Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea

Abstract The iron binding capacities (IBC) of fulvic acid (FA) and humic acid (HA) were determined in the salinity range from 5 to 40. The results indicated that IBC decreased while salinity increased. In addition, dissolved iron (dFe), FA and HA were also determined along the Yangtze River estuary’...

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Autores principales:	Rujun Yang, Han Su, Shenglu Qu, Xuchen Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bde86bd615d54773ab2ac3e4de843c8c
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spelling	oai:doaj.org-article:bde86bd615d54773ab2ac3e4de843c8c2021-12-02T12:32:44ZCapacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea10.1038/s41598-017-01533-62045-2322https://doaj.org/article/bde86bd615d54773ab2ac3e4de843c8c2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01533-6https://doaj.org/toc/2045-2322Abstract The iron binding capacities (IBC) of fulvic acid (FA) and humic acid (HA) were determined in the salinity range from 5 to 40. The results indicated that IBC decreased while salinity increased. In addition, dissolved iron (dFe), FA and HA were also determined along the Yangtze River estuary’s increasing salinity gradient from 0.14 to 33. The loss rates of dFe, FA and HA in the Yangtze River estuary were up to 96%, 74%, and 67%, respectively. The decreases in dFe, FA and HA, as well as the change in IBC of humic substances (HS) along the salinity gradient in the Yangtze River estuary were all well described by a first-order exponential attenuation model: y(dFe/FA/HA, S) = a0 × exp(kS) + y0. These results indicate that flocculation of FA and HA along the salinity gradient resulted in removal of dFe. Furthermore, the exponential attenuation model described in this paper can be applied in the major estuaries of the world where most of the removal of dFe and HS occurs where freshwater and seawater mix.Rujun YangHan SuShenglu QuXuchen WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rujun Yang Han Su Shenglu Qu Xuchen Wang Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea
description	Abstract The iron binding capacities (IBC) of fulvic acid (FA) and humic acid (HA) were determined in the salinity range from 5 to 40. The results indicated that IBC decreased while salinity increased. In addition, dissolved iron (dFe), FA and HA were also determined along the Yangtze River estuary’s increasing salinity gradient from 0.14 to 33. The loss rates of dFe, FA and HA in the Yangtze River estuary were up to 96%, 74%, and 67%, respectively. The decreases in dFe, FA and HA, as well as the change in IBC of humic substances (HS) along the salinity gradient in the Yangtze River estuary were all well described by a first-order exponential attenuation model: y(dFe/FA/HA, S) = a0 × exp(kS) + y0. These results indicate that flocculation of FA and HA along the salinity gradient resulted in removal of dFe. Furthermore, the exponential attenuation model described in this paper can be applied in the major estuaries of the world where most of the removal of dFe and HS occurs where freshwater and seawater mix.
format	article
author	Rujun Yang Han Su Shenglu Qu Xuchen Wang
author_facet	Rujun Yang Han Su Shenglu Qu Xuchen Wang
author_sort	Rujun Yang
title	Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea
title_short	Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea
title_full	Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea
title_fullStr	Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea
title_full_unstemmed	Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea
title_sort	capacity of humic substances to complex with iron at different salinities in the yangtze river estuary and east china sea
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/bde86bd615d54773ab2ac3e4de843c8c
work_keys_str_mv	AT rujunyang capacityofhumicsubstancestocomplexwithironatdifferentsalinitiesintheyangtzeriverestuaryandeastchinasea AT hansu capacityofhumicsubstancestocomplexwithironatdifferentsalinitiesintheyangtzeriverestuaryandeastchinasea AT shengluqu capacityofhumicsubstancestocomplexwithironatdifferentsalinitiesintheyangtzeriverestuaryandeastchinasea AT xuchenwang capacityofhumicsubstancestocomplexwithironatdifferentsalinitiesintheyangtzeriverestuaryandeastchinasea
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Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea

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