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Insight into the relationships between total suspended particles and mercury in meltwater in a typical glacierized basin in the inland Tibetan Plateau
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2023-03-22 , DOI: 10.1016/j.jhazmat.2023.131250
Xuejun Sun 1 , Qianggong Zhang 2 , Mingyue Li 3 , Jie Wang 3 , Zijian Lu 3 , Junming Guo 4 , Shichang Kang 5 , Jianbo Shi 6
Affiliation  

Mercury (Hg) released by melting glaciers is likely to bind to suspended particles in meltwater runoff, posing potential risks to downstream ecosystems. The rapidly receding glaciers on the Tibetan Plateau promote the export of total suspended particles (TSP), increasing the uncertainty of Hg export released by glacier melting. To investigate the relationships between TSP and Hg, a multimedia sampling campaign was conducted in July 2020 in the Kuoqionggangri glacier region of the Lhasa River Valley No. 1 glacierized basin located in the inland Tibetan Plateau. Samples from glacier snow/ice, supraglacial rivers, subglacial rivers, proglacial lakes, and meltwater runoff were obtained, and the relationships between TSP and Hg and their transport in glacier meltwater runoff in the context of glacier retreat were explored. The average TSP concentration of different environmental samples ranged from 9.51 mg/L to 399. 27 mg/L, showing significant differences. The average total Hg (THg) concentrations ranged from 0.52 ng/L to 58.81 ng/L and decreased in the order of snow/ice >runoff> subglacial river > proglacial lake > supraglacial river. Both TSP mass concentration and number concentration have an impact on the diurnal variation in meltwater runoff Hg, and the influence of TSP number concentration is stronger than that of concentration. Sites with high TSP concentrations and quantities tended to have higher Hg concentrations, while TSP particle size had no significant effect on Hg concentration or spatial distribution. Our study further divided the glacier recharge basin into the glacier cover zone, the periglacial zone, and the downstream zone and discussed the potential impact of TSP on Hg transport in each zone. Our analysis highlights that the periglacial zone will expand and activate the resuspension process of river sediments in the warming future, which may increase the export of TSP and Hg downstream.



中文翻译:

青藏高原内陆典型冰川化盆地融水中总悬浮颗粒物与汞的关系研究

冰川融化释放的汞 (Hg) 可能会与融水径流中的悬浮颗粒结合,对下游生态系统构成潜在风险。青藏高原快速消退的冰川促进了总悬浮颗粒物(TSP)的输出,增加了冰川融化释放的Hg输出的不确定性。为研究 TSP 与 Hg 之间的关系,2020 年 7 月在位于青藏高原内陆的拉萨河流域第一冰川化盆地的阔琼岗日冰川区开展了多媒体采样活动。从冰川雪/冰、冰上河流、冰下河流、冰川湖泊和融水径流中获取样本,并探讨了冰川退缩背景下 TSP 和 Hg 之间的关系及其在冰川融水径流中的传输。不同环境样品的平均TSP浓度范围为9.51 mg/L至399. 27 mg/L,差异显着。平均总汞(THg)浓度范围为0.52 ng/L至58.81 ng/L,并按雪/冰>径流>冰下河流>冰川湖>冰上河流的顺序降低。TSP质量浓度和数量浓度均对融水径流Hg的日变化有影响,TSP数量浓度的影响大于浓度。TSP 浓度和数量较高的地点往往具有较高的 Hg 浓度,而 TSP 粒径对 Hg 浓度或空间分布没有显着影响。我们的研究进一步将冰川补给盆地划分为冰川覆盖带、冰缘带、和下游区域,并讨论了 TSP 对每个区域汞运输的潜在影响。我们的分析强调,在变暖的未来,冰缘带将扩大并激活河流沉积物的再悬浮过程,这可能会增加下游 TSP 和 Hg 的输出。

更新日期:2023-03-22
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