太湖蓝藻聚集区沉积物硫形态的时空变异特征.PDFVIP

中国环境科学 2017,37(12) ：4690~4700 China Environmental Science 太湖蓝藻聚集区沉积物硫形态的时空变异特征 朱瑾灿 1,2,吴雨琛 3,尹洪斌 1* (1. 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,江苏 南京 210008 ；2. 中国科学院大学,北京 100049 ；3.江南大学食品学院,江苏 无锡 214122) 摘要： 以太湖竺山湾蓝藻聚集区沉积物为对象,通过季节性采样,借助硫形态提取与硫同步辐射技术(S-XANES),对沉积物内硫形态分布特 征进行研究.结果表明,沉积物中硫分布具有明显的季节性波动特征,夏季沉积物中还原性硫含量要显著高于春季.硫形态提取结果显示,聚 藻区沉积物中酸可挥发性硫、黄铁矿硫的平均浓度分别是非聚藻区的 12.7、4.16 倍,表明蓝藻聚集有利于还原性硫的产生.S-XANES 分析 结果也表明聚藻区沉积物内 FeS 、FeS2 和 ES 的平均百分比含量明显高于非聚藻区.结合对比两种硫分析方法,可以发现聚藻区内强还原环 境会使沉积物中硫优先还原为硫化亚铁,有利于向稳定态铁硫化物黄铁矿的转化.聚藻区沉积物内腐殖质硫(HS+FS) 的平均含量是非聚藻 区的 1.53 倍,且以硫醇、硫醚等还原态有机硫为主.上述研究表明,聚藻区沉积物中还原性硫和有机硫组分的含量均明显高于非聚藻区,可能 是导致水体黑臭事件发生的主要诱因之一,应加大对聚藻区沉积物的治理. 关键词：沉积物；聚藻区；酸可挥发性硫；太湖 中图分类号：X524 文献标识码：A 文章编号：1000-6923(2017)12-4690-11 Temporal and spatial variations of sulfur speciations in the sediments of algae accumulation area in Lake Taihu. ZHU Jin-can1,2 3 1* , WU Yu-chen , YIN Hong-bin (1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China ；2.University of Chinese Academy of Sciences, Beijing 100049, China ；3.School of Food Science and Technology, Jiangnan University, Wuxi 214122, China). China Environmental Science, 2017,37(12)：4690~4700 Abstract ：The variation of sulfur (S) in the sediment has been proven to be closely related with the break of black and odorous water incidents in various previous studies. However, information on the variations of S speciations in the sediments of algae accumulation area, which is also black and odorous prone area, was still limited. In this study, sediment cores were seasonally sampled from the Zhushan Bay, which is an algae accumulation aera in Lake Taihu. The s