Chemistry and Environment Science College of Inner Mongolia Normal University, Hohhot, 010022, China.
Key Laboratory of Environmental Chemistry of Inner Mongolia, Hohhot, 010022, China.
Environ Sci Pollut Res Int. 2021 Jan;28(4):4623-4633. doi: 10.1007/s11356-020-10722-2. Epub 2020 Sep 18.
Species of Fe in the sediments from 21 sections of the Yellow River have been analyzed utilizing the so-called sequential extraction approach. The correlation between iron and phosphorus was analyzed, and the risk of release phosphorus was predicted. The results show that the content of residual iron (Fe) in the sediments is the highest, accounting for more than 92.55% of total iron (∑Fe) (the sum of the iron contents in each form is the total iron). Ca-bound phosphorous (P) is equal to the sum of authigenic calcium and phosphorus (P) and detritus calcium phosphorus (P), accounting for more than 73.01% of ∑P, in which P accounts for more than 90.91% of P, which is the main component of P and the main component of ∑P; Fe in sediments is closely related to P, and Fe is closely related to P and P, which is an important factor to control the release of endogenous phosphorus. The extremely significant positive correlation between Fe and P and P in sediments is that they are affected by complex geological conditions in the Yellow River Basin. Judging by the ratio of ∑Fe/∑P combined with the influence of human factors, the release of phosphorus in sediments of most reaches of the Yellow River is controlled by iron, while the release of phosphorus is inhibited. Sediments in Xigu section H4, Zhongwei section H5, Haibowan section H7, three Sanshenggong section H8, Liulin section H13, and Tongguan section H16 of the Yellow River have certain phosphorus release risks, because phosphorus release is not only controlled by iron but also influenced by human factors, such as industrial and agricultural production level and artificial dam construction.
黄河 21 个断面沉积物中的铁形态采用连续提取法进行分析，分析了铁与磷的相关性，并预测了磷的释放风险。结果表明，沉积物中残渣态铁（Fe）含量最高，占总铁（∑Fe）的 92.55%以上（各形态铁含量之和为总铁）。钙结合态磷（P）等于自生钙磷（P）和碎屑钙磷（P）之和，占∑P 的 73.01%以上，其中 P 占 P 的 90.91%以上，是 P 的主要组成部分，也是∑P 的主要组成部分；沉积物中的铁与 P 密切相关，与 P 和 P 密切相关，是控制内源磷释放的重要因素。沉积物中 Fe 与 P 和 P 之间存在极显著的正相关关系，这是受黄河流域复杂地质条件的影响。从∑Fe/∑P 的比值结合人为因素的影响来看，黄河大部分河段沉积物中磷的释放受铁的控制，而磷的释放受到抑制。黄河西固段 H4、中卫段 H5、海勃湾段 H7、三盛宫段 H8、柳林段 H13、潼关段 H16 等河段的沉积物存在一定的磷释放风险，因为磷释放不仅受铁的控制，还受人为因素的影响，如工农业生产水平和人工坝的建设。
