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New Chromogenic Azothiacrown Ethers -Synthesis and Properties. -The new macrocycles, e.g. (V) and (VI), are prepared by the route shown in the scheme and applied as ion carriers in ion-selective membrane electrodes.Some stability constants are determined. -(SZCZYGELSKA-TAO, J.; BIERNAT, J. F.; Pol. J. Chem. 76 (2002) 7, 931-936; Dep. Chem. Technol., Tech. Univ. Gdansk, PL-80-952 Gdansk, Pol.; EN)

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Applicability of glass fiber as a support material for generation of gaseous standard mixtures using thermal decomposition of the surface compound. Calibration of analytical equipmentThe use of glass fiber as a support material for a surface compound serving to generate gaseous standard mixtures of ethene is described. The technique is based on the process of thermal decomposition of the surface compound in a desorber connected on-line via a multi-port valve to the calibrated device. The surface compound undergoes thermal decomposition at 2458C, yielding known amounts of ethene. The method enables on-line preparation of a standard mixture immediately before the calibration step. Consequently, it can be also applied for the generation of standard mixtures containing volatile, malodorous, unstable, and toxic compounds.