摘要
应用连续浸提技术研究了黄河内蒙古段表层沉积物中硅的赋存形态及沿程分布特征。结果表明,沉积物中残渣态硅(Residual-Si)含量最高,占5种硅形态总量(∑Si)的91.78%(质量分数,下同)~98.08%,但Residual-Si对上覆水影响不大,其余4种硅形态均为生物有效硅(Valid-Si),Valid-Si仅占∑Si的1.92%~8.22%,但对黄河水体硅循环具有重要影响。人工筑坝会导致水体总颗粒物(TMP)浓度减少,使大坝下游沉积物中可交换态硅(IEF-Si)、碳酸盐结合态硅(CF-Si)和上覆水溶解硅(DSi)含量明显降低;旅游景点和电厂产生的人为污染会通过大气沉降和地表径流等进入到水体,使水体营养程度进一步升高,浮游植物在沉积物中汇集,导致下游沉积物IEF-Si、CF-Si含量升高,增加沉积物中硅的释放风险。
Sequential extraction method was used to study the forms and distribution characteristics of silicon in the surface sediments of the Yellow River in Inner Mongolia.The result showed that the concentration of residual Si(Residual-Si)was the highest in the sediments,mass fraction accounting for 91.78%-98.08%of total 5 silicon forms(∑Si),but Residual-Si had little effect on the overlying water;the other four types of silicon were bioavailability(Valid-Si),which only accounted for 1.92%-8.22%of(∑Si),but it had an important impact on the silicon cycle of the Yellow River.Artificial dams reduced the concentration of total suspended particulate(TMP)in the water body,which reduced the concentrations of exchangeable Si(IEF-Si),carbonate bounded Si(CF-Si)of sediments and dissolvable Si(DSi)of overlying water in the downstream of the dam.The anthropogenic pollution of tourist attractions and power plants would enter into the water body through atmospheric deposition and surface runoff.These anthropogenic pollutions could increase the nutrient level of water body and further cause more phytoplankton gather in the sediments,increasing the concentrations of IEF-Si and CF-Si in the downstream sediments,and increasing the risk of Si release from the sediments accordingly.
作者
田初晨
杨宏伟
TIAN Chuchen;YANG Hongwei(Inner Mongolia Key Laboratory of Environmental Chemistry,College of Chemistry and Environmental Science,Inner Mongolia Normal University,Hohhot Inner Mongolia 010022)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2020年第4期432-436,共5页
Environmental Pollution & Control
基金
国家自然科学基金重点资助项目(No.21337003)
国家自然科学基金资助项目(No.41865010)
内蒙古自治区高等学校科学研究项目(No.2016ZRYB010)。
关键词
黄河内蒙古段
沉积物
硅形态
分布特征
大坝
Inner Mongolia stretch of Yellow River
sediment
silicon form
distribution characteristics
dam
