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Ph - indicator with a controlled change of color and ph - value during the freezing and process for its production
Ph - indicator with a controlled change of color and ph - value during the freezing and process for its production
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机译:Ph指示剂,在冷冻和生产过程中具有可控制的颜色和ph值变化
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摘要
PH indicator composition has controlled change of color at a selected sub-freezing temperature. The composition comprises at least one pH indicator, a buffer solution containing at least one inorganic ion in solution and a control agent or a precursor of a control agent. The buffer solution has a pH capable of changing when the temperature of the buffer solution is lowered to below freezing. The control agent is capable of effecting a change in ionic strength and proton composition of the frozen pH indicator composition to thereby control the temperature at which the color change occurs. A method of using the composition comprises lowering the temperature from a first temperature above freezing to a second temperature at which the pH indicator composition is in a substantially frozen state. The composition is particularly useful in a color change thermometer.
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