Electro-thermal vaporization atomic fluorescence spectrometry method and spectrometer used for determining cadmium

Abstract

The invention discloses an electro-thermal vaporization atomic fluorescence spectrometry method and a spectrometer used for determining cadmium. An atomizer of the electro-thermal vaporization atomic fluorescence spectrometer comprises an atomizing apparatus and a collecting trap. The collecting trap is composed of a tungsten filament or a molybdenum filament, a support, a housing and a power source. A sealed space is formed by the housing and the support. The tungsten filament or the molybdenum filament is arranged on the support. The tungsten filament or the molybdenum filament is positioned in the sealed space formed by the housing and the support. An inlet and an outlet are arranged on the housing. The electro-thermal vaporization atomic fluorescence spectrometry method used for determining cadmium comprises steps that: a sample requiring testing is dried in air, and is cinerated, such that ash is obtained; under an argon atmosphere, the ash is heated to 1600 to 2000 DEG C, and the obtained vapor contacts the tungsten filament or the molybdenum filament; under an atmosphere of hydrogen and argon, the temperature of the tungsten filament or the molybdenum filament is increased to 1600 to 2000 DEG C, cadmium atoms are released, and the content of the cadmium atoms are analyzed by using a fluorescence spectrometry method. With the electro-thermal vaporization atomic fluorescence spectrometry method and the spectrometer used for determining cadmium provided by the invention, matrix interference can be effectively eliminated, and accurate measuring of cadmium can be realized.

Description

Technical field [0001] The invention relates to an electrothermal evaporation atomic fluorescence spectrometry and a spectrometer for measuring cadmium. Background technique [0002] Due to a large amount of sewage irrigation and the abuse of fertilizers, my country has been severely polluted by cadmium (Cd), and some areas have developed to the level of "cadmium rice": Cd concentration in rice produced in a sewage irrigation area in Shenyang is as high as 0.4-1.0 mg / kg. Has reached or exceeded the average Cd concentration that induces "bone pain". In view of this, the rapid measurement technology of Cd has received extensive attention in recent years, and a series of rapid measurement methods based on biosensors, colorimetry, enzyme inhibition, electrochemistry and atomic spectroscopy have been developed. But most of these methods can only detect heavy metal ions in the solution, and still cannot avoid the time-consuming and laborious sample pretreatment process; and it is diffi...

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Problems solved by technology

When the online trapping techniques reported in the literature are used for the measurement of Cd, most of them can only trap hydrides or free atoms formed in the flame, but the trapping of Cd introduced by electrothermal evaporation has not been reported, which is mainly due to the fact that the electrothermal Most of the Cd formed by evaporation exists in the form of nanoparticles, which cannot be effectively captured

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