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An electronic nose system for rapid detection of volatile chlorinated hydrocarbon pollution

A technology of volatile and chlorinated hydrocarbons, applied in the field of rapid detection electronic nose system, to achieve the effect of low power consumption, light weight, rapid identification and quantitative detection

Active Publication Date: 2011-12-28
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of rapid detection and on-line monitoring of volatile chlorinated hydrocarbon gases in the environment, and to provide a small volume, light weight, and anti-interference electronic nose system for detecting volatile chlorinated hydrocarbon gases

Method used

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  • An electronic nose system for rapid detection of volatile chlorinated hydrocarbon pollution
  • An electronic nose system for rapid detection of volatile chlorinated hydrocarbon pollution
  • An electronic nose system for rapid detection of volatile chlorinated hydrocarbon pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 (air pollution detection)

[0037] Sensor array composition: PID sensor energy is 10.6 eV, produced by BASELINE Company of the United States; gas sensor is TGS2602 (S1), TGS2600 (S2), TGS2620 (S3) of FIGARO Company of Japan. Using the GASTEC standard gas generating device, put the diffusion tubes with different organic volatile solvents into the constant temperature gas diffusion chamber at the same time, use high-purity air as the dilution gas, and prepare mixed organic gases with different concentrations as the detection gas by changing the flow rate of the dilution gas . Turn on the air pump 13 with a flow rate of 0.5 L / min, first switch the three-way valve 15 to collect high-purity air 9 to flush the system and collect the baseline, and then switch the three-way valve to collect the detection gas 8 after the baseline is stable and then enter the gas drying pipe 10, separate Pipe 11, air chamber 12, after extracting the response signal curve, switch the th...

Embodiment 2

[0038] Example 2 (Monitoring of Soil Vacuum Extraction Effect)

[0039] The composition of the sensor array is the same as in Embodiment 1. At the vacuum extraction site for soil remediation, the extracted soil gas 8 is collected at the extraction wellhead by an air pump 13 with a flow rate of 0.5 L / min, and enters the gas drying tube 10, separation tube 11, and gas chamber 12 in sequence, and the response signal curve is extracted. The entire system is controlled by switching valves at regular intervals to realize automatic monitoring, and data is collected every hour to draw extraction time and response curves. attached Figure 5 It is a response curve for simulating the vacuum extraction and desorption process of volatile chlorinated hydrocarbons in polluted soil. It can be seen from the figure that in the initial stage of vacuum extraction, the concentration of volatile chlorinated hydrocarbons in the soil is relatively high, and the response voltage value is relatively ...

Embodiment 3

[0040] Example 3 Wastewater Pollution Detection

[0041] Take 100 mL of the collected water sample in a 1000 mL gas scrubber bottle, place the gas scrubber bottle in a water bath at 50°C to keep the temperature constant, and use a 0.2 L / min gas pump 13 to extract the gas from the upper part of the gas cylinder into the gas drying tube 10 and separation tube 11 in sequence , the gas chamber 12, extracting the response signal. According to the gas-liquid equilibrium relationship formula, the concentration of volatile chlorinated hydrocarbon pollutants in the water sample is calculated by using the measured gas concentration value.

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Abstract

An electronic nose system for rapid detection of pollution of volatile chlorinated hydrocarbons. The electronic nose system comprises a gas chamber gas passage unit which comprises a gas pipe, a pump, a magnetic valve, a conversion joint and a gas chamber and can finish processes of gas collection, detection, flushing and the like through controlling states of the magnetic valve and the pump, a gas pretreatment unit which is arranged in front of a gas inlet of the gas chamber gas passage unit and is utilized for removing moisture and interfering substances, a sensor unit which is arranged in the gas chamber and is utilized for acquisition of gas response signals, an embedded system which is arranged outside the gas chamber and is utilized for automatic control of the whole electronic nosesystem and processing, display and storage of signals, and a system housing which comprises an external casing, buttons, a mainboard, a display screen, a power supply module and the like and is utilized for providing power and data monitoring real-time display for the whole electronic nose system. The whole electronic nose system is controlled by the embedded system and has the advantages of low power dissipation, small volume, light weight, convenience of carrying, and effect of realization of online environmental monitoring.

Description

technical field [0001] The invention relates to an electronic nose system for rapid detection of volatile chlorinated hydrocarbon pollution in soil, water, air and other environments, in particular to an intelligent electronic nose system for selective analysis and detection of volatile chlorinated olefins and chlorinated alkanes in the environment Electronic nose system. Background technique [0002] Volatile chlorinated hydrocarbons are commonly used chemical raw materials and organic solvents. They are widely used in large quantities, highly volatile, stable in performance and have various toxic effects. Improper methods in the production, use, storage and disposal of volatile chlorinated hydrocarbons can easily cause environmental pollution such as air, soil and water, and pose health risks. [0003] Volatile chlorinated hydrocarbons are usually detected using gas chromatography techniques. Gas chromatography can comprehensively analyze the composition of pollutants an...

Claims

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Application Information

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IPC IPC(8): G01N27/00G01N27/62G01N1/34
Inventor 刘锐万梅蔡强陈吕军
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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