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Mobility of chromium in sediments dominated by macrophytes and cyanobacteria in different zones of Lake Taihu.

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Title: Mobility of chromium in sediments dominated by macrophytes and cyanobacteria in different zones of Lake Taihu.
Authors: Fan, Xianfang1 (AUTHOR), Ding, Shiming1 (AUTHOR) smding@niglas.ac.cn, Chen, Musong1 (AUTHOR), Gao, Shuaishuai1 (AUTHOR), Fu, Zhen1 (AUTHOR), Gong, Mengdan1 (AUTHOR), Wang, Yan1 (AUTHOR), Zhang, Chaosheng1 (AUTHOR)
Source: Science of the Total Environment. May2019, Vol. 666, p994-1002. 9p.
Abstract: Abstract To study the mechanisms of chromium (Cr) mobilization in sediments of lakes with different ecotypes, seasonal sampling was performed in the macrophyte-dominated East Taihu (MDET) and cyanobacteria-dominated Meiliang Bay (CDMB) in Lake Taihu. Concentrations of labile Cr(VI) and dissolved Cr were assessed using diffusive gradients in thin films (DGT) and high-resolution dialysis passive sampling devices, respectively. Results indicated that in pore water the dissolved Cr concentrations and in sediments total Cr and Cr fractions concentrations (dissolved, exchangeable and carbonate fraction (F1), Fe-Mn oxide fraction (F2), organic/sulfide fraction (F3)) were lower in MDET than in CDMB. However, the highly toxic DGT-labile Cr(VI) concentrations were higher in MDET sediments than in CDMB sediments. In the two lake zones, the seasonal variations in concentrations of dissolved Cr and DGT-labile Cr(VI) were significant, while total Cr and Cr fractions showed negligible changes (except F1 fraction). In summer, the high mobility of dissolved Cr (MDET: 103.42 ± 10.82 μg/L; CDMB: 108.99 ± 4.24 μg/L) were mainly caused by dissolved organic matter complexing with Cr(III). In winter the high mobility of dissolved Cr (MDET: 100.27 ± 22.04 μg/L; CDMB: 102.01 ± 8.81 μg/L) and DGT-labile Cr(VI) (MDET: 28.26 ± 3.73 μg/L; CDLZ: 25.82 ± 2.26 μg/L) were primarily caused by the oxidization of Cr (III) by Mn(III/IV) oxides. This study establishes the mechanisms for seasonal variation of Cr mobilization in different lake ecological zones, highlighting the urgent need for remediation of Cr pollution, especially in macrophyte-dominated lake zones. Graphical abstract Unlabelled Image Highlights • The dissolved Cr level was higher in Meiliang Bay than in East Taihu. • The DGT-labile Cr(VI) level was higher in East Taihu than in Meiliang Bay. • The high Cr mobility in summer was caused by DOC complexation with Cr(III). • The Cr(III) oxidization by Mn(III/IV) caused the high Cr mobility in winter. [ABSTRACT FROM AUTHOR]
Copyright of Science of the Total Environment is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mobility of chromium in sediments dominated by macrophytes and cyanobacteria in different zones of Lake Taihu.
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  Data: <searchLink fieldCode="AR" term="%22Fan%2C+Xianfang%22">Fan, Xianfang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ding%2C+Shiming%22">Ding, Shiming</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> smding@niglas.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Chen%2C+Musong%22">Chen, Musong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gao%2C+Shuaishuai%22">Gao, Shuaishuai</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fu%2C+Zhen%22">Fu, Zhen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gong%2C+Mengdan%22">Gong, Mengdan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Yan%22">Wang, Yan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Chaosheng%22">Zhang, Chaosheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Science+of+the+Total+Environment%22">Science of the Total Environment</searchLink>. May2019, Vol. 666, p994-1002. 9p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract To study the mechanisms of chromium (Cr) mobilization in sediments of lakes with different ecotypes, seasonal sampling was performed in the macrophyte-dominated East Taihu (MDET) and cyanobacteria-dominated Meiliang Bay (CDMB) in Lake Taihu. Concentrations of labile Cr(VI) and dissolved Cr were assessed using diffusive gradients in thin films (DGT) and high-resolution dialysis passive sampling devices, respectively. Results indicated that in pore water the dissolved Cr concentrations and in sediments total Cr and Cr fractions concentrations (dissolved, exchangeable and carbonate fraction (F1), Fe-Mn oxide fraction (F2), organic/sulfide fraction (F3)) were lower in MDET than in CDMB. However, the highly toxic DGT-labile Cr(VI) concentrations were higher in MDET sediments than in CDMB sediments. In the two lake zones, the seasonal variations in concentrations of dissolved Cr and DGT-labile Cr(VI) were significant, while total Cr and Cr fractions showed negligible changes (except F1 fraction). In summer, the high mobility of dissolved Cr (MDET: 103.42 ± 10.82 μg/L; CDMB: 108.99 ± 4.24 μg/L) were mainly caused by dissolved organic matter complexing with Cr(III). In winter the high mobility of dissolved Cr (MDET: 100.27 ± 22.04 μg/L; CDMB: 102.01 ± 8.81 μg/L) and DGT-labile Cr(VI) (MDET: 28.26 ± 3.73 μg/L; CDLZ: 25.82 ± 2.26 μg/L) were primarily caused by the oxidization of Cr (III) by Mn(III/IV) oxides. This study establishes the mechanisms for seasonal variation of Cr mobilization in different lake ecological zones, highlighting the urgent need for remediation of Cr pollution, especially in macrophyte-dominated lake zones. Graphical abstract Unlabelled Image Highlights • The dissolved Cr level was higher in Meiliang Bay than in East Taihu. • The DGT-labile Cr(VI) level was higher in East Taihu than in Meiliang Bay. • The high Cr mobility in summer was caused by DOC complexation with Cr(III). • The Cr(III) oxidization by Mn(III/IV) caused the high Cr mobility in winter. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Science of the Total Environment is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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