Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed

The hyporheic zone regulates physicochemical processes in surface-groundwater systems and can be an important source of heavy metals in fluvial systems. This study assesses the pore water concentrations and diffusive fluxes of heavy metals with respect to the vertical water exchange flux (VWEF) and...

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Autores principales: Liu, Qi, Song, Jinxi, Zhang, Guotao, Wang, Weize, Guo, Weiqiang, Tang, Bin, Kong, Feihe, Huo, Aidi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5615557/
https://www.ncbi.nlm.nih.gov/pubmed/28878185
http://dx.doi.org/10.3390/ijerph14091020
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author Liu, Qi
Song, Jinxi
Zhang, Guotao
Wang, Weize
Guo, Weiqiang
Tang, Bin
Kong, Feihe
Huo, Aidi
author_facet Liu, Qi
Song, Jinxi
Zhang, Guotao
Wang, Weize
Guo, Weiqiang
Tang, Bin
Kong, Feihe
Huo, Aidi
author_sort Liu, Qi
collection PubMed
description The hyporheic zone regulates physicochemical processes in surface-groundwater systems and can be an important source of heavy metals in fluvial systems. This study assesses the pore water concentrations and diffusive fluxes of heavy metals with respect to the vertical water exchange flux (VWEF) and sediment grain size. Water and sediment samples were collected on August 2016 from upstream Site 1 and downstream Site 2 along the Juehe River in Shaanxi Province, China. Streambed vertical hydraulic conductivity ([Formula: see text]) and the VWEF were estimated via the standpipe permeameter test method and Darcy’s law. The heavy metal concentrations in the pore water were measured and the diffusive fluxes were calculated using Fick’s first law. The VWEF patterns were dominated by upward flow, and Site 1 featured higher values of [Formula: see text] and VWEF. Higher Cu and Zn concentrations occurred near the channel centre with coarse sand and gravel and greater upward VWEFs because coarser sediment and greater upward VWEFs cause stronger metal desorption capacity. Additionally, Cu and Zn at the two sites generally diffused from pore water to surface water, potentially due to the upward VWEF. The VWEF and sediment grain size are likely crucial factors influencing the heavy metal concentrations and diffusive fluxes.
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spelling pubmed-56155572017-09-30 Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed Liu, Qi Song, Jinxi Zhang, Guotao Wang, Weize Guo, Weiqiang Tang, Bin Kong, Feihe Huo, Aidi Int J Environ Res Public Health Article The hyporheic zone regulates physicochemical processes in surface-groundwater systems and can be an important source of heavy metals in fluvial systems. This study assesses the pore water concentrations and diffusive fluxes of heavy metals with respect to the vertical water exchange flux (VWEF) and sediment grain size. Water and sediment samples were collected on August 2016 from upstream Site 1 and downstream Site 2 along the Juehe River in Shaanxi Province, China. Streambed vertical hydraulic conductivity ([Formula: see text]) and the VWEF were estimated via the standpipe permeameter test method and Darcy’s law. The heavy metal concentrations in the pore water were measured and the diffusive fluxes were calculated using Fick’s first law. The VWEF patterns were dominated by upward flow, and Site 1 featured higher values of [Formula: see text] and VWEF. Higher Cu and Zn concentrations occurred near the channel centre with coarse sand and gravel and greater upward VWEFs because coarser sediment and greater upward VWEFs cause stronger metal desorption capacity. Additionally, Cu and Zn at the two sites generally diffused from pore water to surface water, potentially due to the upward VWEF. The VWEF and sediment grain size are likely crucial factors influencing the heavy metal concentrations and diffusive fluxes. MDPI 2017-09-06 2017-09 /pmc/articles/PMC5615557/ /pubmed/28878185 http://dx.doi.org/10.3390/ijerph14091020 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liu, Qi
Song, Jinxi
Zhang, Guotao
Wang, Weize
Guo, Weiqiang
Tang, Bin
Kong, Feihe
Huo, Aidi
Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed
title Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed
title_full Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed
title_fullStr Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed
title_full_unstemmed Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed
title_short Effects of Hyporheic Water Fluxes and Sediment Grain Size on the Concentration and Diffusive Flux of Heavy Metals in the Streambed
title_sort effects of hyporheic water fluxes and sediment grain size on the concentration and diffusive flux of heavy metals in the streambed
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5615557/
https://www.ncbi.nlm.nih.gov/pubmed/28878185
http://dx.doi.org/10.3390/ijerph14091020
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