Sampling system for liquid cathode glow discharge spectrometer

Abstract

The invention relates to a sampling system for a liquid cathode glow discharge spectrometer. The sampling system comprises a micro-plasma induced steam generator unit and a connecting unit for connecting the liquid cathode glow discharge spectrometer and the micro-plasma induced steam generator unit. The micro-plasma induced steam generator unit induces a sample solution to be detected to generate steam based on liquid cathode glow discharge micro-plasma; the connecting unit is used for conveying mixed gas of to-be-detected metal ion steam generated by the micro-plasma induced steam generator unit and carrier gas to a hollow anode of the liquid cathode glow discharge spectrometer through the connecting unit, and the mixed gas enters a glow discharge area and is excited to generate a characteristic emission spectral line. The sampling system based on atmospheric pressure liquid cathode glow discharge micro plasma induced steam generation is used for realizing gas sampling of SCGD-OES.

Description

technical field [0001] The invention belongs to the field of atomic spectroscopic analysis, and relates to a sample feeding system for a heavy metal element detection device, and more specifically, to a sample feeding system for a liquid cathode glow discharge spectrometer. Background technique [0002] For a long time, various methods for detecting metal ions have been established. Instruments such as inductively coupled plasma atomic emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS) can detect heavy metal ions sensitively, but they are usually bulky. , complex equipment, and high power consumption, these shortcomings limit their application for rapid analysis in the field, which makes the development of small and low-cost instruments highly desirable. [0003] Liquid cathodoglow discharge atomic emission spectroscopy (SCGD-OES) has been considered as a promising excitation source for miniaturization due to its simple design, low runn...

AI Technical Summary

Problems solved by technology

However, during the generation of hydride, the transition metal will react with the reducing agent, and the hydride to be analyzed will be decomposed catalytically on the surface of the interfering metal, and sodium borohydride is expensive and its aqueous solution is unstable

Electrothermal evaporation has high sample introduction efficiency and requires a small number of samples, but it requires high current, poor repeatability, long measurement time, and samples are easily lost during the drying and pyrolysis stages

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