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盐度和总悬浮固体控制潮河中的物种:与光化学模型进行比较

Rachel G Clarke¹, Sara J Klapstein¹, Robert Keenan²

¹. Department of Earth & Environmental Science. Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada.

|September 29, 2023

概括

气态元素的白天挥发会从水生系统中去除. 悬浮固体限制了光还原,但海洋混合可能会在潮河口附近增强光还原.

科学领域:

环境化学环境化学
水银生物地质化学水银生物地质化学
水生生态系统水生生态系统

背景情况:

气态元素 (Hg(0) _aq) 的白天挥发是水生环境中一个关键的去除途径.
这个过程可能会影响甲基的产生和生物积累.
了解影响Hg(0)_aq的因素对于命运和运输研究至关重要.

研究的目的:

为了研究太阳辐射,溶解有机物,盐度和悬浮颗粒在白天对物种的影响.
在高潮河口附近同时测量气态元素 (Hg(0) _aq和其他形式 (THg,ERM,THg_TSS).
为了比较测量的Hg(0)_aq与经验模型的预测,并评估物种的光降解性.

主要方法:

同时测量太阳辐射 (紫外线),溶解有机物,盐度和总悬浮颗粒.
物种的量化:Hg(0) _aq,溶解的总 (THg),容易降解的 (ERM),以及与总悬浮固体相关的 (THg_TSS).
现场数据与Hg(0)_aq预测的既定实证模型进行比较.

主要成果:

在未过的表面水中没有观察到Hg0_aq的可预测时间变化,其度从0到12 pg L-1不等.
总 (THg) 范围从0到492 pg L-1 ,易降解 (ERM) 从13到381 pg L-1 ,以及悬浮固体上的 (THg TSS) 从1.58 ng g-1到261.32 ng g-1.
悬浮固体显著限制紫外线的传输,抑制Hg(0) _aq的产生. 在ERM度并不能可靠地预测in-situ光降解Hg.

结论:

对于光还原的可用性在潮河口附近比经验模型预测的要高.
悬浮固体的高度通过限制紫外线透来抑制光降解.
由于海洋混合而减少的悬浮固体,预计将促进快速的Hg (II) 光还原.

关键词:

芬迪湾 (Bay of Fundy) 的一个海湾.溶解的有机物质是有机物质.河口的河口河口光电还原是指光电还原的方法.盐分盐分盐分盐分盐分总悬浮固体总量悬浮固体总量

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