University of Chinese Academy of Sciences, Beijing, 100049, China.
State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, P. O. Box 2871, Beijing, 100085, China.
Environ Sci Pollut Res Int. 2018 Aug;25(23):23195-23204. doi: 10.1007/s11356-018-2337-z. Epub 2018 Jun 3.
The phosphorus (P)-buffering ability of suspended particulate matter (SPM) from the Ziya River Mainstream (ZRM) and the Luanhe River (LR) of northern China was investigated in this study. Forty samples of SPM from the ZRM and LR were collected in October and November of 2016. The ZRM has slow flow and poor water quality, while the LR has fast flow and reasonably good water quality. Under a scanning electron microscope, the SPM from the ZRM had a more complex microstructure than that from the LR, perhaps because of the slower flow and heavier pollution in the ZRM. P fractions in both SPM and water samples were determined using standard measurement and testing program methods. The equilibrium P concentration was used to determine the influence of SPM on soluble reactive P (SRP) concentrations. These SRP fractions were used to evaluate the P-buffering intensity of the two rivers. Differences in SPM microstructure resulted in the SPM from ZRM having a stronger P-buffering ability than the LR, making SPM an effective vector for SRP. Anthropogenic activities likely contributed to the differences in both microstructures of the SPM and P-buffering intensity of the rivers. A conceptual model was developed to show how anthropogenic activities influence the P-buffering intensity of the two rivers. As far as we know, this is the first time that the P-buffering intensity has been compared between two rivers that have been severely impacted by anthropogenic activities. Our findings provide an important reference for similar rivers worldwide.
本研究调查了中国北方子河干流 (ZRM) 和滦河 (LR) 的悬浮颗粒物 (SPM) 的磷 (P) 缓冲能力。2016 年 10 月和 11 月采集了来自 ZRM 和 LR 的 40 个 SPM 样本。ZRM 水流缓慢，水质较差，而 LR 水流较快，水质较好。在扫描电子显微镜下，ZRM 的 SPM 具有比 LR 更复杂的微观结构，这可能是由于 ZRM 水流缓慢且污染较重。使用标准测量和测试程序方法测定 SPM 和水样中的 P 分数。平衡 P 浓度用于确定 SPM 对可溶性反应性 P (SRP) 浓度的影响。这些 SRP 分数用于评估两条河流的 P 缓冲强度。SPM 微观结构的差异导致 ZRM 的 SPM 具有比 LR 更强的 P 缓冲能力，使 SPM 成为 SRP 的有效载体。人为活动可能导致 SPM 的微观结构和河流 P 缓冲强度的差异。建立了一个概念模型来展示人为活动如何影响两条河流的 P 缓冲强度。据我们所知，这是首次对两条受到人为活动严重影响的河流的 P 缓冲强度进行比较。我们的研究结果为全球类似河流提供了重要参考。
