Relative importance of organic- and iron-based colloids in six Nova Scotian lakes

Abstract 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...

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Autores principales:	Lindsay E. Anderson, Benjamin F. Trueman, Dewey W. Dunnington, Graham A. Gagnon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/83e5af0b7669404a82b3c9c0ca601af5
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spelling	oai:doaj.org-article:83e5af0b7669404a82b3c9c0ca601af52021-12-02T14:21:10ZRelative importance of organic- and iron-based colloids in six Nova Scotian lakes10.1038/s41545-021-00115-42059-7037https://doaj.org/article/83e5af0b7669404a82b3c9c0ca601af52021-04-01T00:00:00Zhttps://doi.org/10.1038/s41545-021-00115-4https://doaj.org/toc/2059-7037Abstract 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.Lindsay E. AndersonBenjamin F. TruemanDewey W. DunningtonGraham A. GagnonNature PortfolioarticleWater supply for domestic and industrial purposesTD201-500ENnpj Clean Water, Vol 4, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Water supply for domestic and industrial purposes TD201-500
spellingShingle	Water supply for domestic and industrial purposes TD201-500 Lindsay E. Anderson Benjamin F. Trueman Dewey W. Dunnington Graham A. Gagnon Relative importance of organic- and iron-based colloids in six Nova Scotian lakes
description	Abstract 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.
format	article
author	Lindsay E. Anderson Benjamin F. Trueman Dewey W. Dunnington Graham A. Gagnon
author_facet	Lindsay E. Anderson Benjamin F. Trueman Dewey W. Dunnington Graham A. Gagnon
author_sort	Lindsay E. Anderson
title	Relative importance of organic- and iron-based colloids in six Nova Scotian lakes
title_short	Relative importance of organic- and iron-based colloids in six Nova Scotian lakes
title_full	Relative importance of organic- and iron-based colloids in six Nova Scotian lakes
title_fullStr	Relative importance of organic- and iron-based colloids in six Nova Scotian lakes
title_full_unstemmed	Relative importance of organic- and iron-based colloids in six Nova Scotian lakes
title_sort	relative importance of organic- and iron-based colloids in six nova scotian lakes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/83e5af0b7669404a82b3c9c0ca601af5
work_keys_str_mv	AT lindsayeanderson relativeimportanceoforganicandironbasedcolloidsinsixnovascotianlakes AT benjaminftrueman relativeimportanceoforganicandironbasedcolloidsinsixnovascotianlakes AT deweywdunnington relativeimportanceoforganicandironbasedcolloidsinsixnovascotianlakes AT grahamagagnon relativeimportanceoforganicandironbasedcolloidsinsixnovascotianlakes
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Relative importance of organic- and iron-based colloids in six Nova Scotian lakes

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