Method for determining content of lead in silver alloy

A silver alloy and titration technology, which is applied in the field of analytical chemistry, can solve the problems of no suitable silver alloy determination method, and achieve the effects of wide determination range, accurate determination and simple method

Inactive Publication Date: 2018-09-28
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for determining the amount of lead in silver alloys to solve the

Method used

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  • Method for determining content of lead in silver alloy
  • Method for determining content of lead in silver alloy
  • Method for determining content of lead in silver alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Include the following steps:

[0038] Step 1. Weigh 0.3000g sample and put it into a 400mL beaker, record it as m, then add 10mL concentrated nitric acid, cover the watch glass, and heat it on an electric hob at 150°C. After the sample dissolves, take it out and cool it to room temperature;

[0039] Step 2: Add 10mL of sulfuric acid to the above beaker, heat to smoke for 2min, remove and cool to room temperature, rinse the surface and the beaker wall with deionized water, add deionized water to 80mL, heat to boil for 10min, remove, Cool to room temperature, add 5mL ethanol, and let stand for 1 hour;

[0040] Step 3, filter with slow quantitative filter paper, wash the beaker 3 times with sulfuric acid lotion with a concentration of (2+98), wash the precipitate 6 times, check the filtrate with a potassium thiocyanate solution with a concentration of 50g / L until no red appears Wash the beaker and precipitate twice with deionized water, and discard the filtrate;

[0041]...

Embodiment 2

[0073] Step 1. Weigh 0.3000g sample and put it into a 400mL beaker, record it as m, then add 15mL concentrated nitric acid, cover the watch glass, and heat it on an electric stove at 180°C. After the sample dissolves, take it out and cool it to room temperature;

[0074] Step 2: Add 12mL of sulfuric acid to the above beaker, heat it to smoke for 3min, remove it and cool it to room temperature, rinse the surface and the wall of the beaker with deionized water, add deionized water to 90mL, heat and boil for 12min, remove it, Cool to room temperature, add 8mL ethanol, and let stand for 1.5 hours;

[0075] Step 3, filter with slow quantitative filter paper, wash the beaker 4 times with sulfuric acid lotion with a concentration of (2+98), wash the precipitate 7 times, check the filtrate with a potassium thiocyanate solution with a concentration of 50g / L until no red appears Wash the beaker and precipitate twice with deionized water, and discard the filtrate;

[0076] Step 4. Put t...

Embodiment 3

[0108] A method for measuring lead content in silver alloys, the concrete steps are as follows:

[0109] Step 1. Weigh 0.3000g sample and put it into a 400mL beaker, record it as m, then add 20mL concentrated nitric acid, cover the watch glass, and heat it on an electric stove at 200°C. After the sample dissolves, take it out and cool it to room temperature;

[0110] Step 2: Add 15mL of sulfuric acid to the above beaker, heat it to smoke for 5min, remove it and cool it to room temperature, rinse the surface and the wall of the beaker with deionized water, add deionized water to 100mL, heat and boil for 15min, remove it, Cool to room temperature, add 10mL ethanol, and let stand for 2 hours;

[0111] Step 3, filter with slow quantitative filter paper, wash the beaker 5 times with sulfuric acid lotion with a concentration of (2+98), wash the precipitate 8 times, check the filtrate with a potassium thiocyanate solution with a concentration of 50g / L until no red appears Wash the b...

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Abstract

The invention relates to a method for determining the content of lead in a silver alloy and belongs to the technical field of analytical chemistry. The method comprises dissolving a sample through nitric acid, adding sulfuric acid into the solution so that the lead forms lead sulfate precipitates and is separated, and carrying out titration in an acetic acid-sodium acetate buffer solution to meteron the lead content of the alloy through EDTA. The method is simple and rapid, has a wide measuring range, realizes accurate measurement, compensates for the blank of high-content lead analysis in the silver alloy, provides the technical support for analysis and determination of silver products in the precious metal field, is suitable for testing and analysis of large-volume samples, and can be widely applied in the ore test and analysis field.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for measuring lead content in silver alloys. The method is suitable for the lead content in silver alloys of 5.00% to 40.00%. Background technique [0002] Silver alloy is an alloy composed of silver and other metal products. Usually, silver alloy is accompanied by elements such as copper, lead, and zinc, and occupies an important position in precious metal materials. Therefore, the accurate determination of copper, lead, zinc and other elements in silver alloys not only affects the transaction price of silver alloys, but also is very important to the development of this industry. The lead content in pure silver is low, usually less than 1%, which is determined by flame atomic absorption spectrometry, while the high content of lead in silver alloys can reach 30% to 40%; by atomic absorption spectrometry and inductively coupled plasma French nati...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 苏广东洪博刘正红高振广
Owner CHANGCHUN GOLD RES INST
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