Method for determining zinc content in zinc oxide by potentiometric titration
A potentiometric titration method and zinc oxide technology, applied in the direction of chemical analysis, chemical method analysis, and measuring devices by titration, to achieve complete dissolution, improve the accuracy of the results, and the results are accurate and sensitive
Inactive Publication Date: 2019-03-29
XINGJIA BIO ENG CO LTD
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Yet at present, the research about the determination of zinc content in zinc oxide by potentiometric titration has not yet been found, so it is of great significance to this field to provide a method for determining the content of zinc in zinc oxide by potentiometric titration
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[0040] A method for measuring zinc content in zinc oxide by potentiometric titration of the present invention comprises the following steps:
[0041] (1) Calibration: weigh m respectively 1 = 0.1502g, 0.1504g, 0.1497g, burn in a high-temperature furnace at 800±50°C to constant weight, place the working reference reagent zinc oxide (purity 99.95-100.05%) in a container, moisten it with a small amount of water, add 4mL 1+1 hydrochloric acid solution (concentrated hydrochloric acid with a mass concentration of 37% and deionized water at a volume ratio of 1:1) is heated and dissolved, then add 50mL of water, and use 1+1 ammonia solution (concentrated hydrochloric acid with a mass concentration of 23.5%) Ammonia water and deionized water are prepared at a volume ratio of 1:1) adjust the pH value of the solution to 7-8, add 10mL of ammonia-ammonium chloride buffer solution with pH ≈ 10, add 0.5mL saturated ammonium chloride solution and 1mol / L Tris Ethanolamine solution 0.5mL, then...
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The invention discloses a method for determining zinc content in zinc oxide by potentiometric titration, comprising the following steps of: wettening the zinc oxide of working reference reagent with water, adding the hydrochloric acid solution with water to adjust the pH, adding ammonia-ammonium chloride buffer solution, titrating the EDTA with an EDTA as a titration solution in an automatic potentiometric titrator, and recording the volume of the consumed EDTA after the titration, so as to calculate the concentration of the EDTA; and then weighing the zinc oxide sample with water, adding hydrochloric acid solution with water to adjust the pH, adding ammonia-ammonium chloride buffer solution, titrating the EDTA with an EDTA as a titration solution in an automatic potentiometric titrator, recording the volume of the consumed EDTA after the titration, and calculating the zinc content of zinc oxide. Compared with the traditional manual titration method in which the indicator mutation is not obvious and the end point is not easy to distinguish, the present invention adopts potentiometric titration, and judge by the instrument, therefore, the measurement results are more accurate and sensitive. Moreover, the required sample weight is small, the reagents consumed are small, and it is not necessary to add an indicator.
Description
technical field [0001] The invention relates to the technical field of detecting chemical components, in particular to a method for measuring zinc content in zinc oxide by potentiometric titration. Background technique [0002] Zinc oxide is widely used in feed additives, one as a zinc source supplement, and the other as a functional additive. Zinc oxide has anti-inflammatory, bactericidal, astringent, and anti-diarrheal effects. [0003] At present, the titration method of disodium oxalate tetraacetate (EDTA) is widely used in the determination of zinc content, and methyl orange or chrome black T is used as an indicator to indicate the color change of the end point, and manual titration is used. However, if the zinc oxide contains certain impurities, or the discoloration mutation is not obvious due to other factors, it will make it difficult to judge the end point. Moreover, manual titration is greatly affected by factors such as personnel experience, operating methods, h...
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CPCG01N31/164
Inventor 向阳葵钟芳邓敏周长虹黄逸强
Owner XINGJIA BIO ENG CO LTD