediment-seawater diffusion of perfluoroalkyl substances in the Dalian bay[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2020, 39(3): 353-358. DOI: 10.12111/j.mes20200305

基于逸度方法分析大连湾海域PFASs在海水-沉积物界面的扩散趋势

Fugacity approach to evaluate sediment-seawater diffusion of perfluoroalkyl substances in the Dalian bay

  • 摘要: 研究污染物在沉积物-水界面的扩散趋势对于开展其环境风险评估具有重要作用。本研究基于大连湾海域海水和沉积物样品中全氟烷基化合物(PFASs)的含量数据,应用变异系数(Cv)分析了浓度分布的空间变异程度,应用逸度分数(ff)分析了PFASs在沉积物-水界面扩散趋势,应用响应系数(RC)分析了有机碳含量对扩散趋势的影响。结果表明:大连湾海域海水和沉积物中9种PFASs的总浓度均为中等变异;在沉积物中的浓度空间差异略大,可能受历史排放污染物残留及污染事故的影响。在海水-沉积物界面扩散过程中,全氟烷基磺酸类和全氟烷基羧酸类化合物呈现相同的扩散特性,总体表现为ff值随PFASs链长的增加而逐渐降低的趋势。短链PFASs在大连湾海域倾向于存在于水体中,而长链PFASs倾向于扩散到沉积物中。有机碳是影响PFASs在沉积物-水界面扩散趋势的重要参数,且对长链PFASs的影响更明显。全氟辛烷磺酸作为一种持久性有机污染物在大连湾海域中主要处于平衡状态。

     

    Abstract: Investigation on the diffusion trend of pollutants at the sediment-water interface is very valuable for their environmental risk assessment.Based on concentrations of perfluoroalkyl compounds (PFASs) in seawater and sediment samples from the Dalian bay, the diffusion trend of PFASs at the sediment-water interface and the spatial variability of PFASs were investigated by using the fugacity fraction (ff) and the coefficient of variation (Cv), respectively.Furthermore, the effect of organic carbon content on the diffusion trend was analyzed with the response coefficient (RC).The results show that the total concentration of 9 PFASs in seawater and sediments of Dalian Bay is moderately variable.The variation of concentration in the sediment was slightly larger, which might be affected by historical pollutants and pollution accidents.During the diffusion process at the sediment-water interface, the perfluoroalkyl sulfonic acids and perfluoroalkyl carboxylic acids exhibited the similar diffusion characteristics that was the ff value gradually decreased with increasing chain length of PFASs.Short-chain PFASs tended to exist in seawater of the Dalian bay, while the long-chain PFASs tended to diffuse into sediments.The organic carbon content is an important parameter affecting the diffusion trend of PFASs at the sediment-water interface, and the effect on long-chain PFASs was more obvious than that on short-chain PFASs.As a kind of persistent organic pollutant, PFOS is mainly in equilibrium at present in the Dalian bay.

     

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