Method for detecting the purity of gold precious metals(Part 3)

Gravimetric method

The gravimetric method refers to other chemical gravimetric methods besides the fire assay method, such as chemical reduction method and precipitation method.The principle is that the sample is decomposed by one or more reagents and filtered to remove insoluble impurities. The filtrate is added with a precipitating agent to precipitate the analyzed precious metal in the form of element or compound, thereby achieving the separation of the precious metal from other elements, and then filtered and washed , Put the filter paper and precipitate in a crucible and burn it to a constant amount in a high-temperature furnace, weigh it after cooling, and calculate the content of precious metals.The advantage of the gravimetric method is its low cost. In addition to the use of balances, no other expensive instruments are used.The advantages of this method are more obvious for samples that are not uniform or contain iridium, rhodium, ruthenium and other difficult-to-separate elements. The disadvantage of this method is that the analysis process is long, and there are many uncertain factors that are difficult to grasp in the analysis process, such as incomplete reduction, precipitation loss, and the introduction of new impurities, which will lead to unsatisfactory accuracy and precision of the analysis.



Post time: Jul-13-2020

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