Determination method of zinc in gold alloy

A method of determination, a technique for gold alloys, used in chemical analysis by titration, measuring devices, measurement of color/spectral properties, etc.

Active Publication Date: 2016-12-07
SHENZHEN JINZHI GOLD&SILVER JEWELLERY INSPECTION RES CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are standard methods for the determination of gold, silver and copper in the current standards, but there is no method for the determination of zinc in gold alloys. Therefore, it is very important to invent a method suitable for production and accurate and reliable to measure the amount of zinc in gold alloys. great significance

Method used

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  • Determination method of zinc in gold alloy
  • Determination method of zinc in gold alloy
  • Determination method of zinc in gold alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Include the following steps:

[0056] (1) Weigh 0.5g sample, accurate to 0.0001g, place it in a 250mL beaker, add 8mL aqua regia, cover with a watch glass, heat at low temperature until the sample is completely dissolved, and evaporate to nearly dryness;

[0057](2) Add 4mL of hydrochloric acid, evaporate to near dryness, repeat 3 times, take it off, wash the watch glass and cup wall with water, add 1mL of sodium chloride solution, add water to 100mL, add dropwise 4mL of hydrazine hydrate solution under constant stirring, Heat and boil for 30 minutes to make the gold condense and precipitate, remove and cool to room temperature;

[0058] (3) Filter the test solution in a 400mL beaker with medium-speed quantitative filter paper, rinse the watch glass, beaker, filter paper and precipitation with water for 4 times, and the residue is used for recovery of gold;

[0059] (4) Place the filtrate on an electric stove and heat to evaporate to a volume of 15mL, add 4mL (1+1) sul...

Embodiment 2

[0067] Include the following steps:

[0068] (1) Weigh 0.8g sample, accurate to 0.0001g, place it in a 250mL beaker, add 10mL aqua regia, cover with a watch glass, heat at low temperature until the sample is completely dissolved, and evaporate to nearly dryness;

[0069] (2) Add 5mL of hydrochloric acid, then evaporate to nearly dryness, repeat 4 times, take it off, wash the watch glass and cup wall with water, add 1mL of sodium chloride solution, add water to 100mL, add dropwise 4mL of hydrazine hydrate solution under constant stirring, Heat and boil for 35 minutes to make the gold condense and precipitate, remove and cool to room temperature;

[0070] (3) Filter the test solution in a 400mL beaker with medium-speed quantitative filter paper, rinse the watch glass, beaker, filter paper and precipitation with water for 5 times, and the residue is used for recovery of gold;

[0071] (4) Place the filtrate on an electric stove and heat to evaporate to a volume of 20mL, add 5mL ...

Embodiment 3

[0079] Include the following steps:

[0080] (1) Weigh 1.0g sample, accurate to 0.0001g, put it in a 250mL beaker, add 12mL aqua regia, cover with a watch glass, heat at low temperature until the sample is completely dissolved, and evaporate to nearly dryness;

[0081] (2) Add 6mL of hydrochloric acid, then evaporate to near dryness, repeat 5 times, take it off, wash the watch glass and cup wall with water, add 1mL of sodium chloride solution, add water to 100mL, add dropwise 4mL of hydrazine hydrate solution under constant stirring, Heat and boil for 40 minutes to make the gold condense and precipitate, remove and cool to room temperature;

[0082] (3) Filter the test solution in a 400mL beaker with medium-speed quantitative filter paper, rinse the watch glass, beaker, filter paper and precipitation with water for 6 times, and the residue is used for recovery of gold;

[0083] (4) Place the filtrate on an electric stove and heat to evaporate to a volume of 25mL, add 6mL (1+1...

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Abstract

The invention relates to a determination method of zinc in gold alloy, and belongs to a determination method of amount of zinc in gold alloy. The method comprises the following steps: aqua regia is used for dissolving a sample material, hydrazine hydrate is used for deposition and separation gold, filtering is carried out, and filter residues are used for recycling gold; sodium hydroxide and a hydrogen peroxide solution are added into a filtrate for deposition and separation of nickel and copper, filtering is carried out, and an acetic acid-sodium acetate buffer solution is added into the filtrate; xylenol orange is used as an indicator, EDTA is used for titration till the color of the solution changes into luminous yellow from wine red, and the titration volume is used for calculating the content of zinc; hydrochloric acid is added into the filter residue for dissolving, volumetric flask is prepared, the amount of zinc is determined by an atomic absorption spectrometer at the wavelength of 213.8nm, and sum of the zinc contents which are determined by the two determination methods is the content of the zinc in the alloy. The method can be used for accurately determining the content of zinc in the gold alloy, and is suitable for analysis on a large scale, at the same time the method fills the blank of determination methods of zinc in gold alloy.

Description

technical field [0001] The invention relates to a method for determining zinc content in gold alloys, and is particularly suitable for batch determination of zinc content in gold alloys containing copper, nickel and zinc impurities. Background technique [0002] Through the analysis of national standard materials, standard samples, common nickel-containing K gold, and colored K gold, as well as through enterprise research and analysis, the analysis results of common gold alloys and impurity elements are as follows: Au: 35-99.994%; Ag: 0.203 ~35.01%; Cu: 0.207~60.4%; Zn: 0.30~17.5%; Ni: 0.522~17.1%. There are standard methods for the determination of gold, silver and copper in the current standards, but there is no method for the determination of zinc in gold alloys. Therefore, it is very important to invent a method suitable for production and accurate and reliable to measure the amount of zinc in gold alloys. great significance. Contents of the invention [0003] The in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/31
CPCG01N21/3103G01N31/16
Inventor 王菊张越郭嘉鹏关国军
Owner SHENZHEN JINZHI GOLD&SILVER JEWELLERY INSPECTION RES CENT CO LTD
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