CO2 sensitive indicator and preparation method thereof

Abstract

The invention provides a CO2 sensitive indicator and a preparation method thereof. The CO2 sensitive indicator comprises the following ingredients by mass percent: 0.001 to 0.021 percent of methyl red, 0.002 to 0.025 percent of bromothymol blue, 3 to 9 percent of ethanol and the balance being pure water with pH value of 7. The preparation method comprises the following steps: mixing ethanol and water to form a 50% to 85% ethanol solution a and a 5% to 60% ethanol solution b at room temperature; adding methyl red into the ethanol solution a, mixing and uniformly stirring to obtain a methyl red ethanol solution, adding bromothymol blue into the ethanol solution b, and mixing and uniformly stirring to obtain a bromothymol blue ethanol solution; and adding the methyl red ethanol solution and the bromothymol blue ethanol solution into the pure water with pH value of 7 to obtain the CO2 sensitive indicator. The indicator is suitable for repaid detection on CO2 with the content of 0 to 100 percent in an environment.

Description

technical field [0001] The invention relates to an indicator product, in particular to a CO 2 Sensitive indicator and its preparation method. Background technique [0002] At present, during the controlled atmosphere storage of fruits and vegetables, the CO in the storage environment 2 The detection mainly adopts the gas detector, which is difficult to operate, and the detection operation is affected by human factors. The speed of gas passing through the detection trachea varies from person to person, which brings inconvenience to the use. The object of the present invention is to provide a CO 2 Sensitive indicator that automatically detects CO in the storage environment 2 Concentration, no need for manual operation by the operator, greatly reducing the influence of human factors in the detection process, just put it in the storage environment, easy to use. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the ab...

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Problems solved by technology

[0002] At present, during the controlled atmosphere storage of fruits and vegetables, the CO in the storage environment 2 The detection mainly adopts the gas detector, which is difficult to operate, and the detection operation is affected by human factors. The speed of gas passing through the detection trachea varies from person to person, which brings inconvenience to the use.

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