Method for detecting cyanide content in electroformed gold product by headspace gas chromatography

A headspace gas chromatography and cyanide technology, applied to the determination of cyanide content in electroformed gold products, using headspace gas chromatography to detect cyanide content in electroformed gold products, can solve the problem of cyanide Problems such as high risk, disrupting market order, and lack of cyanide detection methods have achieved the effect of increasing the detection amount and promoting healthy long-term development

Active Publication Date: 2020-06-09
NANJING INST OF PROD QUALITY INSPECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different processing enterprises have their own unique production processes and formulas. At present, more than 70% of the production enterprises in the market still use cyanide as the raw material for preparing electrolyte. The risk of cyanide in the product is high, and there is no relevant product standard to restrict it
At present, the testing of this kind of products mainly refers to the standard of traditional gold products, and its key safety and health indicators are not reflected, which leads to confusion in the new electroforming process gold jewelry market
The most important thing is that the production technology of electroforming gold products is mainly based on cyanide electrolyte. As a highly toxic substance, cyanide has clear limits and is strictly controlled in other related products. However, due to the lack of corresponding detection methods for such products, As a result, all such products currently on the market are clearly declared as cyanide-free products, and the relevant product standard business limit requirements have seriously disrupted the normal market order, and consumers cannot obtain real information about the products.
[0004] Data retrieval found that there is no relevant cyanide detection method for this type of product, and the detection of cyanide in other products, food, and wastewater can be determined through simple sample processing

Method used

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  • Method for detecting cyanide content in electroformed gold product by headspace gas chromatography
  • Method for detecting cyanide content in electroformed gold product by headspace gas chromatography
  • Method for detecting cyanide content in electroformed gold product by headspace gas chromatography

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0061] Influence of different dissolving reagents of example 1 on the detection of cyanide content in electroformed gold products

[0062] Select 6 kinds of electroforming process gold product samples, two of which are cyanide-free electroforming process (No. 1#, 2#), and 4 kinds are cyanide electroforming process (3#, 4#, 5#, 6#) . Analytical pure solution of hydrogen peroxide refers to commercially available 30wt% hydrogen peroxide solution. Due to the standard electrode potential of the gold element is 1.498V, It is 1.692V, which shows that the ion oxidation of gold is extremely strong, on the contrary, it shows that gold atoms are extremely weak and difficult to be oxidized; therefore, this method needs to first select a suitable reagent to reduce its redox potential and improve the reducibility of gold atoms. Chlorine The presence and increased concentration of ions can effectively reduce their oxidation, such as: The standard electrode potential is 1.002V, and the...

example 2

[0067] Influence of Example 2 Different Extraction Reagents on the Detection of Cyanide Content in Electroformed Gold Products

[0068] Adopt six samples selected in Example 1 to carry out the cyanide separation and extraction experiment, take by weighing 0.2g sample pulverization, dissolve sample (1-SJ-8#) successively according to step one optimal condition, obtain sample aqueous solution.

[0069] Transfer the sample aqueous solution to a round bottom flask, add 6 different extraction reagents, 3-SJ-1#: 15mL hydrochloric acid; 3-SJ-2#: 15mL phosphoric acid; 3-SJ-3#: 15g trichloroacetic acid; 3-SJ-4#: 15g tartaric acid; 3-SJ-5#: 15mL hydrochloric acid, 15g disodium edetate; 3-SJ-6#: 2g trichloroacetic acid, 15g disodium edetate; 3-SJ-7#: tartaric acid 8g, edetate disodium 15g; 3-SJ-8#: trichloroacetic acid 2g, tartaric acid 8g, edetate disodium 15g, reflux at 100°C respectively , under airtight conditions, distilled fraction is absorbed with 40mL 30g / L sodium hydroxide aque...

example 3

[0074] Adopt six samples selected in Example 1 to carry out research experiment, take 0.2g sample and pulverize, dissolve sample successively according to step 1 and step 2 optimal conditions (1-SJ-8# and 2-SJ-8#), separate Cyanide was extracted to obtain a cyanide absorption solution, the volume of the separated cyanide absorption solution was adjusted to 50 mL, and 10 mL was added to different headspace chromatography headspace solutions.

[0075] To investigate the influence of different headspace gas chromatography headspace solutions on the detection of cyanide content in electroformed gold products:

[0076] Different headspace chromatographic headspace solutions are as follows, 3-SHY-1#: 40 μL of analytically pure phosphoric acid; 3-SHY-2#: 0.1 mL of 20 g / L chloramine T solution; 3-SHY-3#: 20μL phosphoric acid analytical grade and 0.1mL 20g / L chloramine T solution; 3-SHY-4#: 40μL phosphoric acid analytical grade and 0.05mL 20g / L chloramine T solution; 3-SHY-5#: 80μL phosp...

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Abstract

The invention belongs to the technical field of gold product detection and particularly discloses a method for determining the cyanide content in an electroformed gold product by gas chromatography. The method comprises steps of 1) weighing the electroformed gold product as a test sample, and dissolving the test sample by using mixed reagent of hydrogen peroxide, sodium chloride and oxalic acid; 2) distilling out hydrogen cyanide through disodium ethylene diamine tetraacetate, tartaric acid and trichloroacetic acid under a boiling condition, and absorbing with sodium hydroxide solution to obtain cyanide aqueous solution for detection; and 3) adding 10mL of the sample into a headspace sample injection bottle containing phosphoric acid and chloramine T, determining the concentration of cyanide by headspace gas chromatography, and calculating the content of cyanide in the to-be-determined solution by calibrating a working curve. The method is advantaged in that the method can be used foraccurately measuring the content of cyanide in the electroformed gold product, fills up the technical blank that the cyanide in the product cannot be measured, and is convenient and quick in detectionprocess, accurate in detection result and good in consistency.

Description

technical field [0001] The invention belongs to the technical field of gold product detection, and in particular relates to a method for measuring the content of cyanide (calculated as cyanide ions) in gold products of electroforming technology, especially the method for measuring the content of cyanide in gold products of electroforming technology by using headspace gas chromatography technology. method of detection. Background technique [0002] With the development of society and economy, people's demand for precious metal jewelry consumption continues to increase. Traditional gold jewelry is soft and easy to deform when worn. Production and processing usually increase the hardness of the product by increasing the thickness, but it is very heavy to wear. The current mainstream consumer demand for precious metal jewelry is to be able to take into account both beauty and comfort. In recent years, a kind of gold product—electroforming gold product has emerged as the times r...

Claims

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Application Information

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IPC IPC(8): G01N30/96
CPCG01N30/96Y02P10/20
Inventor 金绪广黄成王鑫磊王亮张帆黄杏娇王金砖黄文清周骏贵伏荣进杨桂群白志辉张翼曹小勇张爽蔡薇李倍
Owner NANJING INST OF PROD QUALITY INSPECTION
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