Method of analyzing content of anions in citric acid-containing solution
A citric acid solution and analysis method technology, applied in the direction of analysis materials, measuring devices, material separation, etc., can solve the problems of time-consuming and labor-intensive operation, long detection process, complicated operation process, etc., and achieve short detection time and determination of content Wide range and accurate test results
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Embodiment 1
[0046] This embodiment is used to illustrate the analysis method of the anion content in the solution containing citric acid provided by the present invention.
[0047] (1) Take 2 mL of citric acid acid solution, accurate to 0.01 mL, add 20 mL of high-purity water, and add 40% by weight sodium hydroxide aqueous solution dropwise at a rate of 20 drops / minute under stirring conditions, and use pH test paper while adding Measure the pH value, when the pH value is 5, add high-purity water and adjust the pH value with 1% by weight aqueous sodium hydroxide solution, set the volume to 100mL and make the pH value reach 7.2 at the same time, shake well for later use.
[0048] (2) Use a syringe to take 2ml of the solution obtained in step (1), filter it with a 0.2um membrane, and inject it into the ion chromatograph, and then pass it into the eluent NaOH aqueous solution in sequence. The concentration of the eluent is 10mM, 30mM, 60mM, 10mM, relative to each milliliter of citric acid ac...
Embodiment 2
[0050] This embodiment is used to illustrate the analysis method of the anion content in the solution containing citric acid provided by the present invention.
[0051] (1) Take 2 mL of citric acid acid solution, accurate to 0.01 mL, add 20 mL of high-purity water, and add 40% by weight sodium hydroxide aqueous solution dropwise at a rate of 20 drops / minute under stirring conditions, and use pH test paper while adding Measure the pH value, when the pH value is 6, add high-purity water and adjust the pH value with 1% by weight aqueous sodium hydroxide solution, set the volume to 100mL and make the pH value reach 7.9 at the same time, shake well for later use.
[0052] (2) Use a syringe to take 2ml of the solution obtained in step (1), filter it with a 0.2um membrane, and inject it into the ion chromatograph, then pass it into the eluent NaOH aqueous solution, the concentration of the eluent is 20mM, 40mM, 80mM, 20mM , relative to each milliliter of citric acid acid hydrolysis s...
Embodiment 3
[0054] This embodiment is used to illustrate the analysis method of the anion content in the solution containing citric acid provided by the present invention.
[0055] (1) Take 2 mL of citric acid acid solution, accurate to 0.01 mL, add 20 mL of high-purity water, and add 40% by weight potassium hydroxide aqueous solution dropwise at a rate of 20 drops / minute under stirring conditions, and use pH test paper while adding Measure the pH value, and when the pH value is 5.6, add high-purity water and adjust the pH value with 1% by weight of methyl hydroxide aqueous solution, set the volume to 100 mL and make the pH value reach 7.4 at the same time, shake well for later use.
[0056] (2) Use a syringe to take 2ml of the solution obtained in step (1), filter it with a 0.2um membrane, and inject it into the ion chromatograph, then pass it into the eluent KOH aqueous solution, and the concentration of the eluent is 15mM, 35mM, 70mM, 15mM , relative to each milliliter of citric acid a...
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