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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solution chemistry 11 (1982), S. 79-89 
    ISSN: 1572-8927
    Keywords: Acidic dissociation ; dissociation constant ; ion-ion interactions ; ionization ; morpholinium ion ; salt effect ; seawater ; thermodynamics of dissociation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dissociation constant of morpholinium ion has been determined in five synthetic seawaters at eight temperatures from 5 to 40°C. The seawater solvents contained NaCl, MgCl2, Na2SO4, CaCl2, and KCl in amounts corresponding to salinities of approximately 10, 20, 30, 35, and 40‰ (parts per thousand) and ionic strengths ranging from 0.2 to 0.8 mol-kg−1. Electromotive-force measurements of cells without liquid junction, with hydrogen gas electrodes and Ag/AgCl electrodes, were used to derive the dissociation constant and associated changes of enthalpy, entropy, and heat capacity for the dissociation equilibrium. The pK values over the range of salinity S and thermodynamic temperature T studied are given by the equation $$\begin{gathered} pK = (1396.58 + 1.822S)/T - 2.14236 InT + 16.0138 + 0.001912S \hfill \\ - 9.722 \times 10^{ - 5} S^2 + 1.025 \times 10^{ - 6} S^3 \hfill \\ \end{gathered}$$ At a salinity of 35‰, corresponding to ‘normal seawater’, pK is higher by 0.206 at 25°C than in the water solvent, while ΔHo is increased by 292 cal-mol−1 and both ΔSo and ΔC p o are substantially unchanged. The buffer composed of 0.04 molal morpholinium chloride and 0.04 molal morpholine is useful for pH control in synthetic seawater media.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 34 (2007): L18608, doi:10.1029/2006GL027288.
    Keywords: Carbon dioxide ; Acidification ; Ocean pH
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 3
    Publication Date: 2022-10-26
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Jiang, L.-Q., Pierrot, D., Wanninkhof, R., Feely, R. A., Tilbrook, B., Alin, S., Barbero, L., Byrne, R. H., Carter, B. R., Dickson, A. G., Gattuso, J.-P., Greeley, D., Hoppema, M., Humphreys, M. P., Karstensen, J., Lange, N., Lauvset, S. K., Lewis, E. R., Olsen, A., Pérez, F. F., Sabine, C., Sharp, J. D., Tanhua, T., Trull, T. W., Velo, A., Allegra, A. J., Barker, P., Burger, E., Cai, W-J., Chen, C-T. A., Cross, J., Garcia, H., Hernandez-Ayon J. M., Hu, X., Kozyr, A., Langdon, C., Lee., K, Salisbury, J., Wang, Z. A., & Xue, L. Best practice data standards for discrete chemical oceanographic observations. Frontiers in Marine Science, 8, (2022): 705638, https://doi.org/10.3389/fmars.2021.705638.
    Description: Effective data management plays a key role in oceanographic research as cruise-based data, collected from different laboratories and expeditions, are commonly compiled to investigate regional to global oceanographic processes. Here we describe new and updated best practice data standards for discrete chemical oceanographic observations, specifically those dealing with column header abbreviations, quality control flags, missing value indicators, and standardized calculation of certain properties. These data standards have been developed with the goals of improving the current practices of the scientific community and promoting their international usage. These guidelines are intended to standardize data files for data sharing and submission into permanent archives. They will facilitate future quality control and synthesis efforts and lead to better data interpretation. In turn, this will promote research in ocean biogeochemistry, such as studies of carbon cycling and ocean acidification, on regional to global scales. These best practice standards are not mandatory. Agencies, institutes, universities, or research vessels can continue using different data standards if it is important for them to maintain historical consistency. However, it is hoped that they will be adopted as widely as possible to facilitate consistency and to achieve the goals stated above.
    Description: Funding for L-QJ and AK was from NOAA Ocean Acidification Program (OAP, Project ID: 21047) and NOAA National Centers for Environmental Information (NCEI) through NOAA grant NA19NES4320002 [Cooperative Institute for Satellite Earth System Studies (CISESS)] at the University of Maryland/ESSIC. BT was in part supported by the Australia’s Integrated Marine Observing System (IMOS), enabled through the National Collaborative Research Infrastructure Strategy (NCRIS). AD was supported in part by the United States National Science Foundation. AV and FP were supported by BOCATS2 Project (PID2019-104279GB-C21/AEI/10.13039/501100011033) funded by the Spanish Research Agency and contributing to WATER:iOS CSIC interdisciplinary thematic platform. MH was partly funded by the European Union’s Horizon 2020 Research and Innovation Program under grant agreement N°821001 (SO-CHIC).
    Keywords: Data standard for chemical oceanography ; Discrete chemical oceanographic observations ; Column header abbreviations ; WOCE WHP exchange formats ; Quality control flags ; Content vs. concentration ; CO2SYS ; TEOS-10
    Repository Name: Woods Hole Open Access Server
    Type: Article
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