A miniature atomization/ionization detection device and method thereof

Abstract

The invention discloses a method and a device for detecting micro-atomization / ionization. The method includes: allowing a sample to enter an electrolytic cavity, allowing to-be-detected elements to deposit on an electric heating wire under electrolysis, discharging waste liquid, drying the electrolytic cavity with heating of the electric heating wire under the help of carrier gas, allowing gradual temperature rising of the electrolytic cavity until high-temperature evaporation and atomization are completed, by the carrier gas, loading to-be-detected atom vapor to a dielectric barrier discharge cavity, allowing incident light to shoot in an inclined angle after plasma is generated, allowing the incident light to reflect on a reflector in the dielectric barrier discharge cavity for multiple times, then allowing the incident light to obliquely shoot out from a carrier gas port, allowing the light shot out to be received by a detector, and detecting signals. Optical path length can be adjusted according to needs by adjusting incidence angle. Due to the fact that the incident light shoots out obliquely, background light interference caused by discharge can be avoided effectively. The device is simple in structure, small in size, low in working conditions, high in atomization efficiency, high in flexibility, good in stability and wide in application range, and miniaturization, automation and portability of analyzing instruments are facilitated.

Description

technical field [0001] The invention relates to a miniature atomization / ionization detection device and a method thereof, belonging to the technical field of instrument analysis. Background technique [0002] Sample introduction technology has always been the "bottleneck" that limits the sensitivity improvement of atomic spectrometry, and is the most active and important research field in the development of atomic spectrometry. Now it mainly includes pneumatic atomization method, ultrasonic atomization method, thermal atomization method, suspension atomization method, high pressure atomization method and electrospray method. Pneumatic atomization mainly has obvious defects in atomization efficiency, high salt resistance and memory effect; ultrasonic atomization has high cost and large matrix effect, so it is necessary to have a desolvation auxiliary system, which is not conducive to the miniaturization of the instrument ; Thermal atomization has a high atomization efficienc...

AI Technical Summary

Problems solved by technology

[0009] At present, most of the disclosed micro-atomization methods and devices require auxiliary devices such as vacuum or desolvation, which is not conducive to the miniaturization of the overall instrument. The operation of some is unstable, the reproducibility is poor, some have a narrow scope of application, and are only analytes that are volatile or easily form volatile substances, and some have serious matrix interference and strong background light interference, etc.

[0010] At present, some atomization methods and devices based on dielectric barrier discharge have been disclosed. They generally export plasma to the discharge chamber for detection. The disadvantages of this method are short optical path, complex structure, and instability after plasma is exported.

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