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首页> 外文期刊>Estuarine Coastal and Shelf Science >Selenium biogeochemistry in the San Francisco Bay estuary: changes in water column behavior
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Selenium biogeochemistry in the San Francisco Bay estuary: changes in water column behavior

机译：旧金山湾河口的硒生物地球化学：水柱行为的变化

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The cycling of dissolved selenium was examined in the North San Francisco Bay estuary using 5 surface water transects from the Pacific Ocean (Golden Gate) to the Sacramento and San Joaquin Rivers, monthly river sampling, and three collections of oil refinery effluents during 1997-2000. By combining these data with earlier results from the mid-1980s, a nearly 16-year record of riverine fluxes, estuarine processes, and anthropogenic inputs was obtained. The Sacramento River concentrations and speciation have remained unchanged over the period, and while the speciation of selenium in the San Joaquin is similar, its dissolved selenium concentrations have decreased by almost one half. More significantly, the concentration of selenium from oil refinery discharges to the mid-estuary has decreased 66% and its speciation changed from one dominated by selenite (66%) to one that is only 14% selenite. This change in refinery effluents occurred while our study was underway, with the result being a pronounced decrease in selenite concentrations (82%), and hence total dissolved selenium, in the mid-estuary. A companion study found that sediment/ water exchange is a minor flux to the estuary, and hence selenium inputs from the Sacramento River, as well as refineries during low flow (summer, fall) periods exert major controls on the dissolved selenium behavior in this estuary. Nevertheless, in situ processes associated with organic matter cycling (photosynthesis and respiration) still modify the distributions and internal transformations of dissolved selenium, notably organic selenide.
机译：使用从太平洋（金门）到萨克拉曼多和圣华金河的5个地表水样，在北旧金山湾河口检查了溶解的硒的循环，在1997-2000年期间进行了每月河水采样以及三个炼油厂废水收集。通过将这些数据与1980年代中期的早期结果相结合，获得了近16年的河流通量，河口过程和人为输入的记录。萨克拉曼多河的浓度和形态在此期间保持不变，尽管圣华金中硒的形态相似，但其溶解的硒浓度却下降了近一半。更重要的是，从炼油厂排放到河口中段的硒的浓度下降了66％，其形态从一种以亚硒酸盐为主的硒（66％）变为仅一种亚硒酸盐的14％。炼油厂废水的这种变化发生在我们的研究进行中，结果导致河口中段亚硒酸盐浓度（82％）显着下降，因此总溶解硒下降。一项伴随研究发现，沉积物/水的交换是河口的少量通量，因此萨克拉曼多河以及低流量（夏季，秋季）期间精炼厂的硒输入对该河口中溶解的硒行为具有主要控制作用。 。然而，与有机物循环（光合作用和呼吸作用）相关的原位过程仍会改变溶解硒（尤其是有机硒化物）的分布和内部转化。

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