Occurrence,Spatial Distribution,Sources and Risk Assessment of Per-and Polyfluoroalkyl Substances in Surface Sediments of the Yellow River Delta Wetland

Per-and polyfluoroalkyl substances(PFASs)are emerging persistent organic pollutants(POPs).In this study,47 surface sediment samples were collected from the Yellow River Delta wetland(YRDW)to investigate the occurrence,spatial distribution,potential sources,and ecological risks of PFASs.Twenty-three out of 26 targeted PFASs were detected in surface sediment samples from the YRDW,with totalΣ23PFASs concentrations ranging from 0.23 to 16.30 ng g^(-1) dw and a median value of 2.27 ng g^(-1) dw.Perfluorooctanoic acid(PFOA),perfluorobutanoic acid(PFBA)and perfluorooctanesulfonic acid(PFOS)were the main contaminants.The detection frequency and concentration of perfluoroalkyl carboxylic acids(PFCAs)were higher than those of perfluoroal-kanesulfonic acids(PFSAs),while those of long-chain PFASs were higher than those of short-chain PFASs.The emerging PFASs substitutes were dominated by 6:2 chlorinated polyfluoroalkyl ether sulfonic acid(6:2 Cl-PFESA).The distribution of PFASs is significantly influenced by the total organic carbon content in the sediments.The concentration of PFASs seems to be related to human activities,with high concentration levels of PFASs near locations such as beaches and villages.By using a positive matrix factorization model,the potential sources of PFASs in the region were identified as metal plating mist inhibitor and fluoropolymer manufacturing sources,metal plating industry and firefighting foam and textile treatment sources,and food packaging material sources.The risk assessment indicated that PFASs in YRDW sediments do not pose a significant ecological risk to benthic organisms in the region overall,but PFOA and PFOS exert a low to moderate risk at individual stations.

东海内陆架岩心中木质素的沉积记录

通过对东海内陆架T06岩心样品中木质素的测定,依据木质素参数对古环境、古气候的指示作用,探究了陆源有机碳在该区域的沉积记录,以及8.8 ka B.P.以来浙闽沿岸在不同历史环境下有机物的输送机制。研究结果显示,东海内陆架海域东亚冬季风驱动的水动力输送对沉积物中木质素酚类单体的含量变化及其相关参数起着至关重要的调控作用;反之,木质素含量及其相关参数可以在一定程度上指示东亚冬季风的变化,可能是重建东亚冬季风的可靠指标。本研究还发现,木质素相关参数剧烈波动的“50年”时期,可能是由于气候变化和长江流域洪水不断,导致大量非木本被子植物残渣和表层土壤的输入,并最终在水动力和洋流作用下沉积埋藏。

黄河三角洲水资源承载力与生产力布局协调关系研究

黄河三角洲先天本底条件和后天发展状况决定了黄河三角洲区域属于贫水区。介绍了黄河三角洲地区山东省东营市市域水资源量及其时空分布特点,总结分析了水资源开发利用概况和约束条件。依据2010—2021年相关统计规划资料和部分研究成果,进一步明确了东营市域的生产力布局特征、水资源承载力状况以及生产力布局与水资源的协调关系,指出了东营市当前生产力布局与水资源承载力之间所存在的突出矛盾和问题,提出了今后一段时期内基于水资源集约节约利用的优化生产力布局的策略和建议。

Sources and Transport of Terrigenous Organic Matters Along the East China Sea Inner Shelf: Insights from Lignin and Alkane Biomarkers

The area of East China Sea(ECS)inner shelf is an important sink of suspended particulates from Yangtze River(YR)and materials originated from YR basin.In this study,the parameters of lignin and alkane biomarkers in surface sediment samples from ECS inner shelf were determined to distinguish the sources and to trace the transport of terrigenous organic matters in the region.Our dataset showed that total alkanes with carbon numbers from 10 to 38(T-alkanes)were significantly correlated to both TAR(terrigenous/aquatic ratio)and HMW/LMW(the ratio of high molecular weight to low molecular weight alkanes)(r=0.88,P<0.05 for both),indicating that the majority of T-alkanes was predominantly originated from terrestrial sources,and T-alkanes are important constituents of terrestrial organic matters in the study area.The area was probably affected by petroleum pollution to a certain degree,as indicated by the values of carbon preference index(CPI),odd-over-even carbon number predominance(OEP)and the ratio of pristane to phytane(Pr/Ph).The values of Pr/n-C_(17) and Ph/n-C_(18) suggested a strong reductive sedimentary condition in the region with no obvious biodegradation.The content of eight lignin phenols(Σ8)decreased from the coast to the open sea,indicative of riverine input and hydrodynamic transport of terrigenous organic matters.Lignin degradation parameters presented an increasing trend from the coastline toward the open sea.The lignin vegetation parameters and alkane index(AI)suggested the predominance of non-woody angiosperms in the YR basin.The obvious correlation betweenΛ8(Σ8 normalized to 100 mg organic carbon),TAR and HMW/LMW reveals the significantly concurrent input of lignin and alkanes from terrestrial sources.

黄河三角洲近海典型石油类污染物的毒性效应及其生物富集的研究进展

胜利油田地处黄河下游的山东省东营市,是我国第二大石油产区,与黄河三角洲紧密相连。随着胜利油田的开发建设及航运的迅猛发展,黄河三角洲近海地区必将受到石油污染。石油中含有多种有机成分,如蒽、萘、菲等多环芳烃和环烷酸、苯并[a]芘等典型污染物,具有显著的致癌、致畸以及致基因突变特性,这些石油类污染物质会对海洋环境系统、海洋生物及微生物造成巨大危害。因此,对黄河三角洲近海中典型石油类污染物的毒性效应及生物富集的研究尤为重要。本文综述了典型石油类污染物对黄河三角洲近海海域中不同生物层次的毒性效应及生物富集研究进展,进而探明了典型石油类污染物对海洋生物的毒性效应、生物富集的相关机理,对后续海洋溢油风险评估、生态系统稳定及人类生命健康具有重大作用。