Method for detecting heavy metal by using plasma atomic emission spectrometer

A technology of plasma and atomic emission, which is applied in the field of spectrometers, can solve the problems of easy-to-contaminate condenser mirrors, and achieve the effects of high detection efficiency, convenient use and operation, and simple and reasonable principles

Active Publication Date: 2018-11-13
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for detecting heavy metal by using plasma atomic emission spectrometer
  • Method for detecting heavy metal by using plasma atomic emission spectrometer
  • Method for detecting heavy metal by using plasma atomic emission spectrometer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for detecting heavy metals using a plasma atomic emission spectrometer, a plasma atomic emission spectrometer with a front optical path system of the present invention, the plasma atomic emission spectrometer includes a front optical path system, a spectroscopic detection system, a display control module, and a gas path system and the battery, the spectroscopic detection system includes a photoelectric conversion and signal processing module, the spectroscopic detection system is connected with the display control module, and is controlled by the display control module; the battery is respectively connected with the spectroscopic detection system and the display control module, and is respectively the The control module supplies power; the gas circuit system is provided with a working gas source and an airflow control valve, wherein the airflow control valve is connected to the working gas source, the working gas source is an inert gas, and the inert gas is argon...

Embodiment 2

[0039] Utilize the method that the plasma atomic emission spectrometer that has the optical path system before the plasma atomic emission spectrometer of embodiment 1 detects heavy metals, by figure 2 As shown, the following steps are included in sequence:

[0040] (1) Preparation of the solution to be tested: use the extractant diethylenetriaminepentaacetic acid or dilute acid solution to extract the metal elements in the soil sample by leaching to obtain the solution to be tested.

[0041] (2) First, open the gas flow control valve of the gas circuit system, and pass the inert gas working gas source from the inlet 3 into the inlet branch pipe 2, then enter the main pipe 1, the plasma excitation area 6 in turn, and finally from the gas outlet 4 Exhaust; the inert gas is argon.

[0042] (3) The gaseous sample to be tested is prepared by electrothermal evaporation:

[0043] The outlet of the electrothermal evaporation device 13 is sealed and connected with the air inlet 3 of...

Embodiment 3

[0052] Taking the test of available lead in soil as an example, the detection method and performance evaluation of the present invention will be described below.

[0053] Utilize the method for detecting lead in soil with the front optical path system plasma atomic emission spectrometer of embodiment 2, by figure 2 As shown, the following steps are included in sequence:

[0054] (1) Preparation of the solution to be tested: take 1 g of the soil sample, extract it with 5 ml of diethylenetriaminepentaacetic acid extractant for two hours, filter the extract to obtain the solution to be tested, and directly detect the solution to be tested.

[0055] (2) First, open the gas flow control valve of the gas circuit system, and pass the inert gas working gas source from the inlet 3 into the inlet branch pipe 2, then enter the main pipe 1, the plasma excitation area 6 in turn, and finally from the gas outlet 4 Exhaust; the inert gas is argon, and the gas flow rate is 0.3L / min.

[0056...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/67G01N21/01
CPCG01N21/01G01N21/67
Inventor 姜杰李娜张静张向楠刘向宇
Owner HARBIN INST OF TECH AT WEIHAI
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