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Method for determining content of elements in potassium-bearing ore by ICP (Inductively Coupled Plasma) internal standard method

A technology of element content and internal standard element, applied in the direction of material excitation analysis, thermal excitation analysis, etc., can solve the problems of signal change and instrument drift that are difficult to eliminate, and achieve the effect of improving precision and accuracy and reducing matrix effect

Inactive Publication Date: 2016-07-27
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0003] During the measurement process of ICP-OES method, changes in the temperature of the instrument, power supply, argon gas, cooling water, peak position, background, stabilization time, measurement time and other factors will cause signal changes and drifts, that is, to some extent Instrument drift is difficult to eliminate

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  • Method for determining content of elements in potassium-bearing ore by ICP (Inductively Coupled Plasma) internal standard method

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Embodiment 1

[0028] Step (1): Weigh 0.200g of potassium feldspar ore powder into a 30ml platinum crucible, add 1.500g of melting agent (the mass ratio of sodium carbonate to sodium tetraborate is 2:1), mix well, and put it into a muffle furnace . Gradually heat up to 950°C, melt at this temperature for 60 minutes, take it out and cool to room temperature, wash the outside of the platinum crucible with deionized water, put the platinum crucible into a 150ml beaker containing 70ml of hydrochloric acid solution, cover the beaker with a watch glass and place Heat and boil on the heating platform. After the sample in the crucible is completely leached, wash the crucible with deionized water and take it out. After the solution is cooled, move it to a 100ml volumetric flask, and add 2mg·L -1 The internal standard element yttrium, constant volume, shake well for use, this solution is used to determine the content of calcium, magnesium, barium, titanium and manganese. Pipette the above solution (w...

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Abstract

The invention relates to a method for determining the content of elements in a potassium-bearing ore by an ICP (inductively coupled plasma) emission spectroscopy internal standard method. The method comprises the following steps: firstly, with sodium carbonate-sodium tetraborate as a molten solvent, melting a potassium-bearing ore sample at a high temperature, and dissolving melt with a dilute hydrochloric acid solution; and carrying out qualitative and quantitative analysis on multiple elements in the ore by ICP. In the measurement process, the determination accuracy of the elements is affected due to introduction of the molten solvent and hydrochloric acid, the molten solvent element which is equivalent to the sample is added to a standard solution to remove the matrix effect, an yttrium element is selected as the internal standard to be added to the standard solution and the sample solution at the same concentration, and the relative intensity is measured to compensate a signal value drift caused by an instrument. By combining the internal standard method and a matrix matching method, interference caused by changes of the instrument operating condition, the atomization efficiency and the like is reduced; the matrix effect is effectively removed; the accuracy and the precision of the determination result are improved; and the method is suitable for accurate analysis of multiple elements in the potassium-bearing ore.

Description

【Technical field】 [0001] The invention relates to the technical field of element analysis, in particular to an ICP internal standard method for determining element content in potassium-containing ores. 【Background technique】 [0002] my country is rich in potassium-containing resources represented by potassium feldspar, nepheline, illite, etc., with reserves of more than 20 billion tons. The use of potassium-containing ores to extract potassium has huge potential economic needs for the strategic needs of ensuring the sustainable development of my country's economy. value and social benefits. Therefore, it is necessary to develop accurate and rapid methods for the analytical measurement of the composition and composition of potassium-bearing ores. At present, the analysis and measurement methods of various elements in potassium-bearing ores mainly include chemical methods, atomic absorption spectrometry and X-ray fluorescence spectrometry. Among them, the chemical analysis m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
Inventor 刘程琳罗孟杰薛金江友法李平于建国
Owner EAST CHINA UNIV OF SCI & TECH
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