naa a22 4500 510761445 CHVBK 20180411083140.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1134/S0040601513070094 doi (NATIONALLICENCE)springer-10.1134/S0040601513070094 Experimental investigations of the effect the electrical conductivity of medium has on the performance of pH meters [Elektronische Daten] [A. Rodionov, S. Karashchuk] Results from tests of pH meters carried out in ammonia media having low electric conductivity (less than 5.0 μS/cm) are presented. The check media for the tests were prepared in a special manner the use of which makes it possible to reproduce the pH value of solution with an error not exceeding ∼0.04pH in the range of electrical conductivities above 0.1 μS/cm. The instrument measurement error was determined at different electrical conductivities of medium. Different electrodes were tested, the majority of which were domestically produced ones intended for general industrial applications. Some results were also obtained for one dedicated electrode from a foreign manufacturer. The test results show that the instrument gives a biased pH value for such media. The bias has a random value, which nonetheless is stable in the majority of cases, depends on the electrical conductivity of medium being monitored, and may be quite essential for small electrical conductivities (0.5pH or more). A conclusion is drawn about the need to calibrate the instruments with respect to standard media having electrical conductivity close to that of the medium being monitored. Analytic relations characterizing the check media used fort tests (check solutions) are presented. Pleiades Publishing, Ltd., 2013 weakly conducting media nationallicence pH measurement error nationallicence biased pH estimate nationallicence checking nationallicence calibration of pH meters nationallicence weakly conducting standard solutions nationallicence calculating the pH value of standard solution nationallicence Rodionov A. Vzor, P.O.B. 253, 603106, Nizhni Novgorod, Russia aut Karashchuk S. Vzor, P.O.B. 253, 603106, Nizhni Novgorod, Russia aut Thermal Engineering SP MAIK Nauka/Interperiodica 60/7(2013-07-01), 487-492 0040-6015 60:7<487 2013 60 11509 https://doi.org/10.1134/S0040601513070094 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0040601513070094 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rodionov A. Vzor, P.O.B. 253, 603106, Nizhni Novgorod, Russia aut NATIONALLICENCE 700 1- Karashchuk S. Vzor, P.O.B. 253, 603106, Nizhni Novgorod, Russia aut NATIONALLICENCE 773 0- Thermal Engineering SP MAIK Nauka/Interperiodica 60/7(2013-07-01), 487-492 0040-6015 60:7<487 2013 60 11509 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer