مقاله Experimental investigations of the effect the electrical conductivity of medium has on the performance of pH meters : تی پی بین

خلاصه مقاله

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.

نویسندگان

A. K. Rodionov [ Vzor, P.O.B. 253, Nizhni Novgorod, 603106, Russia ]

S. A. Karashchuk [ Vzor, P.O.B. 253, Nizhni Novgorod, 603106, Russia ]

کلمات کلیدی

weakly conducting media pH measurement error biased pH estimate checking calibration of pH meters weakly conducting standard solutions calculating the pH value of standard solution

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Thermal Engineering 2013

Thermal Engineering (Teploenergetika) is the most widely read Russian publication concerned with thermal energy and engineering. The articles published analyze the current state and perspectives of energy development, design and operation of power engineering equipment such as that at thermal and nuclear power stations, energy conservation and pollution control, the theoretical fundamentals of heat engineering, and non-traditional heat sources.

حوزه های تحت پوشش : Engineering Thermodynamics, Heat and Mass Transfer