CN106841372A

CN106841372A - It is a kind of to monitor NO in air simultaneouslyX、O3And SO2Method

Info

Publication number: CN106841372A
Application number: CN201510888470.0A
Authority: CN
Inventors: 李海洋; 彭丽英; 王祯鑫; 陈创; 蒋丹丹; 陈红
Original assignee: Dalian Institute of Chemical Physics of CAS
Current assignee: Dalian Institute of Chemical Physics of CAS
Priority date: 2015-12-07
Filing date: 2015-12-07
Publication date: 2017-06-13

Abstract

The invention discloses a kind of air pollution monitoring thing NO simultaneously_X、O₃And SO₂Method.The method is based on Ion mobility spectrometry, by automatic Sampling techniques, realizes real-time sample introduction and the monitoring of determinand, after realize identification each other with analysis according to the mobility difference of these three materials.

Description

In a kind of air of monitoring simultaneously NOX 、 O3 With SO2 Method

Technical field

The present invention relates toIn a kind of air of monitoring simultaneously NO_X 、 O₃ With SO₂ Method.Based on Ion mobility spectrometry, the automatic continued inlet and real-time monitoring of sample are realized using air pump, draw corresponding ion mobility spectrometryFigure, three kinds of qualitative analyses of material are realized finally according to transit time or mobility difference.

Background technology

Air pollutants are often referred to enter foreign substance near the ground or lower atmosphere layer environment in a gaseous form.It generally includes nitrogen oxides NO_X, sulfide such as SO₂With ozone O₃。NO_X、O₃And SO₂Three is that air quality monitoring must survey project, the quality of the height direct reaction air quality of their contents.Three kinds of methods of these three material demands and instrument are detected at present, and they are respectively：Chemoluminescence method, pulse ultraviolet fluorescence method and Ultraviolet Photometric Method.Although these three methods are widely used, wretched insufficiency is there is also.As NOx analyzers need O₃Generator, NOx need to be reduced to NO before measurement, and the selection of luminescence reagent has limitation, response time about 60s more long；O₃The ultraviolet source service life that analyzer is used is limited, and the response time is about 30s；SO₂Analyzer is then that light source service life is limited, and the response time is more long, about 90s.Therefore, a kind of inexorable trend that another quick and energy real-time detection method is air pollution present situation is developed.

The content of the invention

The present invention relates toIn a kind of air of monitoring simultaneously NO_X 、 O₃ With SO₂ Method.Based on Ion mobility spectrometry, the automatic continued inlet and real-time monitoring of sample are realized using air pump, draw corresponding ion mobility spectrometryFigure, three kinds of separation analyses of material are realized finally according to transit time or mobility difference.

The technical solution adopted by the present invention is as follows：

Under the air-extraction function of air pump 2, sample from the automatic continued inlet of injection port 3 is realized, by the real-time monitoring of migration tube 4, obtain migration spectrumFigure 6.Analysis is identified according to three kinds of material itself transit time differences.

Advantages of the present invention is as follows：

1. air pump air-extraction function automatic continuous sampling is utilized, real-time continuous monitoring is capable of achieving.

2. the device is simple, easy to operate, low cost.

3. instrument service condition is simple, can long-time steady operation.

4. ion mobility spectrometry portable instrument easy of integration, can be applied to vehicle-mounted, and the place such as monitoring station carries out detection air quality for a long time.

Brief description of the drawings

Figure 1For the experimental provision for detectingFigure；

Figure 2The NO that long-time continuous monitoring outdoor air is obtained_X、O₃And SO₂Monitoring curve；

Specific embodiment

Such as Figure 1It is shown：The experimental provision and detection process of the method be：The bond quality flowmeter coutroi velocity in the presence of air pump 2 of gas (discharge gas) 1, is about 900mL/min in experiment；Drift gas 5 under mass flowmenter control, flow speed stability in 600mL/min, now to keep in migration tube 4 air pressure constant and close to atmospheric pressure, injection port 3 then can continuous sample introduction, sample introduction flow velocity is about 300mL/min.Continuous sample introduction is realized under air pump effect, sample enters migration tube, by⁶³Ni ionization sources are ionized into gas ion, and gas ion, because mobility difference is realized separating analysis, finally gives migration spectrum in migration tube migration areaFigure, the transit time or mobility of respective substance can be obtained from migration spectrum.

Embodiment 1

Using the method continuous acquisition outdoor air, sample detection, and obtain NO_X、O₃And SO₂The monitoring curve of three,As schemed 2It is shown.Result understands the ability that there is the method long-time stable to monitor.

Claims

1. it is a kind of to monitor NO in air simultaneously_X、O₃And SO₂Method：Based on Ion mobility spectrometry, by using automatic Sampling techniques, the automatic continued inlet of sample, and real-time monitoring are realized, draw migration spectrogram, three kinds of separation identifications of material, and qualitative analysis are realized finally according to transit time or mobility difference.

2. method according to claim 1, it is characterised in that：Realize that real-time continuous are monitored using Ion mobility spectrometry and with reference to auto injection structure.

3. method according to claim 1, it is characterised in that：Detection obtains NO_X、O₃And SO₂The ion transfer spectrogram of three, the ionic mobility difference according to three realizes the identification and analysis of three.

4. method according to claim 2, it is characterised in that：The automatic Sampling techniques refer to add an air pump by ion mobility spectrometry gas outlet, drift gas is controlled to enter the gas flow rate that the speed and air pump of transference tube are evacuated in gas outlet simultaneously, so that pumping flow velocity of the drift gas velocity less than air pump, cause in migration tube in negative pressure state, realize sample from the injection port of transference tube to the automatic continued inlet in transference tube.

5. method according to claim 3, it is characterised in that：NO_X、O₃And SO₂The mobility of three is variant, and under the conditions of temperature, drift gas velocity, the pumping flow velocity of air pump in stabilization, the mobility of three determines substantially, by NO_X、O₃And SO₂The standard sample of three is demarcated, and can realize qualitative analysis according to the mobility difference of three.

6. according to the method described in claim 3, it is characterised in that:NO_XIncluding NO and NO₂。

7. method according to claim 5, it is characterised in that：When migration tube temperature is 90 DEG C, when drift gas velocity and pumping gas velocity are 600 and 900mL/min, sample introduction flow velocity is 300mL/min；With this understanding, NO_X、O₃And SO₂Transit time be respectively 5.45,5.82 and 6.45ms, mobility is respectively 2.64,2.47 and 2.23cm²V^-1s^-1。