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Method for testing fluorine content in solution

A fluorine content and solution technology, which is applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as inaccurate measurement, and achieve accurate and reproducible measurement results. Sexual and environmental pollution-free effect

Inactive Publication Date: 2014-12-10
SHENYANG AIRCRAFT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluoride ion selective electrode method has limitations. It is more accurate for the measurement of fluorine content in aqueous solution with lower concentration, but it is not accurate for the measurement of fluorine content with higher concentration.

Method used

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  • Method for testing fluorine content in solution
  • Method for testing fluorine content in solution
  • Method for testing fluorine content in solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Take a 500mL Erlenmeyer flask, first add about 100mL of deionized water, then accurately pipette 1.0mL HF solution (known concentration is 45.0g / L) into the Erlenmeyer flask, shake well, add 2g of potassium nitrate, pipette accurately Put 75.00mL of lanthanum nitrate standard solution in a Erlenmeyer flask, adjust the pH value to 2.5, heat and boil for 2min, cool to room temperature, add 10mL of acetic acid-sodium acetate buffer solution, 5 drops of xylenol orange indicator, drop into the solution with EDTA standard solution From purple to bright yellow. Titrate in parallel three times, the amount of EDTA consumed is 61.9, 61.8., 62.0mL respectively, calculated to get F - The ion content is 45.4g / L.

Embodiment 2

[0067] Take a 500mL Erlenmeyer flask, first add about 100mL of deionized water, then accurately pipette 0.5mL of titanium milling solution containing HF concentration of about 47.0g / L, place it in the Erlenmeyer flask, shake well, add 2g of potassium nitrate, accurately Add 40.00mL of lanthanum nitrate standard solution to the Erlenmeyer flask, adjust the pH value to about 2.0 with 20g / L sodium hydroxide solution and 20% hydrochloric acid, add to boil for 2min, remove the water and cool to room temperature, add 10mL of acetic acid-sodium acetate buffer solution , 5 drops of xylenol orange indicator, drip with EDTA standard solution until the solution changes from purple red to bright yellow, which is the end point. The consumption of EDTA is 33.2, 33.5, 33.3mL respectively, and the F in the titanium milling solution is calculated. - The ion content is 47.4g / L.

Embodiment 3

[0069] Take a 500mL Erlenmeyer flask, first add about 100mL of deionized water, then accurately pipette 0.5mL of HF titanium milling solution with a concentration of 21.3g / L, place it in the Erlenmeyer flask, shake it well, add 2g of potassium nitrate, and accurately add 75.00 Put lanthanum nitrate standard solution in an Erlenmeyer flask, adjust the pH to about 2.0, heat and boil for 2 minutes, remove the water and cool to room temperature, add 10 mL of acetic acid-sodium acetate buffer solution, 5 drops of xylenol orange indicator, and drop to The solution turned from purple to bright yellow. Titrated in parallel three times, the amount of EDTA consumed was 84.8, 84.7, 84.5mL respectively, and the F in the titanium milling solution was calculated - The ion content is 21.0g / L.

[0070] Above embodiment does not limit the present invention, in actual operation, when preparing fluorine standard solution, lanthanum nitrate standard solution and EDTA standard solution at every t...

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Abstract

The invention relates to a method for testing fluorine content in a solution. The adopted the technical scheme comprises the following steps: adding deionized water into a conical flask, then accurately transferring a fluorine ion solution to be tested into the conical flask, shaking fully uniformly, adding potassium nitrate, accurately transferring a standard lanthanum nitrate solution into the conical flask, uniformly mixing, regulating the pH of the solution to be 1.0-3.0, heating and boiling for 1-2 minutes, and cooling to the room temperature; adding 10mL of acetate-sodium acetate buffered solution and five to six drops of xylenol orange indicator, and dripping into an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution until the solution turns bright yellow from prunosus. The method is simple and environment-friendly and can test the fluorine ion content in the fluoride solution of which the fluorine ion concentration is greater than 0.1mg / mL.

Description

technical field [0001] The invention relates to a method for determining the fluorine content in a solution, in particular to a method for determining the concentration of fluorine ions in the solution greater than 0.1 mg / mL. Background technique [0002] At present, the measurement methods of fluorine content in solution mainly include distillation-thorium nitrate volumetric method and fluoride ion selective electrode method. In the distillation-thorium nitrate volumetric method, thorium nitrate is radioactive, and the procurement is controlled, which is very harmful to operators and the environment. The fluoride ion selective electrode method has limitations. It is more accurate for the measurement of fluorine content in aqueous solution with lower concentration, but it is not accurate for the measurement of fluorine content with higher concentration. Contents of the invention [0003] The purpose of the present invention is to provide a method for measuring the fluorine...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 乔永莲杜宝瑞张敏沙春鹏
Owner SHENYANG AIRCRAFT CORP
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