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Determination method of platinum content in a kind of platinum-palladium alloy jewelry

A technology of platinum-palladium alloy and determination method, which is applied in the detection field, can solve problems such as long analysis period, large equipment investment, and accumulated errors, and achieve the effects of shortening the analysis period, good reliability, and improving analysis efficiency

Active Publication Date: 2021-02-19
SHANGHAI LAO FENGXIANG JEWELRY RES INSTCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual operation, there are shortcomings such as long analysis period, large investment in equipment, and easy accumulation of errors.

Method used

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  • Determination method of platinum content in a kind of platinum-palladium alloy jewelry
  • Determination method of platinum content in a kind of platinum-palladium alloy jewelry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Sample pretreatment: After cutting the platinum-palladium alloy sample (Pt950Pd50, platinum mass fraction 950‰) into thin slices with a thickness of 0.2mm, cut it into an area 2 Get the platinum-palladium alloy sample piece after the small piece, stand-by;

[0029](2) Weighing and dissolving: in a fume hood, weigh 0.3g of platinum-palladium alloy sample piece, and record it as m, add in the Erlenmeyer flask, add 5ml of hydrochloric acid with a mass fraction of 0.36% and 1ml of nitric acid with a mass fraction of 0.65% , the Erlenmeyer flask is placed on a natural gas stove to heat, during the heating period, repeatedly add 5ml of 0.36% mass fraction of hydrochloric acid and 1ml of 0.65% of mass fraction of nitric acid to the Erlenmeyer flask until the platinum-palladium alloy sample block is completely dissolved;

[0030] (3) Degradation of nitric acid: continue heating the Erlenmeyer flask to decompose the remaining nitric acid by heat. When the solution is nearly d...

Embodiment 2

[0051] (1) Sample pretreatment: After cutting the platinum-palladium alloy sample (Pt900Pd100, platinum mass fraction 900‰) into thin slices with a thickness of 0.2mm, cut it into an area 2 Get the platinum-palladium alloy sample piece after the small piece, stand-by;

[0052] (2) Dissolving by weighing: in a fume hood, weigh 0.3g of the platinum-palladium alloy sample block, and record it as m, add it to the conical flask, add 5ml of hydrochloric acid with a mass fraction of 0.38% and 1ml of nitric acid with a mass fraction of 0.68% , the Erlenmeyer flask is placed on a natural gas stove to heat, during the heating period, repeatedly add 5ml of 0.38% mass fraction of hydrochloric acid and 1ml of 0.68% of mass fraction of nitric acid to the Erlenmeyer flask until the platinum-palladium alloy sample block is completely dissolved;

[0053] (3) Degradation of nitric acid: continue heating the Erlenmeyer flask to decompose the remaining nitric acid by heat. When the solution is nea...

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Abstract

The invention discloses a method for determining the content of platinum in platinum-palladium alloy jewelry. The method comprises the following steps: (1) sample pretreatment; (2) weighing and dissolving of a sample; (3) degradation of nitric acid; (4) dissolving of complex acid; (5) oxidative hydrolysis; (6) crude separation of platinum palladium components; (7) dissolving of a palladium precipitate hydrate; (8) oxidative hydrolysis again; (9) secondary separation of the platinum and palladium components; (10) degradation of sodium bromate; (11) production of an ammonium chloroplatinate precipitate; (12) filtering and washing of the ammonium chloroplatinate precipitate; (13) filtering and washing of the ammonium chloroplatinate precipitate; (14) drying of the ammonium chloroplatinate precipitate; and (15) calculation of the mass of the ammonium chloroplatinate precipitate. According to the invention, chemical reaction conditions and operation process for the conversion of elemental platinum into the ammonium chloroplatinate precipitate are improved and optimized; determination results are good in accuracy, stability and reliability; the steps of pyrolysis and colorimetric or spectral analysis of ammonium chloroplatinate are omitted; an analysis period is shortened; analysis efficiency is improved; and the method meets the production and quality control needs of enterprises.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for measuring platinum content in platinum-palladium alloy ornaments. Background technique [0002] The ammonium chloroplatinate gravimetric method is currently the main method for quantitatively analyzing the platinum content of platinum-palladium alloy jewelry in China. The principle is: through a chemical reaction in the water phase, the platinum element in the platinum-palladium alloy sample is converted into ammonium chloroplatinate and precipitated. Then through high temperature reaction, the ammonium chloroplatinate is converted into elemental platinum. Weigh the mass of elemental platinum, and calculate most of the platinum content in the sample. Use stannous chloride colorimetry or spectroscopic analysis to determine the platinum content in the residual aqueous phase. The platinum content of the two parts is added to obtain the platinum content in the plati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00G01N31/02
CPCG01N5/00G01N31/02
Inventor 邢培儒陆小春洪佳雄
Owner SHANGHAI LAO FENGXIANG JEWELRY RES INSTCO