Towards a novel method for iron species determination in Antarctic sea ice

Sea-ice borne iron has been found to be an important factor controlling Southern Ocean phytoplankton growth [1]. Knowing the amount and chemical speciation of its labile fraction in sea ice would advance our understanding of the involved processes. Unfortunately, it is rather difficult to perform th...

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Main Authors: Budasheva, Hanna, Bratkič, Arne, Korte, Dorota, Franko, Mladen
Format: Other/Unknown Material
Language:English
Published: 2021
Subjects:
Online Access:http://repozitorij.ung.si/IzpisGradiva.php?id=7011
https://plus.si.cobiss.net/opac7/bib/87060483?lang=sl
id ftunivnovagorica:oai:repozitorij.ung.si:IzpisGradiva.php-id-7011
record_format openpolar
spelling ftunivnovagorica:oai:repozitorij.ung.si:IzpisGradiva.php-id-7011 2023-05-15T14:00:46+02:00 Towards a novel method for iron species determination in Antarctic sea ice Budasheva, Hanna Bratkič, Arne Korte, Dorota Franko, Mladen 2021-11-30 http://repozitorij.ung.si/IzpisGradiva.php?id=7011 https://plus.si.cobiss.net/opac7/bib/87060483?lang=sl eng eng info:eu-repo/semantics/altIdentifier/urn/URN:SI:UNG:REP:QUJPZN9N http://repozitorij.ung.si/IzpisGradiva.php?id=7011 https://plus.si.cobiss.net/opac7/bib/87060483?lang=sl info:eu-repo/semantics/closedAccess Zbornik povzetkov ISBN: 978-961-93849-9-2 beam deflection spectrometry diffusive gradients thin films iron species photothermal techniques Antarctic sea ice info:eu-repo/classification/udc/54 info:eu-repo/semantics/other info:eu-repo/semantics/publishedVersion 2021 ftunivnovagorica 2022-12-28T10:18:38Z Sea-ice borne iron has been found to be an important factor controlling Southern Ocean phytoplankton growth [1]. Knowing the amount and chemical speciation of its labile fraction in sea ice would advance our understanding of the involved processes. Unfortunately, it is rather difficult to perform their measurement because of limited access to the Antarctic. Thus there is a strong need for the development of a quick, simple and reliable technique for determination of iron and its speciation in sea-ice that ensures also low enough limits of detection. Recently, diffusive gradients in thin films (DGT) have been widely used as passive samplers for collecting time-averaged data on the concentrations of transition metals in different media [2]. DGTs are further coupled to an analytical technique that in case of detecting metals in passive sampler films primarily requires their extraction [3], which may potentially lead to changes of the metal specification. In the present study, the beam deflection spectrometry (BDS) is coupled to DGT and used to determine the average concentration of iron in the sea ice samples collected at the Davis Station in the Antarctic. Such a combined technique has been already successfully applied for detecting labile iron species in freshwater sediments [4]. The obtained BDS data were validated by thermal lens spectrometry (TLS) and UV-Vis spectrophotometry (SPEC). The distribution of iron species over a given ice surface area using the DGT-BDS technique revealed total iron concentrations in the range of 0.6 – 5.3 μgL-1, whereas the Fe2+ content was found to be in the range of 0.1 – 1.5 μgL-1. The range taking into account all of the measurement points (5×4), the precision of a single measured point is 0.2 μgL-1. The calculated 24 h-average concentration of total Fe labile species in the ice by using BDS is 2.3 ± 0.5 μgL-1, which coincides with data obtained by SPEC (2.5 ± 0.4 μgL-1) and TLS (2.39 ± 0.02 μgL-1). Our results indicate that it is possible to develop a robust, ... Other/Unknown Material Antarc* Antarctic Sea ice Southern Ocean Repozitorij Univerze v Novi Gorici Antarctic Davis Station ENVELOPE(77.968,77.968,-68.576,-68.576) Davis-Station ENVELOPE(77.968,77.968,-68.576,-68.576) Southern Ocean The Antarctic
institution Open Polar
collection Repozitorij Univerze v Novi Gorici
op_collection_id ftunivnovagorica
language English
topic beam deflection spectrometry
diffusive gradients
thin films
iron species
photothermal techniques
Antarctic sea ice
info:eu-repo/classification/udc/54
spellingShingle beam deflection spectrometry
diffusive gradients
thin films
iron species
photothermal techniques
Antarctic sea ice
info:eu-repo/classification/udc/54
Budasheva, Hanna
Bratkič, Arne
Korte, Dorota
Franko, Mladen
Towards a novel method for iron species determination in Antarctic sea ice
topic_facet beam deflection spectrometry
diffusive gradients
thin films
iron species
photothermal techniques
Antarctic sea ice
info:eu-repo/classification/udc/54
description Sea-ice borne iron has been found to be an important factor controlling Southern Ocean phytoplankton growth [1]. Knowing the amount and chemical speciation of its labile fraction in sea ice would advance our understanding of the involved processes. Unfortunately, it is rather difficult to perform their measurement because of limited access to the Antarctic. Thus there is a strong need for the development of a quick, simple and reliable technique for determination of iron and its speciation in sea-ice that ensures also low enough limits of detection. Recently, diffusive gradients in thin films (DGT) have been widely used as passive samplers for collecting time-averaged data on the concentrations of transition metals in different media [2]. DGTs are further coupled to an analytical technique that in case of detecting metals in passive sampler films primarily requires their extraction [3], which may potentially lead to changes of the metal specification. In the present study, the beam deflection spectrometry (BDS) is coupled to DGT and used to determine the average concentration of iron in the sea ice samples collected at the Davis Station in the Antarctic. Such a combined technique has been already successfully applied for detecting labile iron species in freshwater sediments [4]. The obtained BDS data were validated by thermal lens spectrometry (TLS) and UV-Vis spectrophotometry (SPEC). The distribution of iron species over a given ice surface area using the DGT-BDS technique revealed total iron concentrations in the range of 0.6 – 5.3 μgL-1, whereas the Fe2+ content was found to be in the range of 0.1 – 1.5 μgL-1. The range taking into account all of the measurement points (5×4), the precision of a single measured point is 0.2 μgL-1. The calculated 24 h-average concentration of total Fe labile species in the ice by using BDS is 2.3 ± 0.5 μgL-1, which coincides with data obtained by SPEC (2.5 ± 0.4 μgL-1) and TLS (2.39 ± 0.02 μgL-1). Our results indicate that it is possible to develop a robust, ...
format Other/Unknown Material
author Budasheva, Hanna
Bratkič, Arne
Korte, Dorota
Franko, Mladen
author_facet Budasheva, Hanna
Bratkič, Arne
Korte, Dorota
Franko, Mladen
author_sort Budasheva, Hanna
title Towards a novel method for iron species determination in Antarctic sea ice
title_short Towards a novel method for iron species determination in Antarctic sea ice
title_full Towards a novel method for iron species determination in Antarctic sea ice
title_fullStr Towards a novel method for iron species determination in Antarctic sea ice
title_full_unstemmed Towards a novel method for iron species determination in Antarctic sea ice
title_sort towards a novel method for iron species determination in antarctic sea ice
publishDate 2021
url http://repozitorij.ung.si/IzpisGradiva.php?id=7011
https://plus.si.cobiss.net/opac7/bib/87060483?lang=sl
long_lat ENVELOPE(77.968,77.968,-68.576,-68.576)
ENVELOPE(77.968,77.968,-68.576,-68.576)
geographic Antarctic
Davis Station
Davis-Station
Southern Ocean
The Antarctic
geographic_facet Antarctic
Davis Station
Davis-Station
Southern Ocean
The Antarctic
genre Antarc*
Antarctic
Sea ice
Southern Ocean
genre_facet Antarc*
Antarctic
Sea ice
Southern Ocean
op_source Zbornik povzetkov
ISBN: 978-961-93849-9-2
op_relation info:eu-repo/semantics/altIdentifier/urn/URN:SI:UNG:REP:QUJPZN9N
http://repozitorij.ung.si/IzpisGradiva.php?id=7011
https://plus.si.cobiss.net/opac7/bib/87060483?lang=sl
op_rights info:eu-repo/semantics/closedAccess
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