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Method for determining content of arsenic in iron ore by using hydride generation-atomic fluorescence spectroscopy

An atomic fluorescence spectroscopy, hydride generation technology, applied in fluorescence/phosphorescence, preparation of test samples, material excitation analysis, etc., can solve the problems of low sensitivity detection limit, large number of operations, long process, etc. Low detection limit and small measurement error

Active Publication Date: 2013-07-10
包钢勘察测绘研究院
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Problems solved by technology

At present, the content of arsenic in iron ore is usually determined by potassium iodide extraction and separation-molybdenum blue photometry. Although this method has high sensitivity and low detection limit, it needs to be extracted twice during the analysis process, and the process is long and requires A large amount of organic reagents are used and the operation is cumbersome, and it takes at least 2 days to analyze a sample

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Embodiment Construction

[0025] The general idea of ​​the present invention is: melt and decompose the iron ore sample with sodium oxide, acidify it with dilute hydrochloric acid, then use ascorbic acid and thiourea to reduce the high-value arsenic to low-value arsenic, and at the same time mask the coexisting elements to obtain the iron ore sample solution ;The sample solution is introduced into the atomic fluorescence photometer, under the action of potassium borohydride, the arsenic is converted into arsine gas, which is sent to the quartz atomizer by the carrier gas, and after fully atomized, a characteristic fluorescence spectrum is emitted for fluorescence measurement ; Calculate the content of arsenic in the sample solution based on the fluorescence intensity measured by the arsenic standard solution of known concentration.

[0026] In the embodiments of the present invention, the reagents used are preferably:

[0027] Aqueous solution of hydrochloric acid: high-grade pure hydrochloric acid: mi...

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Abstract

The invention discloses an analysis method for determining arsenic in iron ore by using a hydride generation-atomic fluorescence spectroscopy. The method comprises the following steps of: preparing a sample solution of an iron ore sample, and preparing an arsenic standard solution; introducing the sample solution into an atomic fluorescence spectrophotometer, and determining the fluorescence intensity of the arsenic in the sample solution; and determining the content of the arsenic according to the fluorescence intensity which is determined on the basis of the arsenic standard solution with given concentration. By using the technical scheme disclosed by the invention, the content of the arsenic in the iron ore can be quickly 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 arsenic content in iron ore by hydride generation-atomic fluorescence spectrometry. Background technique [0002] Arsenic is a harmful impurity element in steel, so its composition needs to be tested from ore raw materials to ironmaking and steelmaking. At present, the content of arsenic in iron ore is usually determined by potassium iodide extraction and separation-molybdenum blue photometry. Although this method has high sensitivity and low detection limit, it needs to be extracted twice during the analysis process, and the process is long and requires A large amount of organic reagents are used and the operation is cumbersome, and it takes at least 2 days to analyze a sample. [0003] Hydride generation-atomic fluorescence spectrometry is a method to determine the content of the element to be measured by measuring the flu...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N1/28
Inventor 卢艳蓉丁美英
Owner 包钢勘察测绘研究院
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