Thermodynamic studies of the carbonate system in seawater
Laboratory measurements of the components of the carbonate system (pH, fCO(2), TCO2 and TA) were made on Gulf Stream seawater and Certified Reference Material (CRM) as a function of salinity (33-37), temperature (0-40 degrees C) and the ratio TA/TCO2 (1.02 to 1.25). The pH (+/-0.002) was determined...
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PERGAMON-ELSEVIER SCIENCE LTD
1995
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ftponangunivst:oai:oasis.postech.ac.kr:2014.oak/28239 2023-05-15T15:53:03+02:00 Thermodynamic studies of the carbonate system in seawater Lee, K Millero, FJ 환경공학부 10056383 Lee, K 1995-11 https://oasis.postech.ac.kr/handle/2014.oak/28239 https://doi.org/10.1016/0967-0637(95)00077-1 English eng PERGAMON-ELSEVIER SCIENCE LTD DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 42 11-12 2035 2061 SCI급, SCOPUS 등재논문 SCI Oceanography 0967-0637 1995-OAK-0000018469 https://oasis.postech.ac.kr/handle/2014.oak/28239 doi:10.1016/0967-0637(95)00077-1 20719 DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.42, no.11-12, pp.2035 - 2061 A1995TM66900012 APPARENT DISSOCIATION-CONSTANTS ION CONCENTRATION SCALE SEA-WATER BORIC-ACID 273.15-K 318.15-K BUFFERS MEDIA Article ART 1995 ftponangunivst https://doi.org/10.1016/0967-0637(95)00077-1 2022-10-20T20:18:21Z Laboratory measurements of the components of the carbonate system (pH, fCO(2), TCO2 and TA) were made on Gulf Stream seawater and Certified Reference Material (CRM) as a function of salinity (33-37), temperature (0-40 degrees C) and the ratio TA/TCO2 (1.02 to 1.25). The pH (+/-0.002) was determined by spectrophotometry; the fCO(2) (+/-2 mu atm) with an infrared detector; the TCO2(+/- 2 mu mol kg(-1)) by coulometry; and the TA (+/-2 mu mol kg(-1)) by potentiometric titrations. The results were used to examine the internal consistency of the thermodynamics of the carbonate system by calculation of various parameters (e.g., TA) from two input parameters (e.g., pH-TCO2). The measurements on CRMs at 25 degrees C were found to be consistent with the thermodynamic constants of Goyet and Poisson (1989) and Roy el al. (1993) to +/-0.005 in pH, +/-3 mu mol kg(-1) in TCO2 and +/-3 mu mol kg(-1) in TA. The measurements on Gulf Stream seawater from 0 to 40 degrees C were also found to be consistent in pH to +/-0.006, in TCO2 to +/-4 mu mol kg(-1) and in TA to +/-4 mu mol kg(-1) when these constants were used. The pH and fCO(2) were measured on seawater with a known TA and TCO2 from 5 to 35 degrees C. The results give slopes of (d In fCO(2) dr) x 10(2) = 4.26 +/- 0.03 and (dpH/dt) x 10(2) = 1.65 +/- 0.01, in agreement with the values calculated from the thermodynamic constants of Roy el al. (1993) and Goyet and Poisson (1989) over the same temperature range. The measured fugacities were internally consistent to +/-7 mu atm with the values calculated with these same constants and with pH-TA or pH-TCO2 as input parameters. All of these laboratory measurements indicate that the carbonic acid dissociation constants of Rov et al. (1993) and Goyet and Poisson (1989) give the best description of the thermodynamics of the CO2 system in seawater over temperature from 0 to 40 degrees C, salinity from 33 to 37 and the ratio TA/TCO2 from 1.02 to 1.25. By using the pK(1) determined from the equations of Roy et al. (1993), we have used our ... Article in Journal/Newspaper Carbonic acid Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) Deep Sea Research Part I: Oceanographic Research Papers 42 11-12 2035 2061 |
institution |
Open Polar |
collection |
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) |
op_collection_id |
ftponangunivst |
language |
English |
topic |
APPARENT DISSOCIATION-CONSTANTS ION CONCENTRATION SCALE SEA-WATER BORIC-ACID 273.15-K 318.15-K BUFFERS MEDIA |
spellingShingle |
APPARENT DISSOCIATION-CONSTANTS ION CONCENTRATION SCALE SEA-WATER BORIC-ACID 273.15-K 318.15-K BUFFERS MEDIA Lee, K Millero, FJ Thermodynamic studies of the carbonate system in seawater |
topic_facet |
APPARENT DISSOCIATION-CONSTANTS ION CONCENTRATION SCALE SEA-WATER BORIC-ACID 273.15-K 318.15-K BUFFERS MEDIA |
description |
Laboratory measurements of the components of the carbonate system (pH, fCO(2), TCO2 and TA) were made on Gulf Stream seawater and Certified Reference Material (CRM) as a function of salinity (33-37), temperature (0-40 degrees C) and the ratio TA/TCO2 (1.02 to 1.25). The pH (+/-0.002) was determined by spectrophotometry; the fCO(2) (+/-2 mu atm) with an infrared detector; the TCO2(+/- 2 mu mol kg(-1)) by coulometry; and the TA (+/-2 mu mol kg(-1)) by potentiometric titrations. The results were used to examine the internal consistency of the thermodynamics of the carbonate system by calculation of various parameters (e.g., TA) from two input parameters (e.g., pH-TCO2). The measurements on CRMs at 25 degrees C were found to be consistent with the thermodynamic constants of Goyet and Poisson (1989) and Roy el al. (1993) to +/-0.005 in pH, +/-3 mu mol kg(-1) in TCO2 and +/-3 mu mol kg(-1) in TA. The measurements on Gulf Stream seawater from 0 to 40 degrees C were also found to be consistent in pH to +/-0.006, in TCO2 to +/-4 mu mol kg(-1) and in TA to +/-4 mu mol kg(-1) when these constants were used. The pH and fCO(2) were measured on seawater with a known TA and TCO2 from 5 to 35 degrees C. The results give slopes of (d In fCO(2) dr) x 10(2) = 4.26 +/- 0.03 and (dpH/dt) x 10(2) = 1.65 +/- 0.01, in agreement with the values calculated from the thermodynamic constants of Roy el al. (1993) and Goyet and Poisson (1989) over the same temperature range. The measured fugacities were internally consistent to +/-7 mu atm with the values calculated with these same constants and with pH-TA or pH-TCO2 as input parameters. All of these laboratory measurements indicate that the carbonic acid dissociation constants of Rov et al. (1993) and Goyet and Poisson (1989) give the best description of the thermodynamics of the CO2 system in seawater over temperature from 0 to 40 degrees C, salinity from 33 to 37 and the ratio TA/TCO2 from 1.02 to 1.25. By using the pK(1) determined from the equations of Roy et al. (1993), we have used our ... |
author2 |
환경공학부 10056383 Lee, K |
format |
Article in Journal/Newspaper |
author |
Lee, K Millero, FJ |
author_facet |
Lee, K Millero, FJ |
author_sort |
Lee, K |
title |
Thermodynamic studies of the carbonate system in seawater |
title_short |
Thermodynamic studies of the carbonate system in seawater |
title_full |
Thermodynamic studies of the carbonate system in seawater |
title_fullStr |
Thermodynamic studies of the carbonate system in seawater |
title_full_unstemmed |
Thermodynamic studies of the carbonate system in seawater |
title_sort |
thermodynamic studies of the carbonate system in seawater |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
1995 |
url |
https://oasis.postech.ac.kr/handle/2014.oak/28239 https://doi.org/10.1016/0967-0637(95)00077-1 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 42 11-12 2035 2061 SCI급, SCOPUS 등재논문 SCI Oceanography 0967-0637 1995-OAK-0000018469 https://oasis.postech.ac.kr/handle/2014.oak/28239 doi:10.1016/0967-0637(95)00077-1 20719 DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.42, no.11-12, pp.2035 - 2061 A1995TM66900012 |
op_doi |
https://doi.org/10.1016/0967-0637(95)00077-1 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
42 |
container_issue |
11-12 |
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2035 |
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2061 |
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1766388116280573952 |