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Relative importance of organic- and iron-based colloids in six Nova Scotian lakes
npj Clean Water ( IF 11.4 ) Pub Date : 2021-04-09 , DOI: 10.1038/s41545-021-00115-4
Lindsay E. Anderson , Benjamin F. Trueman , Dewey W. Dunnington , Graham A. Gagnon

Dissolved organic matter (DOM) concentrations have been increasing in parts of the northern hemisphere for several decades. This process—brownification—often accompanies increasing iron and aluminum, but the metal–DOM interactions these concurrent trends imply are poorly described. Here we used field-flow fractionation with UV and ICP-MS detection to measure the size distribution of colloidal iron, aluminum, manganese, copper, uranium, and chromophoric DOM in six lakes over six months. Five of these lakes have browned to some degree in the past three decades, with linear increases in organic carbon and color ranging from 0.01 to 0.13 mg C L−1 yr−1 and 0.13–1.94 PtCo yr−1. Browning trends were more pronounced and colloids more abundant in lakes with wetlands in their catchments. Iron and aluminum were present in two primary fractions, sized nominally at 1 and 1000 kDa. The 1 kDa fraction included the primary DOM signal, while the 1000 kDa fraction absorbed minimally at 254 nm and likely represents iron-rich (oxyhydr)oxides. Colloidal manganese was sized at 1000+ kDa, whereas colloidal copper and uranium occurred primarily at 1 kDa. These associations fit with a pattern of increasing DOC, iron, aluminum, and color in the region’s lakes. They represent a significant challenge for drinking water treatment systems, especially those in remote communities. Given that browning trends are expected to continue, monitoring plans would better inform treatment process design and operation by characterizing DOM and iron-rich, primarily inorganic colloids that contribute to adverse water quality outcomes.



中文翻译:

在六个新斯科舍湖中有机和铁基胶体的相对重要性

几十年来,北半球部分地区的溶解有机物(DOM)浓度一直在增加。铁和铝的增加通常伴随着这种过程(棕色化),但是这些并发趋势所暗示的金属与DOM相互作用的描述却很少。在这里,我们使用场流分级分离和UV和ICP-MS检测技术,在六个月的六个湖泊中测量了胶体铁,铝,锰,铜,铀和发色DOM的尺寸分布。在过去的三十年中,这些湖泊中有五个已经褐化到一定程度,有机碳和颜色的线性增加范围为0.01到0.13 mg CL -1 yr -1和0.13-1.94 PtCo yr -1。在流域内有湿地的湖泊中,褐变趋势更加明显,胶体更加丰富。铁和铝以两个主要部分存在,标称大小分别为1和1000 kDa。1 kDa馏分包括主要的DOM信号,而1000 kDa馏分在254 nm处吸收最少,并且可能代表富铁(羟基氧化物)。胶体锰的尺寸为1000+ kDa,而胶体铜和铀的含量主要为1 kDa。这些联系与该地区湖泊中DOC,铁,铝和颜色增加的模式相吻合。对于饮用水处理系统,尤其是偏远社区的饮用水处理系统,它们构成了巨大的挑战。鉴于褐变趋势预计将持续,因此监测计划将通过表征DOM和富铁来更好地指导处理工艺的设计和操作,

更新日期:2021-04-09
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