Wyniki wyszukiwania - BazTech

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Badania nad wpływem rozpuszczalnika na wiarygodność wyników oznaczenia liczby zasadowej

Kowalczyk A.

Nafta-Gaz

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2015

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R. 71, nr 4

266--272

PL

Przeanalizowano wyniki międzynarodowych badań okrężnych organizowanych przez IIS (Institute for Interlaboratory Studies) z okresu ostatnich sześciu lat pod kątem precyzji metod oznaczania całkowitej liczby zasadowej (CLZ). Badania 25 próbek świeżych olejów silnikowych oraz 6 próbek olejów silnikowych z eksploatacji wykonano trzema znormalizowanymi metodykami badawczymi, różniącymi się składem użytego rozpuszczalnika. W zależności od zastosowanej metodyki badawczej zauważono różnice rozpuszczalności badanych próbek, co w rezultacie skutkuje uzależnieniem otrzymywanego wyniku, czyli liczby zasadowej, od zastosowanego rozpuszczalnika.

EN

The results of international round robin tests organized by the IIS (Institute for Interlaboratory Studies) within the period of the past six years were analyzed in terms of precision for the determination of the Total Base Number (TBN). The tests were performed for the determination of the base number by three standardized research methods, differing in the solvent used, for 25 samples of fresh/unused motor oils, and 6 samples of used motor oils. Differences in the solubility of samples tested according to these methods were observed. The TBN value obtained results from the solvent used.

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Potentiometric oxygen sensor with solid state reference electrode

Dunst K., Jasinski G., Jasinski P.

Metrology and Measurement Systems

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2014

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Vol. 21, nr 2

205--216

EN

The concentration or the partial pressure of oxygen in an environment can be determined using different measuring principles. For high temperature measurements of oxygen, ceramic-based sensors are the most practical. They are simple in construction, exploration and maintenance. A typical oxygen potentiometric sensor consists of an oxygen ion conducting solid electrolyte and two electrodes deposited on the two sides of the electrolyte. In this paper different structures of potentiometric oxygen sensors with a solid state reference electrode were fabricated and investigated. The fabricated structures consisted of oxygen ion conducting solid electrolyte from yttria stabilized zirconia, a sensing platinum electrode and nickel-nickel oxide reference electrode. The mixture of nickel-nickel oxide was selected as the reference electrode because it provides reliable electrochemical potential in contact with oxygen conducting electrolyte. To avoid oxidation of nickel the reference electrode is sealed from ambient and the mixture of nickel-nickel oxide was formed electrochemically from nickel oxide after sealing. The effectiveness of the sealing quality and the effectiveness of nickel-nickel oxide mixture formation was investigated by impedance spectroscopy.

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Study on Organic Nitrates. Part VII. New Nitrate Derivatives of 6-Oxo-1,2,3,4-tetrahydro-6H-pyrimido[2,1-b]quinazoline. Potential NO Donors

Korzycka L.

Polish Journal of Chemistry

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2003

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Vol. 77 / nr 5

557-563

EN

A series of potential NO donors derivatives of 6-oxo-1,2,3,4-tetrahydro-6H-pyrimido[ 2,1-b]quinazoline with the structure of organic nitrates was obtained. They were tested in vitro potentiometrically in the reaction with sulfhydryl compound L-cysteine hydrochloride monohydrate.