Error analysis of surface area determinations by the chromatographic technique

The systematic and random errors in the determination of the surface area of adsorbents and catalysts by argon thermodesorption chromatography are analyzed.

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Evaluation of ion chromatography for determination of selected ions in geothermal well water

Ion chromatography is evaluated as a technique for the separation and determination of selected anions (fluoride, chloride, bromide, and sulfate) and cations (lithium. sodium, potassium and ammonium) in geothermal well water samples. The results achieved are compared with those obtained by other methods of analysis in a round-robin test.     

IR spectra of selenophenopyrylium salts

On the basis of the IR spectra of 16 alkyl-substituted selenopheno[2,3-c]- and selenopheno-[3,2-c]pyrylium salts and a model calculation of the frequencies and the forms of their normal vibrations, an assignment of the frequencies of the skeletal vibrations of the heterocycles is put forward.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1495–1497, November, 1973.