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Development and application of a microfluidic in-situ analyzer for dissolved Fe and Mn in natural waters

Development and application of a microfluidic in-situ analyzer for dissolved Fe and Mn in natural waters
Development and application of a microfluidic in-situ analyzer for dissolved Fe and Mn in natural waters
The redox sensitive trace metals iron and manganese are two important elements that help shape the biogeochemistry of aquatic systems and thus their measurement is important. Current laboratory methods are expensive, time consuming and cannot provide the spatial and temporal resolution needed to characterize these elements in natural waters. Here we describe the first autonomous analyzer capable of providing vertical profiles as well as routine in-situ determinations of dissolved Fe(II) and Mn in aquatic environments. The spectrophotometric sensor uses microfluidic methods (Lab-on-a-chip technology) and mixes reagents and samples using a novel in-cell diffusion process. Fe(II) and Mn can be measured with a frequency of up to 12 and 6 samples per hour respectively with limits of detection of 27 nM for Fe(II), 2.1% precision (n=20), and 28 nM for Mn, 2.4% precision (n=19). The device combines relatively low cost, low power usage, low reagent consumption, portability, and tolerance to pressures up to at least 170 bars, with high precision and accuracy. We present data from a successful demonstration of the sensor during a cruise to the Gotland and Landsort Deep Basins of the Baltic Sea.
In-situ sensor, Trace metal analysis, Lab-on-a-chip, Iron, Manganese
0039-9140
15-22
Milani, Ambra
839ef5af-ea55-4f7c-a5d6-5dfa4c5b62aa
Statham, Peter J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Mowlem, Matt C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Milani, Ambra
839ef5af-ea55-4f7c-a5d6-5dfa4c5b62aa
Statham, Peter J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Mowlem, Matt C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8

Milani, Ambra, Statham, Peter J., Mowlem, Matt C. and Connelly, Douglas P. (2015) Development and application of a microfluidic in-situ analyzer for dissolved Fe and Mn in natural waters. Talanta, 136, 15-22. (doi:10.1016/j.talanta.2014.12.045).

Record type: Article

Abstract

The redox sensitive trace metals iron and manganese are two important elements that help shape the biogeochemistry of aquatic systems and thus their measurement is important. Current laboratory methods are expensive, time consuming and cannot provide the spatial and temporal resolution needed to characterize these elements in natural waters. Here we describe the first autonomous analyzer capable of providing vertical profiles as well as routine in-situ determinations of dissolved Fe(II) and Mn in aquatic environments. The spectrophotometric sensor uses microfluidic methods (Lab-on-a-chip technology) and mixes reagents and samples using a novel in-cell diffusion process. Fe(II) and Mn can be measured with a frequency of up to 12 and 6 samples per hour respectively with limits of detection of 27 nM for Fe(II), 2.1% precision (n=20), and 28 nM for Mn, 2.4% precision (n=19). The device combines relatively low cost, low power usage, low reagent consumption, portability, and tolerance to pressures up to at least 170 bars, with high precision and accuracy. We present data from a successful demonstration of the sensor during a cruise to the Gotland and Landsort Deep Basins of the Baltic Sea.

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More information

Published date: 1 May 2015
Keywords: In-situ sensor, Trace metal analysis, Lab-on-a-chip, Iron, Manganese
Organisations: Ocean and Earth Science, Marine Geoscience, Ocean Technology and Engineering

Identifiers

Local EPrints ID: 374973
URI: http://eprints.soton.ac.uk/id/eprint/374973
ISSN: 0039-9140
PURE UUID: 0fb04262-3dea-4513-b7b4-45c9e1efebdc

Catalogue record

Date deposited: 06 Mar 2015 15:12
Last modified: 08 Jan 2022 03:16

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Contributors

Author: Ambra Milani
Author: Matt C. Mowlem
Author: Douglas P. Connelly

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