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Method for determining content of bismuth element in silver ornament

A technology for element content and silver jewelry, which is applied in the preparation of test samples, measuring devices, and material analysis through electromagnetic means, can solve the problem of difficult to obtain accurate detection results for silver content in silver jewelry, excessive bismuth content in silver jewelry, and difficult Accurate detection and other problems, to achieve high recovery, eliminate adsorption, and good stability

Inactive Publication Date: 2021-08-03
SHANDONG MEASUREMENT SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption of bismuth by silver chloride precipitation was studied through standard addition recovery experiments, and it was found that silver chloride precipitation had a strong adsorption effect on bismuth, resulting in low recovery and instability, making it difficult to accurately detect
However, there are relatively few research materials on the detection of bismuth in the prior art, and bismuth, as a recognized "green" element, is widely used in fusible alloys and metallurgical additives. It is artificially added. In some serious cases, the bismuth content in silver jewelry is seriously exceeded, and it is difficult to obtain accurate detection results for the silver content in silver jewelry.

Method used

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  • Method for determining content of bismuth element in silver ornament
  • Method for determining content of bismuth element in silver ornament
  • Method for determining content of bismuth element in silver ornament

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: hydrochloric acid direct precipitation, silver chloride is to bismuth element adsorption experiment

[0031] Prepare a mixed standard solution with a bismuth content of 50 μg / mL, then use the mixed standard solution of bismuth to prepare a series of mixed standard solutions of bismuth with a concentration of 0, 1.0, 2.0, 3.0, 5.0, 10.0 μg / mL, and measure on the machine. Select the appropriate curve equation to establish the working curve.

[0032] Use nitric acid and high-purity silver (silver content higher than 99.99wt%) to prepare 50μg / mL silver-containing matrix solution, then measure 10.00mL of 50μg / mL silver-containing matrix solution and place it in a 50mL beaker, add 1.00, 5.00, 10.00mL respectively Bismuth element mixed series standard solution, add 15mL concentrated nitric acid, slowly heat to drive out nitrogen oxides. Then slowly drop 2mL of 37wt% hydrochloric acid solution, after standing still for 1h, the silver nitrate is completely precipi...

Embodiment 2

[0037] Embodiment 2: first add CyDTA, then add hydrochloric acid, silver chloride is to bismuth element adsorption experiment

[0038] Prepare a mixed standard solution with a bismuth content of 50 μg / mL, then use the mixed standard solution of bismuth to prepare a series of mixed standard solutions of bismuth with a concentration of 0, 1.0, 2.0, 3.0, 5.0, 10.0 μg / mL, and measure on the machine. Select the appropriate curve equation to establish the working curve.

[0039] Use nitric acid and high-purity silver (silver content higher than 99.99wt%) to prepare 50μg / mL silver-containing matrix solution, then measure 10.00mL of 50μg / mL silver-containing matrix solution and place it in a 50mL beaker, add 1.00, 5.00, 10.00mL respectively After adding 15mL of concentrated nitric acid to the standard solution of the mixed series of two elements, slowly heat to drive away the nitrogen oxides. Then slowly add 0.50, 2.50 and 5.00mL CyDTA solution, slowly drop into 2mL37wt% hydrochloric...

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Abstract

The invention relates to a method for determining the content of bismuth in a silver ornament, and belongs to the field of element content analysis. The method for determining the content of bismuth in the silver ornament comprises the steps of firstly, weighing a certain mass of to-be-detected silver ornament, and dissolving the to-be-detected silver ornament with nitric acid to obtain a silver nitrate solution; then adding a CyDTA solution into the obtained silver nitrate solution, and then adding hydrochloric acid to fully precipitate silver ions into silver chloride; and finally filtering out the silver chloride precipitate, and measuring the content of bismuth in the filtrate. The method can effectively eliminate the adsorption of silver chloride to the bismuth element and improve the detection accuracy of the bismuth element in the silver ornament. When the method is used for measuring bismuth-containing samples with the concentrations of 1 mu g / mL, 5 mu g / mL and 10 mu g / mL, the adding standard recovery rate is 85-97%, the recovery rate is high, and the stability is good. According to the technical scheme, CyDTA is added as a complexing agent, the problem that due to the fact that bismuth is adsorbed by silver chloride, accurate detection cannot be achieved through a traditional method can be well solved, and accurate determination of the content of all elements of the silver ornament is achieved.

Description

technical field [0001] The invention relates to a detection method for impurity elements in silver ornaments, in particular to a method for determining the bismuth element content in silver ornaments. Background technique [0002] As a common precious metal, silver plays an important role in the jewelry industry. However, there are many types of impurity elements in silver jewelry, especially pure silver jewelry produced by simple smelting. The common ones are copper, zinc, chromium, lead, cadmium, nickel, cobalt, tin, antimony, etc. For the determination of these impurity elements, the subtraction method or direct method is generally used in the prior art to determine the impurity content in silver jewelry: [0003] Direct method: According to the national standard GB / T 38162, the silver matrix matching method is used to test the content of impurity elements, and the silver content is obtained by the subtraction method. The test solution contains a high content of silver ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/626G01N1/28G01N1/34G01N1/38
CPCG01N27/626G01N1/28G01N1/34G01N1/38
Inventor 刘雪松李桂华刘海彬李建军王萍朱红伟王岳祝培明闫宁孙永军
Owner SHANDONG MEASUREMENT SCI RES INST
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