17G-7 |
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C. P. SAMARANAYAKE and S. K. Sastry. Dept. of Food, Agricultural & Biological Engineering, Ohio State Univ., 590 Woody Hayes Dr., 260 Agricultural Engineering Bldg., Columbus, OH 43210-1058 Information about the behavior of electrode materials under ohmic heating conditions may be helpful to avoid or minimize chemical reactions at electrode/ solution interfaces. We investigated electrochemical behavior of stainless steel, titanium, platinized-titanium, and graphite electrodes at (initial) pH=3.5, 5.0, and 6.5 using 60 Hz (sine wave) alternating current. Analysis of electrode corrosion was performed by inductively coupled plasma (ICP) –mass, and –emission spectrometers. Hydrogen gas accumulation in the headspace of the ohmic heater, and pH change of the heating medium were measured by using hydrogen and pH sensors, respectively. Platinized-titanium was relatively inert at all pH values. Among the materials tested, stainless steel was found to be the most electrochemically active electrode material during 60 Hz ohmic heating.
Session 17G, Food Engineering: Physical, chemical and electrical properties
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