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Technical Note: Evaluation of Between-sample Memory Effects in the Analysis of Δ2H and Δ18O of Water Samples Measured by Laser Spectroscopes : Volume 16, Issue 10 (31/10/2012)

By Penna, D.

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Book Id: WPLBN0004010583
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Technical Note: Evaluation of Between-sample Memory Effects in the Analysis of Δ2H and Δ18O of Water Samples Measured by Laser Spectroscopes : Volume 16, Issue 10 (31/10/2012)  
Author: Penna, D.
Volume: Vol. 16, Issue 10
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Michelini, M., Šanda, M., Wassenaar, L. I., Stenni, B., Bonazza, M., Čejková, B.,...Gobbi, A. (2012). Technical Note: Evaluation of Between-sample Memory Effects in the Analysis of Δ2H and Δ18O of Water Samples Measured by Laser Spectroscopes : Volume 16, Issue 10 (31/10/2012). Retrieved from http://hawaiilibrary.net/


Description
Description: Department of Land, Environment, Agriculture and Forestry, University of Padova, Italy. This study evaluated between-sample memory in isotopic measurements of Δ2H and Δ18O in water samples by laser spectroscopy. Ten isotopically depleted water samples spanning a broad range of oxygen and hydrogen isotopic compositions were measured by three generations of off-axis integrated cavity output spectroscopy and cavity ring-down spectroscopy instruments. The analysis procedure encompassed small (less than 2‰ for Δ2H and 1‰ for Δ18O) and large (up to 201‰ for Δ2H and 25‰ for Δ18O) differences in isotopic compositions between adjacent sample vials. Samples were injected 18 times each, and the between-sample memory effect was quantified for each analysis run. Results showed that samples adversely affected by between-sample isotopic differences stabilised after seven–eight injections. The between-sample memory effect ranged from 14% and 9% for Δ2H and Δ18O measurements, respectively, but declined to negligible carryover (between 0.1% and 0.3% for both isotopes) when the first ten injections of each sample were discarded. The measurement variability (range and standard deviation) was strongly dependent on the isotopic difference between adjacent vials. Standard deviations were up to 7.5‰ for Δ2H and 0.54‰ for Δ18O when all injections were retained in the computation of the reportable Δ-value, but a significant increase in measurement precision (standard deviation in the range 0.1‰–1.0‰ for Δ2H and 0.05‰–0.17‰ for Δ18O) was obtained when the first eight injections were discarded. In conclusion, this study provided a practical solution to mitigate between-sample memory effects in the isotopic analysis of water samples by laser spectroscopy.

Summary
Technical Note: Evaluation of between-sample memory effects in the analysis of Δ2H and Δ18O of water samples measured by laser spectroscopes

Excerpt
Brand W. A., Geilmann, H., Crosson, E. R., and Rella, C. W.: Cavity ring-down spectroscopy versus high-temperature conversion isotope ratio mass spectrometry; a case study on δ2H and δ18O of pure water samples and alcohol/water mixtures, Rapid Commun. Mass Sp., 23, 1879–1884, doi:10.1002/rcm.4083, 2009.; Chesson, L. A., Bowen, G. J., and Ehleringer, J. R.: Analysis of the hydrogen and oxygen stable isotopes ratios of beverage waters without prior water extraction using isotope ratio infrared spectroscopy, Rapid Commun. Mass Sp., 24, 3205–3213, 2010.; Epstein, S. and Mayeda, T. K.: Variations of δ18O of waters from natural sources, Geochim. Cosmochim. Ac., 4, 213–224, 1953.; Gkinis, V., Popp, J. T., Johnsen, S. J., and Blunier, T.: A continuous stream flash evaporator for the calibration of an IR cavity ring-down spectrometer for the isotopic analysis of water, Isot. Environ. Healt. S., 46, 463–475, 2010.; Gonfiantini, R.: Standards for stable isotope measurements in natural compounds, Nature, 271, 534–536, 1978.; Gröning, M.: Improved water δ2H and δ18O calibration and calculation of measurement uncertainty using a simple software tool, Rapid Commun. Mass Sp., 25, 2711–2720, doi:10.1002/rcm.5074, 2011.; Gupta, P., Noone, D., Galewsky, J., Sweeney, C., and Vaughn, B. H.: Demonstration of high-precision continuous measurements of water vapor isotopologues in laboratory and remote field deployments using wavelength-scanned cavity ring-down spectroscopy (WS-CRDS) technology, Rapid Commun. Mass Sp., 23, 2534–2542, 2009.; Horita, J., Ueda, A., Mizukami, K., and Takatori, I.: Automatic δD and δ18O analyses of multi-water samples using H2- and CO2-water equilibration methods with a common equilibration set-up, Appl. Radiat. Isotopes, 40, 801–805, 1989.; IAEA: Reference Sheet for VSMOW2 and SLAP2 international measurement standards, issued 13 February 2009, International Atomic Energy Agency, Vienna, 5 pp., http://nucleus.iaea.org/rpst/Documents/VSMOW2_SLAP2.pdf, 2009a.; IAEA: Laser Spectroscopy Analysis of Liquid Water Samples for Stable Hydrogen and Oxygen Isotopes, Performance Testing and Procedures for Installing and Operating the LGR DT-100 Liquid Water Isotope Analyzer. International Atomic Energy Agency, Vienna, 2009, ISSN 1018-5518, 2009b.; Lis, G., Wassenaar, L. I., and Hendry, M. J.: High precision laser spectroscopy D/H and 18O/16O measurements of microliter natural water samples, Anal. Chem., 80, 287–293, 2008.; Los Gatos Research, Inc.: Liquid-Water Isotope Analyser, Automated Injection, 2008.; Olsen, J., Seierstad, I., Vinther, B., Johnsen, S., and Heinemeier, J.: Memory effect in deuterium analysis by continuous flow isotope ratio measurement, Int. J. Mass Spectrom., 254, 44–52, 2006.; Penna, D., Stenni, B., Šanda, M., Wrede, S., Bogaard, T. A., Gobbi, A., Borga, M., Fischer, B. M. C., Bonazza, M., and Chárová, Z.: On the reproducibility and repeatability of laser absorption spectroscopy measurements for δ2H and δ18O isotopic analysis, Hydrol. Earth Syst. Sci., 14, 1551–1566, doi:10.5194/hess-14-1551-2010, 2010.; Picarro, Inc.: Picarro L1102- i Isotopic Water Liquid Analyzer, 2008.; Sayres, D. S., Moyer, E. J., Hanisco, T. F., St. Clair, J. M., Keutsch, F. N., O'Brien, A., Allen, N. T., Lapson, L., Demusz, J. N., Rivero, M., Martin, T., Greenberg, M., Tuozzolo, C., Engel, G. S., Kroll, J. H., Paul, J. B., and Anderson, J. G.: A new cavity based absorption instru

 

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