Method for separating Co, Zn and Ni isotopes in solution or solid sample and application

Abstract

The invention belongs to the technical field of isotope testing, and discloses a method for separating Co, Zn and Ni isotopes in a solution or a solid sample and application, the method comprises the following steps: adjusting the pH value of a rock sample solution twice to match the components and pH value of an ion chromatography leacheate; the pH value of the rock sample solution is adjusted for the first time: after the rock sample is subjected to high-pressure closed ore dissolution and evaporation to dryness, HClO4 is added for evaporation to dryness, HNO3 is added for evaporation to a wet salt state, H2O is repeatedly added for evaporation to a wet salt state, then the volume is fixed, and the pH value is controlled to be about 1.5; adjusting the pH value of the rock sample solution for the second time: taking the rock sample solution of which the pH value is controlled to be about 1.5, diluting, adding high-purity ammonia water, and adjusting the pH value to 5.3; the matching of the components and the pH value of the ion chromatography leacheate comprises the following steps: preparing the ion chromatography leacheate, and adjusting the pH value of the leacheate to 4.8 by using high-purity ammonia water. According to the method, the matrix effect of main transition metal elements such as Fe is reduced, and Co, Zn and Ni isotopes are rapidly and simultaneously separated.

Description

technical field [0001] The invention belongs to the technical field of isotope testing and the application expansion of high-pressure ion chromatography, especially the separation of trace elements such as Co, Zn and Ni in whole rock samples with complex matrix. In particular, it relates to a method and application for separating Co, Zn and Ni isotopes in rock samples. Background technique [0002] At present, due to the complex matrix of rock samples, the separation of target elements is usually carried out by multiple passages through the column after high-pressure airtight dissolution. In order to effectively remove impurity elements, it is usually necessary to match the type of acid, the concentration of the acid, and the volume of the acid to wash off the matrix elements and interfering elements in sequence, and then elute and collect the target elements at a specific acid concentration. The process of this element separation method is complex and time-consuming, and e...

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Problems solved by technology

In addition, the above process of passing through the column is carried out under atmospheric pressure, and the leaching is carried out by gravity, which is very slow and takes about 1 day

Since the separation of Zn and Ni isotopes cannot be compatible in the same process, the time and labor costs for simultaneous separation of Zn and Ni isotopes are doubled

Therefore, the above method has many steps, time-consuming and labor-intensive, and the target elements Co, Zn and Ni cannot be separated at the same time, which increases the time and labor costs, and is not conducive to the related isotope analysis and testing of large quantities of rock samples.

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