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This paper presents definitions of concepts related to speciation of elements, more particularly speciation analysis and chemical species. Fractionation is distinguished from speciation analysis, and a general outline of fractionation procedures is given. We propose a categorization of species according to isotopic composition of the element, its oxidation and electronic states, and its complex and molecular structure. Examples are given of methodological approaches used for speciation analysis. A synopsis of the methodology of dynamic speciation analysis is also presented.

Pure Appl. Chem., Vol. 72, No. 8, pp. 1453–1470, 2000.
IUPAC Recommendations 2000
© 2000 IUPAC
IUPAC permission is acknowledged

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Measurements of the spontaneous fission half-lives of nuclides of elements Z = 82 through 109 have been compiled (cutoff date of April 1998) and evaluated. Recommended values are tabulated along with total half-lives.

Pure Appl. Chem., Vol. 72, No. 8, pp. 1525–1562, 2000.
IUPAC Technical Report
© 2000 IUPAC
IUPAC permission is acknowledged