Automated sample processing at the National Ocean Sciences AMS facility

Cohen, Grégory; Hutton, D. L.; Osborne, Elizabeth A.; Reden, Karl F. von; Gagnon, Alan R.; McNichol, Ann P.; Jones, Glenn

doi:10.1016/0168-583x(94)95991-9

Cited by 12 publications

(6 citation statements)

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“…Details of the extraction, counting, etc. are available from Key (1991), McNichol and Jones (1991), Gagnon and Jones (1993), Cohen et al (1994, Osbome et al (1994), Schneider et al (1994) and S6guin et al (1994). All 813C analyses, except for the samples collected by Quay (who extracted and measured his own g13C values), were performed at NOSAMS.…”

Section: Methodsmentioning

confidence: 99%

WOCE Pacific Ocean Radiocarbon Program

Key

1996

Radiocarbon

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Section: Methodsmentioning

confidence: 99%

WOCE Pacific Ocean Radiocarbon Program

Key

1996

Radiocarbon

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“…The line uses a sparging method to extract the sample DIC as carbon dioxide by acidifying the sample and circulating nitrogen gas through it. The extracted CO 2 is then separated cryogenically and stored for further processing (Cohen, et al, 1994). The system provides high yields and produces unfractionated gas that can provide both stable and radiocarbon isotope data.…”

Section: Current Nosams Dic Line Designmentioning

confidence: 99%

“…In order to extract the DIC from the water sample, all inorganic carbon species -dissolved carbon dioxide (C0 2 , aqueous), carbonic acid (H 2 CO 3 ), bicarbonate anions (HC0 3~) , and carbonate anions (CO 3 2-) -are converted to CO 2 gas by acidifying it with a strong acid (Eqn 11). …”

Section: Sample Acidificationmentioning

confidence: 99%

Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating

Gospodinova¹

2012

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The focus of this thesis is the design and development of a system for rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) consists of two subsystems -one for sample introduction, acidification, and carbon dioxide extraction, and one for carbon dioxide quantification and storing. The first subsystem efficiently extracts the dissolved inorganic carbon from the water sample in the form of carbon dioxide by utilizing a gas-permeable polymer membrane contractor. The second subsystem traps, quantifies and stores the extracted gas using cryogenics. The extracted carbon dioxide is further processed for stable and radiocarbon isotope analysis at the National Ocean Sciences Accelerator Mass Spectrometer Facility at the Woods Hole Oceanographic Institution.The REDICS system was tested using seawater standards collected at 470m and 4000m depth in the Atlantic Ocean and analyzing the extracted CO 2 . The results were compared to the results for the same standards processed on the current NOSAMS water stripping line. The results demonstrate that the system successfully extracts more than 99% of the dissolved inorganic carbon in less than 20 minutes. Stable isotope and radiocarbon isotope analyses demonstrated system precision of 0.02%c and 3.5%c respectively.

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“…The samples were poisoned with HgC1, immediately after collection and then returned to the United States for extraction and analysis at NOSAMS. Details of the extraction, counting, etc., are available from Key (1991), McNichol and Jones (1991), Gagnon and Jones (1993), and Cohen et al (1994). The standard used for the 14C measurements is the National Bureau of Standards oxalic acid standard for radiocarbon dating.…”

Section: Radiocarbon Measurementsmentioning

confidence: 99%

Carbon dioxide, hydrographic, and chemical data obtained during the R/V Thomas Washington TUNES-1 in the equatorial Pacific Ocean (WOCE Section P17C)

Goyet

Key

Sullivan

et al. 1997

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This report has been reproduced directly from the best a v a i W copy. The TCO, concentration in 1022 seawater samples was determined by semiautomated coulometry using an improved version of the instrument earlier described by Johnson et al. (1985Johnson et al. ( , 1987. The precision of these measurements was estimated to be better than 20.01%. The desired accuracy was better than 4 pmol/kg.The TALK concentration in 323 seawater samples was determined by an automated potentiometric acid titration system that was described by Bradshaw and Brewer (1988). The precision of the measurements was estimated to be better than 0.1 %.Fifty replicate samples were also collected for later shore-based reference analyses of TCO, and TALK by vacuum extraction and manometry in the laboratory of C. D. Keeling of Scripps Institution of Oceanography.The data set is available, free of charge, as a numeric data package (NDP) from the Carbon Dioxide Information Analysis Center. The NDP consists of two oceanographic data files; two FORTRAN 77 data-retrieval-routine files; a documentation file; and this printed report, which describes the contents and format of all files and the procedures and methods used to obtain the data.Keywords: carbon dioxide; total alkalinity; World Ocean Circulation Experiment (WOCE); Pacific Ocean; hydrographic measurements; carbon cycle ix PART 1: OVERVIEW BACKGROUND INFORMATIONThe World Ocean plays a dynamic role in the Earth's climate: it captures heat from the sun, transports it, and releases it thousands of miles away. These oceanic-solar-atmospheric interactions affect winds, rainfall patterns, and temperatures on a global scale. The Oceans also play a major role in global carbon-cycle processes. Carbon is unevenly distributed in the oceans because of complex circulation patterns and biogeochemical cycles. The oceans are estimated to hold 38,000 gigatons of carbon, 50 times more than that in the atmosphere and 20 times more than plants, animals, and the soil. If only 2% of the carbon stored in the oceans were released, the level of atmospheric carbon dioxide (CO,) would double. Every year, the amount of CO, exchanged across the sea surface is more than 15 times that produced by burning of fossil fuels, deforestation, and other human activities (Williams 1990).To better understand the ocean's role in climate and climatic changes, several large experiments have been conducted, and others are under way. The largest oceanographic experiment ever attempted is the World Ocean Circulation Experiment (WOCE). A major component of the World Climate Research Program, WOCE brings together the expertise of scientists and technicians from more than 30 nations. In the United States, WOCE is supported by the federal government under the Global Change Research Program. The multiagency U.S. effort is led by the National Science Foundation and is supported by major contributions from the National Oceanic and Atmospheric Administration, the U.S. Department of Energy (DOE), the Office of Naval Research, and the National Aer...

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Automated sample processing at the National Ocean Sciences AMS facility

Cited by 12 publications

References 0 publications

WOCE Pacific Ocean Radiocarbon Program

WOCE Pacific Ocean Radiocarbon Program

Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating

Carbon dioxide, hydrographic, and chemical data obtained during the R/V Thomas Washington TUNES-1 in the equatorial Pacific Ocean (WOCE Section P17C)

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