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Method for detecting sulfide with reducing property

A technology for sulfide and air purification, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of increasing analysis complexity and analysis time, achieve quantitative analysis with high sensitivity and wide linear range, avoid The effect of radioactive, accurate and qualitative detection

Inactive Publication Date: 2014-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of detection sensitivity, it is usually necessary to use concentration and pre-enrichment methods to meet the requirements of the detection limit of substances, which increases the complexity and analysis time of the analysis.

Method used

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  • Method for detecting sulfide with reducing property
  • Method for detecting sulfide with reducing property
  • Method for detecting sulfide with reducing property

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Qualitative analysis of reduced sulfides by photoemission ion mobility spectrometry in negative ion mode. figure 2 It is the background spectrum of photoemission ion mobility spectrum in negative ion mode, mainly forming a reduced mobility of 2.51cm 2 V -1 the s -1 peak.

[0023] image 3 Ion mobility spectra of 2ppm carbon disulfide, 5ppm dimethyl sulfide and 2ppm dimethyl disulfide. It can be seen from the figure that the reduced mobility of the product ions of the three reducing sulfides is 2.27 cmV -1 the s -1 , that is, the same product ion is formed. The reason may be that under the irradiation of ultraviolet light, oxygen undergoes a photochemical reaction to form ozone, and the strong oxidizing property of ozone oxidizes carbon disulfide and sulfide compounds into sulfur dioxide. Sulfur dioxide and CO 3 - The water and ions react further to form SO 5 - of water and ions, that is, the reduced mobility is 2.27cmV -1 the s -1 product ions,

[0024] ...

Embodiment 2

[0026] Quantitative analysis of reduced sulfides by photoemission ion mobility spectrometry in negative ion mode. Figure 5 It is the quantitative curve of carbon disulfide in negative ion mode of photoemission ion mobility spectrometry, and the equivalent mobility of carbon disulfide in the range of 50ppb to 200ppm is 2.27cmV -1 the s -1 The intensity of the ion peak at is linear with the concentration, and only one product ion peak is formed. Using photoemission ion mobility spectrometry to measure carbon disulfide, accurate quantification can be carried out in the range of nearly four orders of magnitude, and the detection limit can reach 20ppb.

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Abstract

The present invention provides a method for rapidly and sensitively detecting a reducing sulfide. According to the present invention, an ion mobility spectrometry of a photoelectric emission ionization source is adopted as a base detection technology, purified air is adopted as carrier gas and drift gas, and oxidizing reagent ions formed through a photochemical reaction of air under ultraviolet light irradiation are adopted to determine the reducing sulfide; and the method adopts the oxidation reaction to oxidize the reducing sulfide so as to achieve the characteristic detection of the reducing sulfide, and perform quantitative analysis with characteristics of high sensitivity and wide linear range.

Description

technical field [0001] The invention relates to a method for detecting reducing sulfides. The method uses the ion mobility spectrum of the photoelectric emission ionization source as the basic detection technology, purifies the air as the carrier gas and drift gas, and utilizes the photochemical reaction of the air under the irradiation of ultraviolet light to form Oxidizing reagent ions realize accurate qualitative analysis of reducing sulfides and quantitative analysis with high sensitivity and wide linear range. Background technique [0002] In recent years, with the increasing environmental awareness of people, the determination of reducing sulfur compounds (RSCs) in the atmosphere has been paid more and more attention. Reducing sulfides are a class of environmental odor pollutants, mainly including hydrogen sulfide (H2S), carbonyl sulfide (COS), dimethyl sulfide (CH3SCH3), dimethyl disulfide (CH3SSCH3), 2-mercaptoethanol, 1, 2-ethanedithiol, carbon disulfide (CS2), etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
Inventor 李海洋程沙沙陈创王卫国周庆华温萌
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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