Measurement method of atomic absorption

A technology of atomic absorption and measurement method, applied in the field of analytical chemistry, to achieve the effect of correct atomic absorption measurement and accurate calculation

Active Publication Date: 2012-07-04
GUOBIAO BEIJING TESTING & CERTIFICATION CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to realize accurate measurement of atomic absorption by glow atomization, the present invention proposes a measurement method of atomic absorption using glow atomizer, which successfully solves this problem

Method used

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with embodiment:

[0021] The used glow discharge atomizer of the inventive method is as figure 2 As shown, the side view is as image 3 or Figure 4 shown, which includes:

[0022] A hollow cavity body 1 is provided with an air suction port 4 which can be connected with a vacuum pump, a vacuum gauge interface 5 which can be connected with a vacuum gauge, and an air inlet 6 which can be connected with a gas supply pipeline;

[0023] Two transparent quartz windows 2, which are sealed at both ends of the hollow cavity 1;

[0024] An anode 7, which runs through the inside and outside of the hollow cavity 1 and is insulated and sealed with the hollow cavity 1, and the anode 7 is connected to the positive pole of the power supply;

[0025] A mounting base 3, which is connected to the underside of the hollow cavity 1;

[0026] A sample platform 10, which is arranged on the top of the hollow cavity 1 an...

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Abstract

The invention belongs to the technical field of analytical chemistry, in particular relates to a measurement method of atomic absorption. The measurement method is used for measuring atomic absorption through correcting light emission of an element to be measured in a glow atomizer. The measurement method comprises the following steps of: respectively supplying power to the glow atomizer and a light source by adopting different frequencies of pulses; and respectively acquiring a signal I0 of light source light emission, a signal IG of glow discharge pulse light emission and a signal IH generated when a light source light-emitting pulse is overlapped with a glow discharge light-emitting pulse, correcting the signal of glow light emission to obtain a signal IH-IG of light source transmission light, calculating an absorbance A=logI0/(IH-IG) generated by the element to be measured in the glow atomizer, and figuring out the content of the element to be measured according to a function relationship of the absorbance and the content of the element to be measured and the absorbance of a sample. By adopting the measurement method of the atomic absorption, the change before and after light emitted by the light source penetrates through the glow atomizer is accurately measured, and the content of the element to be measured in the sample can be accurately figured out.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, in particular to a method for measuring atomic absorption. Background technique [0002] Atomic absorption spectrometry is a widely used analysis method, mainly used for the analysis of trace or trace metal elements. Existing commercial atomic absorption spectrophotometers mainly use flame atomizers or electrothermal atomizers to realize the atomization of the measured elements, so the solid samples can only be made into solutions in advance, or the solid samples can be crushed into fine particles for atomic absorption measurements. [0003] Glow discharge is a low-voltage gas discharge phenomenon. When the glow discharge is maintained by high-voltage direct current, the cathode sputtering effect occurs on the cathode, and the atoms of the cathode material escape from the surface of the material to form ground state atoms, excited state atoms or ions. The glow discharge device deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 郑永章李继东苏延静陈辉宋雅东
Owner GUOBIAO BEIJING TESTING & CERTIFICATION CO LTD
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