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  Novel silver-tubing method for quantitative introduction of water into high-temperature conversion systems for stable hydrogen and oxygen isotopic measurements

Qi, H. P., Groning, M., Coplen, T. B., Buck, B., Mroczkowski, S. J., Brand, W. A., et al. (2010). Novel silver-tubing method for quantitative introduction of water into high-temperature conversion systems for stable hydrogen and oxygen isotopic measurements. Rapid Communications in Mass Spectrometry, 24(13), 1821-1827. doi:10.1002/rcm.4559.

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 Creators:
Qi, H. P., Author
Groning, M., Author
Coplen, T. B., Author
Buck, B., Author
Mroczkowski, S. J., Author
Brand, Willi A.1, Author           
Geilmann, Heike1, Author           
Gehre, M., Author
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1Service Facility Stable Isotope, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497772              

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Free keywords: organic-substances delta-o-18 flow pyrolysis precision nitrate
 Abstract: A new method to seal water in silver tubes for use in a TC/EA (thermal conversion/elemental analyzer) reduction unit using a semi-automated sealing apparatus can yield reproducibilities (1 standard deviation) of delta H-2 and delta O-18 measurements of 1.0 parts per thousand and 0.06 parts per thousand, respectively. These silver tubes containing reference waters may be preferred for the calibration of H- and O-bearing materials analyzed with a TC/EA reduction unit. The new sealing apparatus employs a computer-controlled stepping motor to produce silver tubes identical in length. The reproducibility of the mass of water sealed in tubes (in a range of 200-400 mu g) can be as good as 1%. Approximately 99% of the sealed silver tubes are satisfactory (leak free). Although silver tubes sealed with reference waters are robust and can be shaken or heated to 110 degrees C with no loss of integrity, they should not be frozen because the expansion during the phase transition of water to ice will break the cold seals and all the water will be lost. The tubes should be shipped in insulated containers. This new method eliminates air inclusions and isotopic fractionation of water associated with the loading of water into capsules using a syringe. The method is also more than an order of magnitude faster than preparing water samples in ordinary Ag capsules. Nevertheless, some laboratories may prefer loading water into silver capsules because expensive equipment is not needed, but users of this method are cautioned to apply the necessary corrections for evaporation, back exchange with laboratory atmospheric moisture, and blanks. Copyright (C) 2010 John Wiley & Sons, Ltd.

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Language(s): eng - English
 Dates: 2010
 Publication Status: Issued
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1002/rcm.4559
ISI: ://000279375700001
Other: BGC1375
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Title: Rapid Communications in Mass Spectrometry
Source Genre: Journal
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Publ. Info: New York, NY : John Wiley & Sons
Pages: - Volume / Issue: 24 (13) Sequence Number: - Start / End Page: 1821 - 1827 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925574961
ISSN: 0951-4198