Method for determining lead content in iron ore through hydride generation-atomic fluorescence spectrometry

A technique of atomic fluorescence spectroscopy and hydride generation, which is applied in the fields of fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of great harm to operators, large background interference of samples, fumes from perchloric acid, etc., and achieves simple operation and high measurement speed Fast, low detection limit effect

Active Publication Date: 2014-01-29
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

At present, the determination of lead in iron ore is mostly determined by flame-atomic absorption. This method has low sensitivity and large background interference of the sample. In addition, a large amount of perchloric acid needs to be fumed during the sample dissolution process, which not only pollutes the environment, but also easily causes fire and explosion

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  • Method for determining lead content in iron ore through hydride generation-atomic fluorescence spectrometry

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Embodiment Construction

[0026] The general thinking of the present invention is: the iron ore sample is melted and decomposed with sodium peroxide and sodium hydroxide, acidified with dilute hydrochloric acid, then oxalic acid is used to mask the coexisting elements to eliminate the influence, and potassium ferricyanide is used to decompose the Pb 2+ Oxidized to Pb 4+ , to obtain the sample solution of iron ore; introduce the sample solution into the atomic fluorescence photometer, under the action of potassium borohydride, the lead is converted into lead hydrogen gas, which is sent to the quartz atomizer by the carrier gas, fully atomized and then emitted The characteristic fluorescence spectrum is obtained, and the fluorescence measurement is carried out; the content of lead in the sample solution is calculated according to the fluorescence intensity measured by the lead standard solution of known concentration.

[0027] In the embodiments of the present invention, the reagents used are preferably:...

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Abstract

The invention discloses a method for determining a lead content in iron ore through hydride generation-atomic fluorescence spectrometry. The method comprises the steps of preparing a sample solution of an iron ore sample and a blank solution of the sample, and preparing a lead standard solution; introducing the blank solution to an atomic fluorescence photometer, and testing fluorescence intensity of lead in the blank solution; and introducing the sample solution to the atomic fluorescence photometer after blank value compensation, testing fluorescence intensity of lead in the sample solution, and obtaining content of the lead in the sample solution according to the fluorescence intensity which is tested depending on the lead standard solution with known concentration. According to the technical scheme disclosed by the invention, the content of the lead in the iron ore can be rapidly and accurately determined.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgical analysis, in particular to a method for determining lead content in iron ore by hydride generation-atomic fluorescence spectrometry. Background technique [0002] Lead is a harmful impurity element in steel, which can reduce the plasticity and impact of steel. Therefore, from ore raw materials to ironmaking and steelmaking, its composition needs to be tested. At present, the determination of lead in iron ore is mostly determined by flame-atomic absorption. This method has low sensitivity and large background interference of the sample. In addition, a large amount of perchloric acid needs to be fumed during the sample dissolution process, which not only pollutes the environment, but also easily causes fire and explosion. [0003] Hydride generation-atomic fluorescence spectrometry is a method to determine the content of the element to be measured by measuring the fluorescence...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 卢艳蓉
Owner INNER MONGOLIA BAOTOU STEEL UNION
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