Method for determining rare earth elements in super-based rock by ICP-MS

Abstract

The invention provides a method for determining rare earth elements in a super-based rock by ICP-MS. The method comprises the following steps: accurately weighing a powder sample and putting the powder sample into a sample dissolving bomb; adding high-purity nitric acid and high-purity hydrofluoric acid in sequence; putting the sample dissolving bomb into a steel sleeve, screwing and putting the sample dissolving bomb into a drying oven for heating; after the sample dissolving bomb is cooled and the cover is opened, putting the sample dissolving bomb on an electric heating plate and evaporating to dryness; adding nitric acid and evaporating to dryness again; adding high-purity nitric acid and ultrapure water; putting the sample dissolving bomb into the steel sleeve, screwing and putting the sample dissolving bomb into the drying oven for heating; putting the sample dissolving bomb on the electric heating plate and evaporating to dryness; adding hydrochloric acid and evaporating to dryness again; adding hydrochloric acid and dissolving; centrifuging the sample by utilizing a centrifugal machine; taking supernatant and putting the supernatant on a column; adding hydrochloric acid towash the column and adding hydrochloric acid to connect the sample; after evaporating the sample to dryness, adding nitric acid; after evaporating to dryness again, adding nitric acid and fixing the volume; finally, determining the content of the rare earth elements in the sample by ICP-MS. According to the method provided by the invention, the ultralow-low-content rare earth elements in the super-based rock can be effectively detected; an obtained rare earth partition curve is smooth in distribution and a detection result is accurate and reliable.

Description

technical field [0001] The invention relates to a method for detecting rare earth elements in ultrabasic rocks, in particular to high temperature and high pressure airtight digestion of ultrabasic rock samples, separation and enrichment of samples, and a method for measuring rare earth elements in ultrabasic rocks by using ICP-MS. Background technique [0002] The unique physical and chemical behavior of rare earth elements in the process of geological processes makes rare earth elements play an important role in earth science research. As geochemical indicators, data such as the abundance and distribution of rare earth elements and their isotopes are very important for the study of the origin and classification of rocks and minerals. The physical and chemical conditions of diagenesis and mineralization, the source of metallogenic materials, deposition and metamorphism, the origin and evolution of the crust and mantle, and even the moon and solar system played a very importan...

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Problems solved by technology

However, this patent can only detect rare earth elements in petroleum, and the detection area is limited, so it cannot detect rare earth elements in ultrabasic rocks

At the same time, the microwave digestion method in this patent is not suitable for the digestion of geological rock samples, because the rock samples are mainly composed of inorganic components, and the composition is complex, and there are many insoluble accessory minerals in many rock samples, such as zircon and rutile etc. Microwave digestion is difficult to completely dissolve these accessory minerals, so the current mainstream digestion method for geological samples is still high temperature and high pressure airtight digestion method

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