Method for testing substitution degree of sodium carboxymethylcellulose
A sodium carboxymethyl cellulose, weighing technology, applied in the preparation of test samples, thermal excitation analysis, material excitation analysis, etc. Simple, shortened detection time, high accuracy
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Embodiment 1
[0039] A method for testing the degree of substitution of sodium carboxymethyl cellulose, comprising the following steps:
[0040] S1, weigh about 0.5g sample on the filter membrane of the suction filtration device; pour absolute ethanol into the funnel for washing, stir the sample evenly and then suction filter, repeat washing three times until the sample does not contain chloride ions. It is desirable to add 1 drop of silver nitrate solution and 1 drop of potassium chromate solution to the filtrate to detect chloride ions. Since the solubility of silver chloride is less than that of silver chromate, potassium chromate is used as an indicator. Chloride ions first react with silver nitrate A white precipitate is formed, and after the chloride ion reaction is completed, silver nitrate reacts with potassium chromate to form a brick red precipitate of silver chromate. That is, if there is a brick red precipitate, it means that there is no chloride ion in the CMC, and the sample h...
Embodiment 2
[0054] The difference from Example 1 is that the samples weighed in step S3 and the digestion time are different.
[0055] S3, Accurately weigh 0.7000g of the dried sample, which must be accurate to 0.0001g, put it into a polytetrafluoroethylene digestion tank, then take 10ml of concentrated nitric acid and add it to the digestion tank, after assembling the digestion tank, put it Put it into the cavity of the microwave digestion instrument, select the microwave digestion program to run, and it will automatically cool down after the digestion program is finished. There is no need to add other operation steps in the middle, the operation is simple, and the digestion duration is about 2.5h. Wherein, the sodium element content C tested by the ICP spectrometer is 2.5mg / L.
[0056] The rest are the same as in Embodiment 1, and will not be repeated here.
Embodiment 3
[0058] The difference from Example 1 is that the samples weighed in step S3 and the digestion time are different.
[0059] S3, accurately weigh 0.0500g of the dried sample, accurate to 0.0001g, put it into the polytetrafluoroethylene digestion tank, then take 10ml of concentrated nitric acid and add it to the digestion tank, after assembling the digestion tank, put it Put it into the cavity of the microwave digestion instrument, select the microwave digestion program to run, and it will automatically cool down after the digestion program is finished. There is no need to add other operation steps in the middle, the operation is simple, and the digestion duration is about 0.8h. Wherein, the sodium element content C tested by the ICP spectrometer is 2.5mg / L.
[0060] The rest are the same as in Embodiment 1, and will not be repeated here.
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