Method for determining platinum family element antimony assaying microwave digestion inductively coupled plasma mass spectrometry

Abstract

The invention discloses a method for determining a platinum family element antimony assaying microwave digestion inductively coupled plasma mass spectrometry, which comprises the specific flows as follows: the preconcentration of elements to be determined and the determination on microwave digestion assaying composite granules and an inductively coupled plasma mass spectrometry are realized through antimony assaying, and the separate concentration and the assay determination of platinum family elements in rock and mineral samples are realized. In the method for determining the platinum family element antimony assaying microwave digestion inductively coupled plasma mass spectrometry, antimony is used as an assaying collector, thus, not only can quantitative collecting on all the platinum family elements be realized but also obvious loss cannot be generated on the platinum family elements when cupellation is carried out; heating is carried out by selecting microwaves, so that the samples can be rapidly and evenly heated; the elements to be determined can be ensured to generate volatilization loss by a non-gas state in the digestion process by matching with an airtight digestion tank, and simultaneously, the digestion tank is also beneficial to forming a high-temperature and high-pressure atmosphere so as to further improve the digestion efficiency. The method for determining the platinum family element antimony assaying microwave digestion inductively coupled plasma mass spectrometry is suitable for the assay determination on the trace platinum family elements in the rock and mineral samples and has low detection limit, high sensitivity and high analysis speed. The cumulative time for sample assaying, digestion, determination and data processing on a single rock and mineral sample is 3-4 hours on average.

Description

technical field [0001] The invention relates to the analysis and determination technology of platinum group elements in rock ore samples, in particular to the determination method of platinum group element antimony test gold microwave digestion inductively coupled plasma mass spectrometry. Background technique [0002] The platinum group elements are the general term for the six elements of ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt). According to the density can be divided into two groups: osmium, iridium, platinum (22.48, 22.42, 21.4g / cm 3 ) is a heavy platinum group; ruthenium, rhodium, palladium (12.2, 12.4, 12.02g / cm 3 ) is the light platinum group. According to the symbiotic characteristics of elements, they can be divided into Ir group (Os, Ir, Ru, Rh) and Pd group (Pd, Pt). Platinum group elements are typical elements that are close to the earth's core and mantle, and their content in the earth's crust is extremely lo...

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Problems solved by technology

FAAS is relatively popular, but its detection limit is high, and it is often powerless for the analysis of trace platinum group elements in rock and mineral samples; although GFAAS has a low detection limit, it is limited by its single-element analysis characteristics. Therefore, the efficiency is low when dealing with large-scale multi-element analysis tasks; ICP-OES can realize multi-element analysis, and the sample throughput is greatly increased, but its detection limit is especially inferior to that of GFAAS, so the application range is limited to a certain extent

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