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Method for titration of zinc content in silver-copper-zinc alloy by ethylenediamine tetraacetic acid

A technology of ethylenediaminetetraacetic acid and silver-copper-zinc, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problem of time-consuming, reagent and glassware consumption Many problems, to achieve the effect of easy operation, improve accuracy, and reduce operation steps

Inactive Publication Date: 2014-07-09
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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Problems solved by technology

[0002] With the development of analysis and testing technology at home and abroad, various testing companies have correspondingly improved the analysis and testing level of their products in order to adapt to the fierce market competition. At present, the analysis method of zinc content in copper alloys in my country is in accordance with the national standard GB / T5121.11-2008 Carried out, the analysis method is 4-methyl-pentanone-2 extraction and separation-Na 2 EDTA titration method, the sample analysis process is complex and requires extraction, which takes a long time, consumes more reagents and glassware, and this method is only suitable for the determination of zinc content in the range of 2.00% to 6.00%.

Method used

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  • Method for titration of zinc content in silver-copper-zinc alloy by ethylenediamine tetraacetic acid
  • Method for titration of zinc content in silver-copper-zinc alloy by ethylenediamine tetraacetic acid
  • Method for titration of zinc content in silver-copper-zinc alloy by ethylenediamine tetraacetic acid

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Embodiment 1

[0034] Embodiment 1: the mensuration of zinc content in silver-copper-zinc alloy

[0035] (1) Reagent solution and configuration

[0036] 1) Thiourea solution 0.1g / mL;

[0037] 2) xylenol orange indicator 0.25% by weight;

[0038] 3) Hexamethylenetetramine solution 0.1g / mL;

[0039] 4) Standard solution of ethylenediaminetetraacetic acid (EDTA): 0.020mol / L Weigh 7.5g of ethylenediaminetetraacetic acid (EDTA) and dissolve in 1L of water, boil and cool;

[0040] 5) nitric acid solution (concentrated nitric acid and water with a concentration of 67wt% are prepared according to the volume ratio of 1:1)

[0041] 6) bromocresol green indicator 0.1% by weight, prepared with 17% by volume ethanol

[0042] 7) Zinc standard solution 2.00mg / mL, the preparation method is as follows:

[0043] Accurately weigh 0.2000g of high-purity zinc with a zinc content of more than 99.99% in a 150mL beaker, add 10mL of nitric acid solution, cover a watch glass, heat to dissolve at about 200°C, coo...

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Abstract

The invention relates to a method for titration of the zinc content in a silver-copper-zinc alloy by ethylenediamine tetraacetic acid (EDTA). The method includes: weighing a unit sample in a beaker, dissolving the sample in nitric acid, taking part of the sample solution into a triangular flask, and adding a thiourea solution to mask the interference of silver copper; adding a bromocresol green indicator, a hexamethylene tetramine solution and water to adjust the pH to about 5.0, adding a xylenol orange indicator, and using an ethylenediamine tetraacetic acid (EDTA) standard solution to perform titration till the solution just changes from purple to grass green, recording the milliliter number of the consumed standard solution, and calculating the percent content results of each to-be-measured element according to a calculation formula. The method provided by the invention simplifies operation steps, shortens the testing time, reduces the interference of other elements on the sample, improves the accuracy of the test result, and is convenient for operation.

Description

technical field [0001] The invention relates to volumetric analysis and testing technology, in particular to an analysis method for determining the zinc content in silver-copper-zinc alloys of 13% to 45% by using ethylenediaminetetraacetic acid (EDTA) titration method. Background technique [0002] With the development of analysis and testing technology at home and abroad, various testing companies have correspondingly improved the analysis and testing level of their products in order to adapt to the fierce market competition. At present, the analysis method of zinc content in copper alloys in my country is in accordance with the national standard GB / T5121.11-2008 Carried out, the analysis method is 4-methyl-pentanone-2 extraction and separation-Na 2 EDTA titration method, the sample analysis process is complex and requires extraction, which takes a long time, consumes more reagents and glassware, and this method is only suitable for the determination of zinc content in the r...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 闫雅坤郅富国姚芳许海燕郭飞
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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