caa a22 4500 463220633 CHVBK 20180405153211.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1134/S1061934807020177 doi (NATIONALLICENCE)springer-10.1134/S1061934807020177 Some aspects of the determination of water by the karl fisher method [Elektronische Daten] [T. Blank, L. Eksperiandova, K. Ostras'] Conditions for eliminating systematic errors and minimizing random errors in the determination of water in methanol and α-alumina using Karl Fisher reagent with visual end-point detection are studied. The concentration dependence of the relative standard deviation of the determination of water by the Karl Fisher method is found to be linear in RSD-1/c coordinates. To exclude the effect of moisture contained in the titration flask, it is suggested to bind water with a titrant in the presence of a small amount of methanol. The methanol effect (that is, the dependence of the titration results on the water: methanol ratio and the total amount of the titrated water-methanol mixture) is shown to be eliminated in the presence of the products of water interaction with Karl Fisher reagent that form on the water binding stage. It is found that the use of a background dye, methylene blue, eliminates significant systematic errors in the determination of water by the Karl Fisher method, particularly, at low concentrations. It is noted that the visual detection of the titration end-point has some advantages over the automated electrometric versions of the method; in particular, it is characterized by a better reproducibility of the determination of low concentrations of water. Pleiades Publishing, Ltd., 2007 Blank T. Institute for Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, 61001, Khar'kov, Ukraine aut Eksperiandova L. Institute for Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, 61001, Khar'kov, Ukraine aut Ostras' K. Institute for Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, 61001, Khar'kov, Ukraine aut Journal of Analytical Chemistry Nauka/Interperiodica 62/2(2007-02-01), 193-198 1061-9348 62:2<193 2007 62 10809 https://doi.org/10.1134/S1061934807020177 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807020177 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Blank T. Institute for Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, 61001, Khar'kov, Ukraine aut NATIONALLICENCE 700 1- Eksperiandova L. Institute for Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, 61001, Khar'kov, Ukraine aut NATIONALLICENCE 700 1- Ostras' K. Institute for Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, 61001, Khar'kov, Ukraine aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/2(2007-02-01), 193-198 1061-9348 62:2<193 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer