CODATA key values

Cox, J. D., D. D. Wagman, and V. A. Medvedev, CODATA Key Values for-Thermodynamics, Hemisphere Publishing Corp., New York, 1989. Danner, R. P, and T. E. Daubert, Manual for Pr edicting Chemical Pr ocess Design Data, Design Institute for Physical Property Data, AlChE, New York, extant 1989. 

The choice of a given database as source of auxiliary values may not be straightforward, even for a thermochemist. Consistency is a very important criterion, but factors such as the publication year, the assignment of an uncertainty to each value, and even the scientific reputation of the authors or the origin of the database matter. For instance, it would not be sensible to use the old NBS Circular 500 [22] when the NBS Tables of Chemical Thermodynamic Properties [17], published in 1982, is available. If we need a value for the standard enthalpy of formation of an organic compound, such as ethanol, we will probably prefer Pedley s Thermodynamic Data and Structures of Organic Compounds [15], published in 1994, which reports the error bars. Finally, if we are looking for the standard enthalpy of formation of any particular substance, we should first check whether it is included in CODATA Key Values for Thermodynamics [16] or in the very recent Active Thermochemical Tables [23,24],... 

J.D. Cox, D.D. Wagman, and V.A. Medvedev, CODATA key values for thermodynamics (Hemisphere, New York, 1989). [Data also available online at http //www.codata.org/codata/databases/keyl.html]... 

Cox J. D., Wagman D. D., and Medvedev V. A. (1989) CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., 271pp. 

Although the focus of this review is on selenium, it is necessary to use data on a number of other species during the evaluation process that lead to the recommended data. These so-called auxiliary data are taken both from the publication of CODATA Key Values [89COX/WAG] and from the evaluation of additional auxiliary data in the volume on uranium [92GRE/FUG] and the succeeding volumes noted in Section I.l,... 

Chapter IV contains, for auxiliary compounds and complexes that do not contain selenium, a table of the thermodynamic data for individual species (Table IV-1) and a table of reaction data (Table IV-2). Most of these values are the CODATA Key Values [89COX/WAG]. The selection of the remaining auxiliary data is discussed in [92GRE/FUG], and other preceding volumes of this series. As just mentioned, Appendix E contains a table. Table E-1, of the adopted thermodynamic data for individual selenium compounds calculated with auxiliary data not contained in Chapter IV. The non-TDB auxiliary data, usually from [82WAG/EVA], are presented in Table E-2 and the evaluations are discussed in Chapter V and Appendix A. 

The values in the tables of this chapter are either CODATA Key Values, taken from [89COX/WAG], or were evaluated within the NEA s TDB project, as described in the corresponding chapters of the uranium review [92GRE/FUG], the technetium review [99RAR/RAN], the Update review [2003GUI/FAN], the nickel review [2005GAM/BUG] and the present review. 

Table IV-1 Selected thermodynamic data for auxiliary compounds and complexes adopted in the NEA-TDB project, including the CODATA Key Values [89COX/WAG]. All ionic species listed in this table are aqueous species. Unless noted otherwise, all data refer to 298.15 K and a pressure of 0.1 MPa and, for aqueous species, a standard state of infinite dilution (/ = 0). The uncertainties listed below each value represent total uncertainties and correspond in principle to the statistically defined 95% confidence interval. Values in bold typeface are CODATA Key Values and are taken directly from Ref [89COX/WAG] without further evaluation. Values obtained from internal calculation, cf. footnotes (a) and (b), are rounded at the third digit after the decimal point. Systematically, all the values are presented with three digits after the decimal point, regardless of the significance of these digits. The reference listed for each entry in this table indicates the NEA-TDB Review where the corresponding data have been adopted as NEA-TDB auxiliary data. The data presented in this table are available on computer media from the OECD Nuclear Energy Agency.

The recommended thermodynamic data are the result of a critical assessment of published information. The values in the auxiliary data set, see Tables lV-1 and lV-2 have been adopted from CODATA key values or have been critically reviewed in this or earlier volumes of the series. 

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