Method for detecting heavy metal by using plasma atomic emission spectrometer

Abstract

The invention relates to a method for detecting heavy metal by using a plasma atomic emission spectrometer, and solves the technical problems of inconvenient operation of the detection process of theheavy metal and high photosignal loss, high detection cost, low efficiency and low speed caused by the serious pollution of a diaphragm. The invention provides the method for detecting the heavy metalby using the plasma atomic emission spectrometer. The method comprises the following steps: (1) introducing a working air source into an air intake branch pipe from a gas inlet; (2) producing stableplasma in a plasma excitation area through a plasma excitation device after preparing a gaseous state to-be-detected sample; (3) after the gaseous state to-be-detected sample enters the plasma excitation area, exciting the gaseous state to-be-detected sample by the plasma, producing a corresponding characteristic photosignal, then transmitting out the characteristic photosignal along the inner part of a main pipe through the diaphragm through a daylight opening opposite to the direction of a gas outlet, entering into the spectrometer, and acquiring spectral information of a to-be-detected sample atom. The method is widely applied to the field of spectrographs of analytical instruments.

Description

technical field [0001] The invention relates to the field of spectrometers for analytical instruments, in particular to a method for detecting heavy metals using a plasma atomic emission spectrometer. Background technique [0002] With the globalization of environmental pollution, the whole society pays more and more attention to heavy metal pollution in soil. Existing soil heavy metal detection methods usually use methods such as atomic absorption spectroscopy, inductively coupled plasma atomic emission spectroscopy, and atomic fluorescence spectroscopy. The analysis and detection of the treated soil solution is cumbersome overall, and the instrument is large in size and high in detection cost, making it difficult to be widely used in on-site rapid detection. [0003] The front optical path system of the existing spectrometer mainly focuses the light into the optical fiber through the lens, and then transmits it to the spectrometer through the optical fiber. For example, th...

AI Technical Summary

Problems solved by technology

However, there is an insurmountable defect in light collection at the gas outlet. When detecting solids and other high-concentration liquid samples, the atomized sample gas flow will contain a lot of solid impurities, which will easily contaminate the condenser when it exits with the gas flow.

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