In situ measurement of redox sensitive solutes at high spatial resolution in a riverbed using Diffusive Equilibrium in Thin Films (DET)

Sami Ullah; Hao Zhang; A. Louise Heathwaite; Andrew Binley; Katrina Lansdown; Kate Heppell; Mark Trimmer

doi:10.1016/j.ecoleng.2012.08.003

In situ measurement of redox sensitive solutes at high spatial resolution in a riverbed using Diffusive Equilibrium in Thin Films (DET)

Sami Ullah^*, Hao Zhang, A. Louise Heathwaite, Andrew Binley, Katrina Lansdown, Kate Heppell, Mark Trimmer

^*Corresponding author for this work

Geography

Research output: Contribution to journal › Article › peer-review

Abstract

Here we evaluate a new field methodology for the deployment of Diffusive Equilibrium in Thin Films (DET, protected in stainless steel holders) in coarse riverbed sediments based on that originally developed for fine-grained sediments and soils. Concentration gradients of NO ₃ ^-, NH ₄ ⁺ and dissolved Mn were measured at cm resolution. We observed fine scale changes in NO ₃ ^-, NH ₄ ⁺, and Mn concentrations in the river bed (0-30cm) that were only evident at high resolution and compared them to profiles of NO ₃ ^- and NH ₄ ⁺ obtained with low resolution multilevel piezometers. The range in concentrations of NO ₃ ^- and NH ₄ ⁺ measured through DET was larger than those measured at coarse resolution through pore water sampling from multilevel piezometer in the riverbed over the 30cm depth. According to the results, high resolution profiles of redox sensitive chemical species in riverbeds could help in identifying and resolving hotspots of biogeochemical activity. Measurements of NH ₄ ⁺ using DET were higher than measurements in pore water collected from the multilevel samplers. Further studies are needed to establish whether there is a systematic bias associated with either procedure for the measurement of NH ₄ ⁺.

Original language	English
Pages (from-to)	18-26
Number of pages	9
Journal	Ecological Engineering
Volume	49
DOIs	https://doi.org/10.1016/j.ecoleng.2012.08.003
Publication status	Published - Dec 2012

Bibliographical note

Funding Information:
We thank Neil Mullinger, Paddy Keenan, Hao Cheng, Mohammad Shafaei, and Chun Lin at Lancaster Environment Centre and Charlott Sauzeau at Ecole Nationale Supérieure de Chimie de Rennes, France for help with field sampling and laboratory analyses. The research was funded by the Natural Environment Research Council Grant NE/F006063/1 .

Keywords

DET
Freshwater
Groundwater-fed rivers
Hyporheic
In situ measurement
N cycling
Passive samplers
Redox
Riverbed

ASJC Scopus subject areas

Environmental Engineering
Nature and Landscape Conservation
Management, Monitoring, Policy and Law

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ecoleng.2012.08.003

Cite this

@article{6fb16c34ac9e4cc795c5f1fc94e02bc9,

title = "In situ measurement of redox sensitive solutes at high spatial resolution in a riverbed using Diffusive Equilibrium in Thin Films (DET)",

abstract = "Here we evaluate a new field methodology for the deployment of Diffusive Equilibrium in Thin Films (DET, protected in stainless steel holders) in coarse riverbed sediments based on that originally developed for fine-grained sediments and soils. Concentration gradients of NO 3 -, NH 4 + and dissolved Mn were measured at cm resolution. We observed fine scale changes in NO 3 -, NH 4 +, and Mn concentrations in the river bed (0-30cm) that were only evident at high resolution and compared them to profiles of NO 3 - and NH 4 + obtained with low resolution multilevel piezometers. The range in concentrations of NO 3 - and NH 4 + measured through DET was larger than those measured at coarse resolution through pore water sampling from multilevel piezometer in the riverbed over the 30cm depth. According to the results, high resolution profiles of redox sensitive chemical species in riverbeds could help in identifying and resolving hotspots of biogeochemical activity. Measurements of NH 4 + using DET were higher than measurements in pore water collected from the multilevel samplers. Further studies are needed to establish whether there is a systematic bias associated with either procedure for the measurement of NH 4 +.",

keywords = "DET, Freshwater, Groundwater-fed rivers, Hyporheic, In situ measurement, N cycling, Passive samplers, Redox, Riverbed",

author = "Sami Ullah and Hao Zhang and Heathwaite, {A. Louise} and Andrew Binley and Katrina Lansdown and Kate Heppell and Mark Trimmer",

note = "Funding Information: We thank Neil Mullinger, Paddy Keenan, Hao Cheng, Mohammad Shafaei, and Chun Lin at Lancaster Environment Centre and Charlott Sauzeau at Ecole Nationale Sup{\'e}rieure de Chimie de Rennes, France for help with field sampling and laboratory analyses. The research was funded by the Natural Environment Research Council Grant NE/F006063/1 .",

year = "2012",

month = dec,

doi = "10.1016/j.ecoleng.2012.08.003",

language = "English",

volume = "49",

pages = "18--26",

journal = "Ecological Engineering",

issn = "0925-8574",

publisher = "Elsevier",

}

TY - JOUR

T1 - In situ measurement of redox sensitive solutes at high spatial resolution in a riverbed using Diffusive Equilibrium in Thin Films (DET)

AU - Ullah, Sami

AU - Zhang, Hao

AU - Heathwaite, A. Louise

AU - Binley, Andrew

AU - Lansdown, Katrina

AU - Heppell, Kate

AU - Trimmer, Mark

N1 - Funding Information: We thank Neil Mullinger, Paddy Keenan, Hao Cheng, Mohammad Shafaei, and Chun Lin at Lancaster Environment Centre and Charlott Sauzeau at Ecole Nationale Supérieure de Chimie de Rennes, France for help with field sampling and laboratory analyses. The research was funded by the Natural Environment Research Council Grant NE/F006063/1 .

PY - 2012/12

Y1 - 2012/12

N2 - Here we evaluate a new field methodology for the deployment of Diffusive Equilibrium in Thin Films (DET, protected in stainless steel holders) in coarse riverbed sediments based on that originally developed for fine-grained sediments and soils. Concentration gradients of NO 3 -, NH 4 + and dissolved Mn were measured at cm resolution. We observed fine scale changes in NO 3 -, NH 4 +, and Mn concentrations in the river bed (0-30cm) that were only evident at high resolution and compared them to profiles of NO 3 - and NH 4 + obtained with low resolution multilevel piezometers. The range in concentrations of NO 3 - and NH 4 + measured through DET was larger than those measured at coarse resolution through pore water sampling from multilevel piezometer in the riverbed over the 30cm depth. According to the results, high resolution profiles of redox sensitive chemical species in riverbeds could help in identifying and resolving hotspots of biogeochemical activity. Measurements of NH 4 + using DET were higher than measurements in pore water collected from the multilevel samplers. Further studies are needed to establish whether there is a systematic bias associated with either procedure for the measurement of NH 4 +.

AB - Here we evaluate a new field methodology for the deployment of Diffusive Equilibrium in Thin Films (DET, protected in stainless steel holders) in coarse riverbed sediments based on that originally developed for fine-grained sediments and soils. Concentration gradients of NO 3 -, NH 4 + and dissolved Mn were measured at cm resolution. We observed fine scale changes in NO 3 -, NH 4 +, and Mn concentrations in the river bed (0-30cm) that were only evident at high resolution and compared them to profiles of NO 3 - and NH 4 + obtained with low resolution multilevel piezometers. The range in concentrations of NO 3 - and NH 4 + measured through DET was larger than those measured at coarse resolution through pore water sampling from multilevel piezometer in the riverbed over the 30cm depth. According to the results, high resolution profiles of redox sensitive chemical species in riverbeds could help in identifying and resolving hotspots of biogeochemical activity. Measurements of NH 4 + using DET were higher than measurements in pore water collected from the multilevel samplers. Further studies are needed to establish whether there is a systematic bias associated with either procedure for the measurement of NH 4 +.

KW - DET

KW - Freshwater

KW - Groundwater-fed rivers

KW - Hyporheic

KW - In situ measurement

KW - N cycling

KW - Passive samplers

KW - Redox

KW - Riverbed

UR - http://www.scopus.com/inward/record.url?scp=84866642244&partnerID=8YFLogxK

U2 - 10.1016/j.ecoleng.2012.08.003

DO - 10.1016/j.ecoleng.2012.08.003

M3 - Article

AN - SCOPUS:84866642244

SN - 0925-8574

VL - 49

SP - 18

EP - 26

JO - Ecological Engineering

JF - Ecological Engineering

ER -

In situ measurement of redox sensitive solutes at high spatial resolution in a riverbed using Diffusive Equilibrium in Thin Films (DET)

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

Fingerprint

Cite this