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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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There is substantial evidence of the complexity of selenium speciation in living organisms and of the importance of the selective determination of the particular species of this element in order to understand its metabolism and biological significance in clinical chemistry, biology, toxicology, and nutrition.
The state-of-the-art of analytical techniques available for this purpose is critically evaluated with particular emphasis on the element-selective detection and identification of the detected selenium compounds. Whereas there are a number of techniques available that are able to detect various selenium species in living organisms selectively, few techniques exist that are able to identify and to characterize the species detected.

Pure Appl. Chem., Vol. 72, No. 3, pp. 447–461, 2000.
IUPAC Technical Report
© 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