State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P. O. Box 2871, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P. O. Box 2871, Beijing, 100085, China.
Chemosphere. 2018 Jul;202:521-529. doi: 10.1016/j.chemosphere.2018.03.139. Epub 2018 Mar 21.
To investigate the characteristics of suspended particulate matter (SPM) in rivers of northern China, SPM was collected from 20 sampling sites within the severely polluted slow-moving Ziya River Mainstream (ZRM) and from 20 sampling sites within the less-polluted fast-moving Luanhe River (LR) between October and November of 2016. Physical and chemical attributes of river water from the ZRM and LR were measured; the microstructure, specific surface area and particle size of the SPM were also determined. The SPM had thicker organic coated layers on inorganic particles within the ZRM, compared with the LR, indicating strong interaction of the SPM with the water column. Along the ZRM length, these organic coated layers evolved, first plugging particle pores and then increasing in volume, causing the specific surface area to decrease at first and then increase. The presence of organic coated layers on inorganic particles greatly changed their particle size, density and inducing changes in their motion behavior. Such changes in SPM microstructure were most apparent in the slow-moving polluted ZRM. Given that SPM can adsorb contaminants, such as phosphorus and heavy metals, onto its surfaces and transport them downstream, these changes could have a profound impact on both sediment transport and river ecosystem function. Our results suggest we need to reevaluate our previous river management measures for slow-moving polluted rivers.
为研究中国北方河流中悬浮颗粒物（SPM）的特征，于 2016 年 10 月至 11 月，在重度污染的缓流子牙河干流（ZRM）的 20 个采样点和污染较轻的快速流动的滦河（LR）的 20 个采样点采集了 SPM。测量了 ZRM 和 LR 河水的物理化学性质；还测定了 SPM 的微观结构、比表面积和颗粒大小。与 LR 相比，ZRM 中的 SPM 无机颗粒上的有机覆盖层更厚，这表明 SPM 与水柱之间存在强烈的相互作用。沿 ZRM 长度，这些有机覆盖层逐渐演变，先是堵塞颗粒孔隙，然后体积增大，导致比表面积先减小后增大。无机颗粒上有机覆盖层的存在极大地改变了它们的粒径、密度，并引起其运动行为的变化。这种 SPM 微观结构的变化在缓慢流动的污染 ZRM 中最为明显。鉴于 SPM 可以将污染物（如磷和重金属）吸附到其表面并将其向下游输送，这些变化可能会对泥沙输移和河流生态系统功能产生深远影响。我们的研究结果表明，我们需要重新评估我们之前对缓慢流动的污染河流的管理措施。
