Method for measuring magnesium and zinc content in alloy at same time and application thereof

A technology of zinc content and alloy, which is applied in chemical analysis by titration method, analysis by causing chemical reaction of materials, material analysis by observing the influence of chemical indicators, etc. It can solve the problem of long analysis time and potential titration of zinc. End point delay, measurement inconvenience and other problems, to achieve the effect of simple and fast method, shorten the measurement time

Inactive Publication Date: 2016-08-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned potentiometric titration method itself has defects, and the end point of the potentiometric titration of zinc is prone to delay, resulting in inaccurate results; at the same time, a displacer is added in the titration process, more reagents are added, and the required analysis time is also longer
In addition, in the prior art, when the content of magnesium and zinc in the sample of magnesium-zinc alloy is determined by titration, generally the two cannot be titrated in the same pH range, and the pH needs to be adjusted in the middle of the titration. bring inconvenience
[0005] The content of magnesium and zinc in the magnesium-zinc alloy can also be measured by methods such as atomic absorption spectrometry, atomic emission spectrometry and inductively coupled plasma spectrometry, but these assay methods all need to purchase expensive instruments and equipment; meanwhile, the above assay methods Suitable for trace analysis, when it is applied to constant analysis, the analysis error is large

Method used

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  • Method for measuring magnesium and zinc content in alloy at same time and application thereof
  • Method for measuring magnesium and zinc content in alloy at same time and application thereof
  • Method for measuring magnesium and zinc content in alloy at same time and application thereof

Examples

Experimental program
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Embodiment 1

[0023] In step one, weigh 0.9114g of a bright and clean alloy, which only contains magnesium and zinc, that is to say, the alloy is a magnesium-zinc alloy with a purity of 100%; add 6mol / L hydrochloric acid dropwise to the alloy The aqueous solution, after it is completely dissolved, is heated and stirred until slightly boiling to obtain the first solution; the first solution is transferred to a 200.00mL volumetric flask, diluted with deionized water, fixed to volume, and shaken to obtain an aqueous solution of magnesium and zinc ions. Preferably, for the accuracy of subsequent titration endpoint judgment, the concentration of the prepared magnesium and zinc ion aqueous solution is preferably 0.14 mol / L-0.2 mol / L.

[0024] In this step, the purpose of heating and stirring until slightly boiling is to remove the excess hydrochloric acid aqueous solution used when dissolving the alloy, so as to reduce the acidity of the first solution.

[0025] In step 2, accurately pipette 2.00...

Embodiment 2

[0036]In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the similarities with Embodiment 1 will be described. The difference between embodiment 2 and embodiment 1 is that in step one, the quality of the alloy is 1.1025g; in step two, the volume of the titration sample is 5.00mL; The dosage concentration is 0.05096mol / L, and the volume dosage of the EDTA-2Na aqueous solution is 18.57mL; in step 4, the calculated mass percentages of magnesium and zinc in the alloy are 73.64% and 26.36%, respectively.

Embodiment 3

[0038] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is that in step one, the quality of the alloy is 0.9879g; in step two, the volume of the titrated sample is 10.00mL; The dosage concentration is 0.1011mol / L, and the volume dosage of the EDTA-2Na aqueous solution is 14.60mL; in step 4, the calculated mass percentages of magnesium and zinc in the alloy are 56.43% and 43.57%, respectively.

[0039] It is worth noting that, because the alloys in the above-mentioned Examples 1-3 are all magnesium-zinc alloys with a purity of not less than 99.9%, it can be approximately considered that the purity of the alloy reaches 100%. Therefore, the quality of the alloys in the above-mentioned Examples 1-3 It is equal to the total mass of magnesium and zinc in the alloy. Certainly, the method for simultaneously measuring magne...

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Abstract

The invention discloses a method for measuring the magnesium and zinc content in alloy at the same time. The method comprises the steps that A, acid is used for dissolving the alloy to obtain a first solution; B, the first solution is prepared into a magnesium and zinc ion water solution; C, the magnesium and zinc ion water solution is taken to serve as a titration sample, an NH4Cl-NH3.H2O buffering solution and an eriochrome black T indicator are sequentially added into the titration sample, the pH of the titration sample is kept to be 9-11, and the titration sample is shaken up uniformly to obtain a titration solution; D, an EDTA-2Na water solution is adopted for titraging the titration solution, titraging is stopped until the titration solution is turned into azure from wine red, and the volume use amount of the EDTA-2Na water solution is recorded; E, the mass percent of magnesium and zinc in the alloy is calculated. The method is fast and simple, and the measuring time is short.

Description

technical field [0001] The invention belongs to the technical field of alloy composition analysis, and in particular relates to a method for simultaneously measuring magnesium and zinc contents in alloys and an application thereof. Background technique [0002] Pure magnesium cannot be used as a structural material and must be modified by alloying and process optimization. As one of the two main alloying elements of magnesium alloys, zinc has a significant strengthening effect on magnesium alloys. The main effects of Zn on magnesium alloys are as follows: (1) Zn can dissolve in magnesium alloys and play a solid solution strengthening effect on magnesium alloys. The addition of Zn can also increase the solid solubility of other elements in magnesium alloys at the same time, thereby improving Solid solution strengthening of other elements; (2) Zn forms high-melting point compounds with other elements in magnesium alloys, which can improve the high-temperature mechanical prope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/78
CPCG01N31/16G01N21/78
Inventor 李明珍胡耀强王世栋叶秀深李权吴志坚
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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