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COMPOSITION OF PH INDICATOR WITH REGULATED CHANGE OF COLOR AND PH DURING COOLING AND PROCESS FOR THE PREPARATION THEREOF
COMPOSITION OF PH INDICATOR WITH REGULATED CHANGE OF COLOR AND PH DURING COOLING AND PROCESS FOR THE PREPARATION THEREOF
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机译:pH指示剂的组成及其在冷却过程中色度和pH值的变化规律及其制备方法
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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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