Peroxy acyl radical nitric acid lipid substance sampling system and detection method
A technology of peroxyacyl nitrate and sampling system, which is applied to measurement devices, preparation of test samples, instruments, etc., can solve problems such as detection difficulties, easy decomposition, and monitoring technical difficulties, and achieves convenient operation and adjustment of sampling time. Effect
Active Publication Date: 2010-09-15
PEKING UNIV
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Problems solved by technology
[0002] Peroxyacyl nitrates (RC(O)OONO 2 , PANs) (including peroxyacetyl nitrate (PAN)) is an important product of atmospheric photochemical pollution. There are difficulties: the concentration of PANs in the atmosphere is low, from the lowest few ppt to the highest tens of ppb; and it is easy to decompose when heated, and cannot be stored for a long time at room temperature, which brings difficulties to the detection
Although it is possible to inject samples after condensation and enrichment with liquid nitrogen, the operation is complicated and continuous monitoring is impossible, especially the research and development of online monitoring instruments is in a blank state
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[0030] Such as figure 2 The composition diagram of the sampling system for peroxyacyl nitrates is shown. In this embodiment, the sampling gas path used to transport air samples is connected with a sampling valve and a zero gas valve. The standard gas generation unit consists of a PANs input unit and The calibration valve is composed of the sampling valve, zero gas valve and calibration valve, all of which are electromagnetic three-way valves. 1 Into, the normally closed end of the injection valve NC 1 Connected to the input end of the degradation loop, the normally open end of the injection valve NO 1 Normally open NO with zero air valve 2 Connection; normally closed end of zero air valve NC 2 Connect with the output end of the degradation circuit, the common port COM of the zero gas valve 2 Normally closed end NC with calibration valve 3 Connection; common port COM of the calibration valve 3 Connect with the PANs input unit; the common terminal COM of the zero air valv...
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The invention relates to a sampling system and a detection method used for matters such as peroxyacetyl nitrates, comprising a sampling air passage used for transmitting air samples, a degradation circuit used for removing the matters such as peroxyacetyl nitrates, etc. in the air samples by a pyrogenation method, and zero air is gained after degradation; the invention also comprises a standard air generation unit used for gaining the standard air with different concentrations by mixing the zero air with the matters such as peroxyacetyl nitrates of different quantities, a detecting unit used for collecting the data of the zero air, standard air and the air sample and gaining the concentration of the matters such as the peroxyacetyl nitrates in the air sample; the detection method is controlled by time sequence, utilizes the air sample to carry out the on-line proving in the same system without using the zero air and automatically realizes the air sample detection according to the marked data. The sampling system and the detection method realize the integration of the system sampling program and the marking program and have convenient operation.
Description
technical field [0001] The invention relates to the field of environmental quality monitoring, in particular to a peroxyacyl nitrate substance sampling system and a detection method. Background technique [0002] Peroxyacyl nitrates (RC(O)OONO 2 , PANs) (including peroxyacetyl nitrate (PAN)) is an important product of atmospheric photochemical pollution. There are difficulties: the concentration of PANs in the atmosphere is low, ranging from a few ppt at the lowest to tens of ppb at the highest; and it is easy to decompose when heated, and cannot be stored for a long time at room temperature, which brings difficulties to the detection. Although it can be enriched by liquid nitrogen condensation and then injected, the operation is complicated and continuous monitoring is impossible, especially the research and development of online monitoring instruments is in a blank state. With the increasing number of motor vehicles in my country's cities, photochemical smog pollution is...
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IPC IPC(8): G01N1/28G01N30/20
Inventor 张剑波杨光曾立民王斌于雪娜
Owner PEKING UNIV