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Method for measuring silicon dioxide content in solution

A silicon dioxide and determination method technology, applied in the field of chemical detection, can solve problems such as difficult storage, complicated preparation methods, inconvenient use, etc., and achieve the effect of eliminating interference

Inactive Publication Date: 2011-03-23
COMAC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method of reducing agent 1,2,4-aminonaphtholsulfonic acid is more complicated, inconvenient to use, and not easy to preserve

Method used

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  • Method for measuring silicon dioxide content in solution
  • Method for measuring silicon dioxide content in solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0062] This embodiment takes the determination of the silicon dioxide content in the chromic acid anodizing sealing solution as an example.

[0063] The chromic acid anodizing sealing solution is prepared with deionized water to prepare chromic acid with a nominal concentration of 26 g / 100 gallon (about 70 ppm) and 18 g / 100 gallon of sodium chromate or 26 g / 100 gallon of magnesium chromate solution Or a 22 g / 100 gal potassium chromate solution.

[0064] In general, for closed cells for chromic acid anodization, maintain the solution with the following parameters:

[0065] Hexavalent chromium 45~100ppm (based on Cr 6+ count)

[0066] PH3.2~3.8

[0067] Silicate 10ppm (maximum, as SiO 2 count)

[0068] Total Dissolved Solids (T.D.S) 250ppm (Max)

[0069] In order to ensure that the silicon dioxide content in the chromic acid anodizing solution is below 10 ppm, it is necessary to measure the silicon dioxide content in a colored solution such as the above-mentioned chromic a...

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Abstract

The invention discloses a method for measuring silicon dioxide content in solution. The method comprises the following steps of: preparing a series of standard solution of silicon dioxide with the concentration of below 5ppm in colorimetric tubes respectively; diluting the solution to a scale by using distilled water; adding sulfuric acid to regulate the pH of the solution to be measured to be 1.2; adding excessive solution of ammonium molybdate; shaking uniformly and standing for 20 to 30 minutes; adding excessive solution of oxalic acid; immediately adding excessive solution of ammonium ferrous sulfate; shaking uniformly and standing for 15 minutes; taking blank solution into which SiO2 is not added as reference solution, measuring the absorbance on a spectrophotometer and drawing a silicon dioxide standard curve; adding a proper amount of solution to be measured into a colorimetric tube; adding the sulfuric acid to regulate the pH to be 1.2; adding the excessive solution of ammonium molybdate; shaking and standing for 20 to 30 minutes; adding the excessive solution of oxalic acid, and immediately adding the excessive solution of ammonium ferrous sulfate; shaking uniformly and standing for 15 minutes; taking the same blank solution as the reference solution and measuring the absorbance on the spectrophotometer; and calculating the silicon dioxide content in the solution according to the drawn silicon dioxide standard curve and the measured absorbance of the solution to be measured.

Description

technical field [0001] The invention relates to a chemical detection method, in particular to a method for measuring the silicon dioxide content in a colored sample solution (such as chromic acid anodized sealing solution) with low silicon dioxide content. Background technique [0002] The aluminum alloy materials used to make aircraft need to be anodized before painting. During the anodizing process of aluminum alloy, if there is silicon dioxide in the anodized chromic acid solution, the adhesion of the anodized aluminum alloy plate will be reduced in the subsequent painting process. In the production process, the content of silica must be strictly controlled. The bath liquid involved in each operation process of the whole production process, including the deionized water for preparing the bath liquid, needs to measure the content of silica. [0003] Commonly used SiO 2 There are many kinds of analysis methods, including gravimetric method, volumetric method, colorimetri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 吴红儿
Owner COMAC
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