An Optical Dye Method for Continuous Determination of Acidity in Ice Cores
The pH of polar ice is important for the stability and mobility of impurities in ice cores and can be strongly influenced by volcanic eruptions or anthropogenic emissions. We present a simple optical method for continuous determination of acidity in ice cores based on spectroscopically determined co...
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ftawi:oai:epic.awi.de:42220 2024-09-15T17:41:09+00:00 An Optical Dye Method for Continuous Determination of Acidity in Ice Cores Kjær, Helle Astrid Vallelonga, Paul Svensson, Anders Elleskov L. Kristensen, Magnus Tibuleac, Catalin Winstrup, Mai Kipfstuhl, Sepp 2016 https://epic.awi.de/id/eprint/42220/ https://doi.org/10.1021/acs.est.6b00026 https://hdl.handle.net/10013/epic.48945 unknown ACS Publications Kjær, H. A. , Vallelonga, P. , Svensson, A. , Elleskov L. Kristensen, M. , Tibuleac, C. , Winstrup, M. and Kipfstuhl, S. (2016) An Optical Dye Method for Continuous Determination of Acidity in Ice Cores , Environmental Science & Technology, 50 (19), pp. 10485-10493 . doi:10.1021/acs.est.6b00026 <https://doi.org/10.1021/acs.est.6b00026> , hdl:10013/epic.48945 EPIC3Environmental Science & Technology, ACS Publications, 50(19), pp. 10485-10493, ISSN: 0013-936X Article isiRev 2016 ftawi https://doi.org/10.1021/acs.est.6b00026 2024-06-24T04:15:36Z The pH of polar ice is important for the stability and mobility of impurities in ice cores and can be strongly influenced by volcanic eruptions or anthropogenic emissions. We present a simple optical method for continuous determination of acidity in ice cores based on spectroscopically determined color changes of two common pH-indicator dyes, bromophenol blue, and chlorophenol red. The sealed-system method described here is not equilibrated with CO2, making it simpler than existing methods for pH determination in ice cores and offering a 10–90% peak response time of 45 s and a combined uncertainty of 9%. The method is applied to Holocene ice core sections from Greenland and Antarctica and compared to standard techniques such as electrical conductivity measurement (ECM) conducted on the solid ice, and electrolytic meltwater conductivity, EMWC. Acidity measured in the Greenland NGRIP ice core shows good agreement with acidity calculated from ion chromatography. Conductivity and dye-based acidity Hdye+ are found to be highly correlated in the Greenland NEGIS firn core (75.38° N, 35.56° W), with all signals greater than 3σ variability coinciding with either volcanic eruptions or possible wild fire activity. In contrast, the Antarctic Roosevelt Island ice core (79.36° S, 161.71° W) features an anticorrelation between conductivity and Hdye+, likely due to strong influence of marine salts. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland ice core NGRIP Roosevelt Island Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Environmental Science & Technology 50 19 10485 10493 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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unknown |
description |
The pH of polar ice is important for the stability and mobility of impurities in ice cores and can be strongly influenced by volcanic eruptions or anthropogenic emissions. We present a simple optical method for continuous determination of acidity in ice cores based on spectroscopically determined color changes of two common pH-indicator dyes, bromophenol blue, and chlorophenol red. The sealed-system method described here is not equilibrated with CO2, making it simpler than existing methods for pH determination in ice cores and offering a 10–90% peak response time of 45 s and a combined uncertainty of 9%. The method is applied to Holocene ice core sections from Greenland and Antarctica and compared to standard techniques such as electrical conductivity measurement (ECM) conducted on the solid ice, and electrolytic meltwater conductivity, EMWC. Acidity measured in the Greenland NGRIP ice core shows good agreement with acidity calculated from ion chromatography. Conductivity and dye-based acidity Hdye+ are found to be highly correlated in the Greenland NEGIS firn core (75.38° N, 35.56° W), with all signals greater than 3σ variability coinciding with either volcanic eruptions or possible wild fire activity. In contrast, the Antarctic Roosevelt Island ice core (79.36° S, 161.71° W) features an anticorrelation between conductivity and Hdye+, likely due to strong influence of marine salts. |
format |
Article in Journal/Newspaper |
author |
Kjær, Helle Astrid Vallelonga, Paul Svensson, Anders Elleskov L. Kristensen, Magnus Tibuleac, Catalin Winstrup, Mai Kipfstuhl, Sepp |
spellingShingle |
Kjær, Helle Astrid Vallelonga, Paul Svensson, Anders Elleskov L. Kristensen, Magnus Tibuleac, Catalin Winstrup, Mai Kipfstuhl, Sepp An Optical Dye Method for Continuous Determination of Acidity in Ice Cores |
author_facet |
Kjær, Helle Astrid Vallelonga, Paul Svensson, Anders Elleskov L. Kristensen, Magnus Tibuleac, Catalin Winstrup, Mai Kipfstuhl, Sepp |
author_sort |
Kjær, Helle Astrid |
title |
An Optical Dye Method for Continuous Determination of Acidity in Ice Cores |
title_short |
An Optical Dye Method for Continuous Determination of Acidity in Ice Cores |
title_full |
An Optical Dye Method for Continuous Determination of Acidity in Ice Cores |
title_fullStr |
An Optical Dye Method for Continuous Determination of Acidity in Ice Cores |
title_full_unstemmed |
An Optical Dye Method for Continuous Determination of Acidity in Ice Cores |
title_sort |
optical dye method for continuous determination of acidity in ice cores |
publisher |
ACS Publications |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/42220/ https://doi.org/10.1021/acs.est.6b00026 https://hdl.handle.net/10013/epic.48945 |
genre |
Antarc* Antarctic Antarctica Greenland ice core NGRIP Roosevelt Island |
genre_facet |
Antarc* Antarctic Antarctica Greenland ice core NGRIP Roosevelt Island |
op_source |
EPIC3Environmental Science & Technology, ACS Publications, 50(19), pp. 10485-10493, ISSN: 0013-936X |
op_relation |
Kjær, H. A. , Vallelonga, P. , Svensson, A. , Elleskov L. Kristensen, M. , Tibuleac, C. , Winstrup, M. and Kipfstuhl, S. (2016) An Optical Dye Method for Continuous Determination of Acidity in Ice Cores , Environmental Science & Technology, 50 (19), pp. 10485-10493 . doi:10.1021/acs.est.6b00026 <https://doi.org/10.1021/acs.est.6b00026> , hdl:10013/epic.48945 |
op_doi |
https://doi.org/10.1021/acs.est.6b00026 |
container_title |
Environmental Science & Technology |
container_volume |
50 |
container_issue |
19 |
container_start_page |
10485 |
op_container_end_page |
10493 |
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1810487268131995648 |