Detecting method for residual glyoxal content in ethoxyl/hydroxypropyl methyl cellulose
A technology of hydroxypropyl methylcellulose and detection method, which is applied in the measurement of color/spectral characteristics, measurement device, preparation of samples for testing, etc., to achieve the effects of high measurement accuracy and improved environmental protection quality
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[0025] In order to describe in detail the technical content, structural features, achieved objectives and effects of the present invention, the following will be described in detail in conjunction with the embodiments.
[0026] A detection method for residual glyoxal content in hydroxyethyl / hydroxypropyl methylcellulose, comprising the steps:
[0027] a. Preparation of phenol reagent solution: Weigh 0.200 g of phenol reagent, add 40.0 g of glacial acetic acid, dilute to 50 ml with deionized water, and store in the refrigerator for later use;
[0028] b. Preparation of 5mg / L glyoxal standard solution: weigh 1.25g glyoxal solution with a mass fraction of 40%, accurate to 0.001g, dilute to 1L with deionized water, then pipette 10.00ml solution, and use Dilute to 1L with deionized water, set aside;
[0029] c. Weigh 1.0 g of hydroxyethyl / hydroxypropyl methylcellulose sample, accurate to 0.0001 g, into a 100 ml beaker, add 50 ml of tetrahydrofuran, and stir at a low speed to disso...
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