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Volatile organic compound detection quality control device and method

A volatile organic compound and quality control technology, which is applied in measuring devices, analyzing gas mixtures, instruments, etc., to achieve the effects of reducing pipeline retention loss, avoiding water vapor condensation, and improving the efficiency of zero division

Pending Publication Date: 2021-06-01
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above defects, the present invention provides a quality control operation for detecting volatile organic compounds by periodically switching channels of sample gas, zero gas and standard gas; The temperature of the gas is consistent with the detected environment, which not only avoids water vapor condensation caused by too high a dew point, but also reduces the loss of detection data caused by retention and loss of more viscous formaldehyde, formic acid and other substances in the detected volatile organic compounds (VOCs) in the pipeline Accurate volatile organic compound detection quality control device and method

Method used

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  • Volatile organic compound detection quality control device and method

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Effect test

Embodiment 1

[0040] like figure 1 As shown, a volatile organic compound detection quality control device provided by the present invention includes an outdoor air PTFE filter 1 connected with the outdoor air inlet 1-1, an indoor air filter connected with the indoor air inlet 2-1 Gas PTFE filter 2, indoor and outdoor sampling electromagnetic switching valve 6 connected with outdoor gas PTFE filter 1 and indoor gas PTFE filter 2, outdoor gas PTFE filter 1 and indoor and outdoor sampling electromagnetic switching valve 6 Connected through the outdoor sampling tube 3, the electromagnetic switching valve 6 is connected with the drainage tee 10 provided in the quality control device 20 through the sampling tube 6-1, and the quality control device 20 also includes a flow controller 9, a first catalytic zero Switching valve 11, second catalytic zero-dividing switching valve 12, drainage pump 8, calibration gas selection valve 13, platinum cotton catalytic tube furnace 14, drying molecular sieve 15...

Embodiment 2

[0052] The present invention also provides a quality control method for detecting volatile organic compounds using the device provided in Example 1, comprising the following steps:

[0053] S1: Collect outdoor ambient air: turn on the drainage pump 8, control the preset flow rate through the flow controller 9, the outdoor air to be collected enters the outdoor sampling pipe 3 through the outdoor PTFE filter 1, and passes through the normally open end of the electromagnetic switching valve 6 After entering the water vapor separator 7 and directly passing through the negative pressure sensor 19, it enters the drainage tee 10, the flow controller 9 and the drainage pump 8 to complete the external air drainage function. At this time, another sample gas with a small flow rate passes through the drainage tee 10 and another One end enters the NO-COM end of the second catalytic de-zero switching valve 12 through the COM-NO end of the first catalytic de-zero switching valve 11, and then...

Embodiment 3

[0057] On the basis of Embodiment 2, the present invention also has the following steps before the operation of the S1 step and the S2 step:

[0058] Close the drainage pump 8, open the NC-COM end of the calibration gas selector valve 13, enter the S1 step to collect outdoor gas samples through the single calibration gas inlet 13-2 for 15 minutes, and then enter the S1 step to collect outdoor gas samples. A single-concentration calibration gas is preset to verify the span accuracy of the analyzer, and the span calibration gas verification combined with daily zero-gas background verification can ensure that the analyzer is in a quality control state.

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Abstract

The invention provides a volatile organic compound detection quality control device and method. The device comprises an outdoor gas tetrafluoride filter, an indoor gas tetrafluoride filter and an indoor and outdoor sample injection electromagnetic switching valve. The detection quality control operation of the volatile organic compounds is realized by periodically switching the sample gas channel, the zero gas channel and the standard gas channel; the environment temperature is monitored in real time, the heat preservation temperature of the sampling pipeline is adjusted at any time, what is guaranteed is that the detected outdoor gas is consistent with the detected environment temperature, and water vapor condensation caused by too high dew point is avoided; the situation of inaccurate detection data caused by retention loss of formaldehyde, formic acid and the like with relatively high viscosity in the detected volatile organic compound in the pipeline can be reduced; sampling environment conditions are judged in real time, indoor and outdoor sampling channels are switched in time, and invalid sampling and sampling hidden dangers can be avoided; meanwhile, the variable adjustment of the drainage flow is more suitable for being applied to different sites; and by monitoring the pressure of the sampling pipeline, the smoothness of the sampling channel is effectively ensured, and the quality control requirement is met.

Description

technical field [0001] The invention belongs to the technical field of volatile organic compound detection devices, and in particular relates to a volatile organic compound detection quality control device and method. Background technique [0002] High Sensitivity Proton Transfer Reaction Mass Spectrometry (PTR-MS) is a fast and new online detection technology for volatile organic compounds (VOCs). Commercial instruments were put into use in the late 1990s and are now often It is used for online measurement of ambient atmospheric VOCs. The device continuously and stably extracts a fixed flow of gas from the atmosphere. After entering the instrument, it mainly uses VOC species and water and hydrogen ions (H 3 o + ) proton transfer reaction, and then use the mass spectrometry system to generate protonated VOC ions (RH + ) for rapid quantitative measurement. [0003] VOCs generally refer to organic compounds with high saturated vapor pressure, low boiling point, small relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
CPCG01N33/0047G01N33/0009Y02A50/20
Inventor 曾立武黄晓锋冯凝何凌燕
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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