Method for detecting copper content in brass through iodometry

A technology of copper content and iodometric method, which is applied in chemical method analysis, preparation of test samples, measuring devices, etc., can solve the problems of time-consuming copper content measurement, inappropriate batch rapid detection in production process, etc., and achieve accurate measurement results. Reliable, accurate in measuring reaction rate and results, and the effect of eliminating the influence of impurity elements

Inactive Publication Date: 2017-05-31
武汉泛洲中越合金有限公司
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method of shortening the detection period while ensuring the accuracy of the detection results, which is used to sol...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for detecting copper content in brass through iodometry
  • Method for detecting copper content in brass through iodometry
  • Method for detecting copper content in brass through iodometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Solution preparation:

[0055] Nitric acid solution: mix concentrated nitric acid and water with a volume ratio of 1:1;

[0056] Glacial acetic acid solution: mix glacial acetic acid and water with a volume ratio of 1:4;

[0057] Sodium thiosulfate standard titration solution (O.10mol / L): Weigh 250g of sodium thiosulfate pentahydrate and place it in a 1000mL beaker to dissolve it with deionized water, add 20g of anhydrous sodium carbonate, and transfer it to the brown reagent bottle. Dilute the freshly boiled and cooled distilled water to about 10L, shake well, and let it stand for more than 10 days; the newly boiled and cooled distilled water can remove carbon dioxide in the water and kill microorganisms, and add anhydrous sodium carbonate to make the solution weakly alkaline, which can prevent The sodium thiosulfate standard titration solution is acidic to decompose and remove the copper ions that may be contained in the water, and under this condition, the microbial activi...

Embodiment 2

[0098] Solution preparation:

[0099] Nitric acid solution: mix concentrated nitric acid and water with a volume ratio of 1:2;

[0100] Glacial acetic acid solution: mix glacial acetic acid and water with a volume ratio of 1:4;

[0101] Sodium thiosulfate standard titration solution (0.05mol / L): Weigh 125g of sodium thiosulfate pentahydrate and dissolve it in a 1000mL beaker, add 10g of anhydrous sodium carbonate, transfer it to a brown reagent bottle, and use freshly boiled and cooled distilled water Dilute to about 10L, shake well, and let stand for more than 10 days;

[0102] Potassium iodide solution (100g / L): Weigh 10g of potassium iodide, place it in a 400mL beaker, add 50mL of freshly boiled and cooled distilled water and stir until it is completely dissolved, dilute to 100mL with freshly boiled and cooled distilled water, and shake well;

[0103] Starch solution (3g / L): Weigh 3g of soluble starch, slowly add it to 1L of distilled water, stir evenly, and boil until the solution ...

Embodiment 3

[0131] Solution preparation:

[0132] Nitric acid solution: a mixture of concentrated nitric acid and water with a volume ratio of 2:3;

[0133] Glacial acetic acid solution: mix glacial acetic acid and water with a volume ratio of 1:4;

[0134] Sodium thiosulfate standard titration solution (0.15mol / L): Weigh 375g sodium thiosulfate pentahydrate and dissolve it in a 1000mL beaker, add 30g anhydrous sodium carbonate, transfer it to a brown reagent bottle, and use freshly boiled and cooled distilled water Dilute to about 10L, shake well, and let stand for more than 10 days;

[0135] Potassium iodide solution (100g / L): Weigh 10g of potassium iodide, place it in a 400mL beaker, add 50mL of freshly boiled and cooled distilled water and stir until it is completely dissolved, dilute to 100mL with freshly boiled and cooled distilled water, and shake well;

[0136] Starch solution (8g / L): Weigh 8g of soluble starch, slowly add it to 1L of distilled water, stir evenly, and boil until the soluti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for detecting copper content in brass through iodometry. The method for detecting the content of copper in brass through iodometry comprises the following steps: 1, weighing a brass sample of a certain mass, adding a nitric acid solution so that the brass sample is completely dissolved, and diluting with deionized water so as to obtain a diluted solution; 2, dripping ammonia water into the diluted solution, dripping until a blue copper hydroxide precipitate appears, and adding glacial acetic acid so as to obtain a brass sample solution; 3, adding a potassium iodide solution into the brass sample solution in the step 2, immediately titrating with a sodium thiosulfate standard titration solution until the solution is light yellow, adding a starch solution, continuously titrating until the solution is light blue, adding a potassium thiocyanate solution, and titrating until the light blue color disappears; and 4, calculating the copper content in the brass sample. According to the method disclosed by the invention, the content of copper in the brass is detected through the iodometry, the detection time can be reduced, the detection period is greatly shortened, and the method is applicable to batch and rapid detection in the enterprise production process.

Description

Technical field [0001] The invention relates to the technical field of detection and analysis of the content of heavy metal elements, in particular to a method for detecting the content of copper in brass by an iodometric method. Background technique [0002] According to the national industry standard copper and copper alloy chemical analysis method (standard number: GB / T5121.1-2008), the determination of copper content is mainly electrolysis, such as electrolysis-atomic absorption spectrometry, potassium permanganate oxidation tellurium-electrolysis -Atomic absorption spectroscopy and electrolysis-spectrophotometry. [0003] Electrolysis-atomic absorption spectrometry is to dissolve the sample with nitric acid and hydrofluoric acid, reduce nitrogen oxides with hydrogen peroxide, add lead to reduce the loss of platinum on the anode, electrolysis causes copper to precipitate on the platinum cathode, and the cathode is dried After weighing, the amount of copper remaining in the ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N21/79G01N1/38G01N1/44G01N31/16
CPCG01N21/79G01N1/38G01N1/44G01N31/162
Inventor 唐小红林培
Owner 武汉泛洲中越合金有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap