Method and apparatus for measuring chromium by chemical vapor generation-atomic fluorescence spectrometry

A technology of chemical vapor generation and atomic fluorescence spectroscopy, which is applied in measuring devices, scientific instruments, electrical excitation analysis, etc., can solve problems such as the inability to detect chromium, achieve stable and reliable measurement, simple equipment structure, and reduce testing costs

Inactive Publication Date: 2006-05-10
BEIJING JITIAN INSTR CO LTD
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Problems solved by technology

In the existing measurement techniques, except for the expensive inductively coupled plasma-atomic emission (ICP-AES) and inductively coupled plasma-mass spectrometry (ICP-MS), there is no cheap instrument that can simultaneously detect the above four elements. This is undoubtedly a new technical barrier f

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  • Method and apparatus for measuring chromium by chemical vapor generation-atomic fluorescence spectrometry
  • Method and apparatus for measuring chromium by chemical vapor generation-atomic fluorescence spectrometry
  • Method and apparatus for measuring chromium by chemical vapor generation-atomic fluorescence spectrometry

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Embodiment Construction

[0019] The chemical vapor generation atomic fluorescence spectrometry method of chromium of the present invention comprises the chemical vapor generation process of chromium (Cr), the atomization process of the gas phase substance and the Cr atomic fluorescence detection process.

[0020] Described chemical gas phase generation process: at first the solution to be measured containing chromium is acidified, because chromium can form numerous stable complexes, significantly influence measurement, so adopt nitric acid (HNO 3 ) or hydrochloric acid (HCl) or a mixture of the above two acids. In addition, in order to improve the sensitivity of detection and improve the linearity of sub-milligram / liter (ppm) level measurement, it is also necessary to add 1-20 mg / liter (ppm) of sensitizing elements to the acidified solution, such as antimony (Sb) , lead (Pb) or arsenic (As), etc. Secondly, the test solution acidified and added with sensitizing elements is introduced by the peristalti...

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Abstract

The invention relates to a method for measuring chemical gas phase genesis atomic fluorescence spectrum of chromic and corresponding apparatus. The method comprises chemical gas phase genesis process of chromic; atomize process of genesis gas phase object and fluorescence detecting process of chromic molecule. The apparatus comprises a gas-liquid separating device having a color scatter atom fluorescence spectrometer, wherein the gas-liquid separating device comprising a gas-liquid separating device and a reactor which one end being connected with reducer and current-carrying/sample pipe, the other end being connected with the gas-liquid separating device which having its one end connected with a atomize device that connected with gas mixer, and have the other end connected with exhaust pipe. The invention has the advantages of being stable and reliable.

Description

technical field [0001] The utility model relates to a chemical gas phase generation (CVG) method, in particular to a chemical gas phase generation atomic fluorescence spectrum measurement method for chromium. Background technique [0002] The chemical vapor generation (CVG) method is a high-efficiency sampling technology widely used in atomic spectrometry. The general method is: mix the solution containing the element to be measured with the reducing agent solution at an appropriate acidity, and the mixed liquid is in the Fully react in a pipe of a certain size, the gas-liquid mixture formed by the reaction is divided into two phases in the separator, the liquid phase flows out through the waste pipe, and the gas phase containing the element to be measured is carried by the carrier gas into the atomizer for detection . The characteristic of chemical vapor phase generation sampling technology is that it can separate the element to be measured from the liquid phase, greatly e...

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Application Information

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IPC IPC(8): G01N21/66G01N21/71
CPCG01N21/6404
Inventor 刘霁欣刘明钟陈志新裴晓华陈红军
Owner BEIJING JITIAN INSTR CO LTD
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