CN101126686B - Tube type pump-free type samplers - Google Patents
Tube type pump-free type samplers Download PDFInfo
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- CN101126686B CN101126686B CN2007101132173A CN200710113217A CN101126686B CN 101126686 B CN101126686 B CN 101126686B CN 2007101132173 A CN2007101132173 A CN 2007101132173A CN 200710113217 A CN200710113217 A CN 200710113217A CN 101126686 B CN101126686 B CN 101126686B
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- anemostat
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- diffusion tube
- convex ring
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Abstract
The utility model relates to a sampler, in particular to a tube non-pump sampler, aiming at providing a tube non-pump sampler with compact size, simple and convenient operation, safety and reliability. The utility model adopts the technical proposal of comprising a sleeve, an diffusion tube, a copper net and an activate carbon; wherein, the copper net is lined internally inside the diffusion tube; the activated carbon is filled inside the copper net; the diffusion tube is closed at one end and an diffusion tube cover is arranged at the other end; the diffusion tube is sleeved inside the sleeve which is closed at one end; a locating convex ring is arranged at both ends of the diffusion tube; a locating convex ring cooperated with the locating convex ring of the diffusion tube is arranged at unclosed end of the sleeve; expansion holes are evenly arranged on the diffusion tube. The utility model has the advantages of meeting good result in sampling ratio, absorption capacity and sample stability and other performances and providing wide prospect for application fields such as environment monitoring, occupational health and sanitation and anti-epidemic station for giant potential in miniaturization, economization and portability.
Description
Technical field
The present invention relates to a kind of sampling thief, be specially a kind of tube type pump-free type samplers.
Background technology
A kind of instrument that the present content of measuring benzene in air ethene, benzene,toluene,xylene etc. generally uses is active sampling thief, pump formula sampling thief is promptly arranged, gather gaseous state or steam-like pollutant in the solvent by the power of bleeding, its advantage is: the content that can measure chemical substance in the air of certain volume accurately; Its shortcoming is: the sampling that is not suitable for continuously long-time (8h); Need aspiration pump as bleeding power, need to consume certain power supply; Volume is big, carries inconvenience.
Existence just because of some shortcomings of active sampling thief, make people need develop a kind of novel sampling instrument and overcome above shortcoming, and this novel sampling thief requires to have power, easy portable, can sample for a long time (8h), the characteristics easy and simple to handle of not needing, the passive type sampling has exactly met so a kind of trend, a kind of method of sampling that it gathers gaseous state in the solvent or steam-like pollutant based on molecular diffusion principle or penetration theory, this sampling thief have that volume is little, light weight, easy and simple to handle, easy care and safe and reliable characteristics.
Its ultimate principle is according to the Fick diffusion law, material molecule moves along concentration gradient in air, promptly spread to low concentration by high concentration, its mass transfer speed is directly proportional with the sectional area of concentration gradient, molecular diffusivity and the diffusion layer of material, is inversely proportional to the length of diffusion layer.
Summary of the invention
The object of the present invention is to provide that a kind of volume is little, light weight, easy and simple to handle, easy care and safe and reliable tube type pump-free type samplers.
In order better to realize the object of the invention, the inventor has carried out conscientiously research to tube type pump-free type samplers:
Research method (is example with styrene) is as follows:
(1) instrument and reagent: Tianjin, island 2010 gas chromatographs, micro syringe, gas sampler, tube type pump-free type samplers, wind gage, Hygrothermograph, carbon disulphide (is analyzed pure, the China Chengdu Long Huagongshijichang of section), styrene (chromatographically pure, U.S. New Jersey company).
(2) preparation of gas in the gas holder: the distribution cabinet is a toxicology gas exposure cabinet, and composition is a vinyon, is shaped as the structure of column, the high 1.5m of post, and diameter 1.0m, volume are 1.2m
3In the distribution cabinet, add a certain amount of styrene liquid, after heated volatile is complete, in the distribution cabinet, form certain density styrene gas, respectively at 1,2,4,6,8h takes out 100ml gas and measures, according to the gas concentration typical curve calculate 1,2,4,6, during 8h in the gas holder gas mean concentration be respectively 196.5,203.2,198.6,205.2,195.3mg/m
3, the result shows that styrene gas concentration is along with the not variation of prolongation of time in the gas holder.
(3) performance evaluation of sampling thief: in the distribution cabinet, prepare after the certain density gas, sampling thief is taken out from sealing bag, diffusion layer is partly stretched out shell be exposed to air, put into the distribution cabinet, environmental baselines such as record temperature, humidity, wind speed, after exposing a period of time, regain sampling thief,, put into sealing bag and preserve sealing and fixing in the adsorbed layer part indentation shell, and the record sampling time, sample is delivered to lab analysis.
(4) cinnamic mensuration: after the sampling, open the sampling thief bonnet, activated charcoal is poured in the 10ml test tube with ground stopper, add the carbon disulphide of 2ml, 30 ℃ of ultrasonic desorb 30min get stripping liquid 1 μ l gas chromatography and analyze.
1, thickness of diffusion layer and diffusion layer area determines
Design passive type sampling thief is measured the content of benzene in air ethene, the cinnamic index of correlation of will seeking knowledge, promptly cinnamic coefficient of diffusion (D): 7.01cm
2/ s, and the computing formula of the area of diffusion layer (A=spreads hole count * single hole area), the thickness (L) of diffusion layer in addition.Therefore, in specific design, D, L make it satisfy following the requirement: theoretical sampling flow=DA/L 〉=25ml/s, that is: require ratio 〉=3.57 of A/L, in the design sampling thief, as long as we have determined thickness or area, just can determine the another one factor, it is best that both suitable resize ratios reach.
The about 200mg/m of preparation in the orchestration cabinet
3Calibrating gas, put into 6 sampling thiefs and 6 sampling thiefs that diffusion area reduces by half, sample and take out after 4 hours, measure according to above-mentioned research method, the material mass of the normal sampling thief absorption of result is 3.22mg, the material mass of the sampling thief absorption that diffusion area reduces by half is 1.67mg, the area that diffusion layer has been described is having bigger effect aspect the adsorptive power of decision sampling thief, therefore will notice guaranteeing that the area of diffusion layer can satisfy the requirement of the sampling flow of passive type sampling thief in design.
Final definite anemostat thickness is 0.15cm, and the quantity of diffusion hole is 100, and the single hole diameter is 0.1cm.
2, the selection of adsorbent
Desirable solid adsorbent should have excellent mechanical intensity, stable physicochemical property, enough strong adsorptive power, desorb and the low characteristics of price easily.The suction-operated of solid adsorbent, a kind of is physical property absorption, by intermolecular acting force, but adsorbability a little less than, easily under physical factor, make the molecule desorb of absorption.Another kind is a chemisorption, and what lean on is the affinity effect of chemistry, and adsorbability is stronger, is difficult for desorb under the effect of physical factor.Adsorbent commonly used mainly contains acticarbon, silica gel and porous polymer bead etc., and these materials not only have big outside surface, and also has bigger inside surface.
Acticarbon belongs to non-polar adsorbent, adsorb nonpolar and organic gas and steam low pole, and adsorption capacity is big, high adsorption capacity, planar water seldom and has been adsorbed a spot of water and also can not influenced its ability, and the water of absorption also can be replaced by nonpolar and material low pole, therefore, acticarbon is well suited for gathering organic gas and steam mixture.Styrene belongs to nonpolar organic gas, and we select acticarbon according to the above, as cinnamic adsorbent.We select activated charcoal as adsorbent, will consider some factors of activated charcoal: are how many orders of grain size of (1) activated charcoal suitable? (2) how many milligrams of the amount of activated charcoal? the particle of activated charcoal is more little, the surface area of the activated charcoal of same quality is big more, adsorption efficiency is high more, but it makes difficulty, and the quantity of activated charcoal is The more the better, but what bring simultaneously is that the difficulty and the volume of desorb is too big, be difficult for realizing portable advantage, so we to consider these problems in design.
(1) determining of activated carbon granule size: the about 200mg/m of preparation in the orchestration cabinet
3Calibrating gas, putting into 6 sampling thief dress 0.7g grain sizes is that 2.0-3.0mm activated charcoal and 6 dress 0.7g grain sizes are the 0.4-0.8mm activated charcoal, sample and take out after 4 hours, measure according to above-mentioned research method, the material mass of the sampling thief of 2.0-3.0mm absorption as a result is 2.35mg, 0.4-0.8mm the material mass of sampling thief absorption be 3.15mg, illustrated that the adsorptive power of the activated charcoal that particle is little is stronger, this sampling thief uses diameter 0.4-0.8mm activated charcoal to be adsorbent.
(2) determining of amount of activated carbon: the about 200mg/m of preparation in the orchestration cabinet
3Calibrating gas, putting into 6 sampling thief dress 0.7g grain sizes is that 0.4-0.8mm activated charcoal and 6 dress 0.5g grain sizes are the 0.4-0.8mm activated charcoal, sample and take out after 4 hours, measure according to above-mentioned research method, the material mass of dress 0.7g sampling thief absorption is 3.18mg in the result, the material mass of interior dress 0.5g sampling thief absorption is 3.06mg, the sampling flow not influence of the quantity of activated charcoal for sampling thief has been described, but to high concentration gas, activated charcoal often easily reaches capacity influences adsorption capacity, so this sampling thief uses the 0.7g activated charcoal.
Final definite activated carbon granule size is 0.4-0.8mm, totally 0.7 gram.
Concrete technical scheme of the present invention is: tube type pump-free type samplers, it is by sleeve, anemostat, as the copper mesh of the layer that keeps out the wind, form as the activated charcoal of adsorbent, be lining in the anemostat in the copper mesh, activated charcoal is filled in the copper mesh, the sealing of anemostat one end, the other end are provided with the anemostat lid, and anemostat be packed, be poured out to activated charcoal can into by the anemostat lid, be easy to change, so that the sampling thief recycling; In the sleeve that the anemostat suit at one end seals, the anemostat two ends are provided with the anemostat positioning convex ring, be provided with the sleeve positioning convex ring that matches with the anemostat positioning convex ring in the untight end of sleeve, when anemostat is stretched out sleeve, the anemostat positioning convex ring that is positioned at the sleeve inner end matches with the sleeve positioning convex ring, and the two difficult drop-off is when pushing sleeve with anemostat, the anemostat positioning convex ring that is positioned at the sleeve outer end matches with the sleeve positioning convex ring, and sealing is preserved; Evenly be provided with diffusion hole on the anemostat.
Ratio 〉=3.57 of the total area of described diffusion hole/anemostat thickness.
Be ratio 〉=3.57 of the total area/anemostat thickness of realizing diffusion hole, described anemostat thickness is 0.15cm, and the quantity of diffusion hole is 100, and the single hole diameter is 0.1cm.
Described copper mesh is one deck 200 purpose copper mesh, and its function has 2, the one, play preventing that adsorbent from leaking outside, and because the diameter of diffusion hole is excessive, adsorbent is easy to spill, and the existence of copper mesh can be played the effect that spills of preventing; The 2nd, when the wind speed in the external environment is excessive, can play preventing that air-flow from mediating, reduce that air-flow is mediated and the sampling that causes is inaccurate.
Described activated carbon granule size is 0.4-0.8mm.
Above-mentioned activated charcoal is 0.7 gram.
In 120 ℃ of baking ovens, pyroprocessing 2 hours was to remove the material of charcoal absorption before above-mentioned activated charcoal was installed.
For making the present invention be easy to fixing the use, sleeve is provided with geometrical clamp.
Above-mentioned sleeve, anemostat are made by polythene material.
Beneficial effect of the present invention is: indexs such as sampling rate of the present invention, adsorption capacity, sample stability can both reach good effect; The great potential of the present invention aspect microminiaturization, energy-conservationization and portability is for its application in various fields such as environmental monitoring, occupational health, health and epidemic preventions provides wide prospect.
Description of drawings
Fig. 1 is an embodiment of the invention open mode synoptic diagram;
Fig. 2 is an embodiment of the invention open mode cut-open view;
Fig. 3 is an embodiment of the invention closed state cut-open view;
Wherein, 1, sleeve, 2, anemostat, 3, copper mesh, 4, diffusion hole, 5, activated charcoal, 6, the anemostat positioning convex ring, 7, the sleeve positioning convex ring, 8, the anemostat lid, 9, geometrical clamp.
Embodiment
As shown in the figure, tube type pump-free type samplers, it is by sleeve 1, anemostat 2, as the copper mesh 3 of the layer that keeps out the wind, form as the activated charcoal 5 of adsorbent, be lining in the copper mesh 3 in the anemostat 2, activated charcoal 5 is filled in the copper mesh 3, the sealing of anemostat 2 one ends, the other end is provided with anemostat lid 8, in the sleeve 1 that anemostat 2 suits at one end seal, anemostat 2 two ends are provided with anemostat positioning convex ring 6, be provided with the sleeve positioning convex ring 7 that matches with anemostat positioning convex ring 6 in the sleeve 1 untight end, evenly be provided with diffusion hole 4 on the anemostat 2.
Be ratio 〉=3.57 of the total area/anemostat 2 thickness of making diffusion hole 4, anemostat 2 thickness of the present invention are decided to be 0.15cm, and the quantity of diffusion hole 4 is 100, and the single hole diameter is 0.1cm.
During use, unpack at the scene, the anemostat 2 of tube type pump-free type samplers is stretched out sleeve 1, the anemostat positioning convex ring 6 that is positioned at sleeve 1 inner end matches with sleeve positioning convex ring 7, the two difficult drop-off, sampling thief is sampled on every side with the breathing zone that geometrical clamp 9 is fixed in the workman, write down sampling time, environmental baseline, work post etc. simultaneously, after finishing, sampling regains, anemostat 2 is pushed in the sleeve 1, the anemostat positioning convex ring 6 that is positioned at the sleeve outer end matches with sleeve positioning convex ring 7, and sealing is preserved, and brings back lab analysis and measures.
The present invention also can be placed in the fixed location to workshop condition or indoorly carry out air quality monitoring.
The present invention and pump formula sampling thief sample effect contrast is arranged:
At the styrene scene, at first environmental baseline is measured: temperature: 18 ℃, standard atmospheric pressure, relative humidity 42%, wind speed 280cm/s, select 2 different contact places, 6 sampling thiefs of the present invention and 6 are placed in each place the pump sampling thief, sampling was fetched mensuration after 8 hours in the workplace, according to the concentration of concentration of styrene in gas concentration=stripping liquid * stripping liquid volume/sampling flow * benzene in air ethene that sampling time calculating records, contact place the present invention and the concentration average that has the pump sampling thief to measure are respectively 73.66 ± 4.68,71.07 ± 3.97mg/m
3, another place concentration average is respectively 30.27 ± 1.92,31.15 ± 1.74mg/m
3, two groups of results are carried out t check, P value is respectively 0.325,0.424, shows the present invention and the measurement result there was no significant difference of pump formula sampling thief is arranged, the application of suitable actual field.
In the practice, measure the content of benzene in air, toluene, dimethylbenzene and the measurement result there was no significant difference of pump formula sampling thief is arranged, be fit to the application of actual field with the present invention.
Claims (9)
1. tube type pump-free type samplers, it is by sleeve (1), anemostat (2), as the copper mesh (3) of the layer that keeps out the wind, form as the activated charcoal (5) of adsorbent, be lining in the copper mesh (3) in the anemostat (2), activated charcoal (5) is filled in the copper mesh (3), it is characterized in that, the sealing of anemostat (2) one ends, the other end is provided with anemostat lid (8); In the sleeve (1) that anemostat (2) suit at one end seals, anemostat (2) two ends are provided with anemostat positioning convex ring (6), are provided with the sleeve positioning convex ring (7) that matches with anemostat positioning convex ring (6) in the untight end of sleeve (1); Evenly be provided with diffusion hole (4) on the anemostat (2).
2. tube type pump-free type samplers according to claim 1, ratio 〉=3.57 of the total area of described diffusion hole (4) and anemostat (2) thickness.
3. tube type pump-free type samplers according to claim 1 and 2, described anemostat (2) thickness is 0.15cm, and the quantity of diffusion hole (4) is 100, and the single hole diameter is 0.1cm.
4. tube type pump-free type samplers according to claim 1, described copper mesh (3) are one deck 200 purpose copper mesh.
5. tube type pump-free type samplers according to claim 1, described activated charcoal (5) grain size is 0.4-0.8mm.
6. tube type pump-free type samplers according to claim 1 or 5, described activated charcoal (5) is 0.7 gram.
7. tube type pump-free type samplers according to claim 1 or 5, before described activated charcoal (5) is installed in 120 ℃ of baking ovens, pyroprocessing 2 hours.
8. tube type pump-free type samplers according to claim 1, described sleeve (1) is provided with geometrical clamp (9).
9. according to claim 1 or 2 or 8 described tube type pump-free type samplers, described sleeve (1), anemostat (2) are made by polythene material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101132173A CN101126686B (en) | 2007-09-29 | 2007-09-29 | Tube type pump-free type samplers |
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| CN2007101132173A CN101126686B (en) | 2007-09-29 | 2007-09-29 | Tube type pump-free type samplers |
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| CN101126686A CN101126686A (en) | 2008-02-20 |
| CN101126686B true CN101126686B (en) | 2011-03-16 |
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| CN101852691B (en) * | 2010-04-30 | 2013-07-24 | 清华大学 | Passive adsorbing and sampling device for detecting concentration of volatile contaminant in indoor air |
| CN101852692A (en) * | 2010-04-30 | 2010-10-06 | 清华大学 | Passive filling adsorption sampling device for air volatile contaminant concentration detection |
| EP2733475A1 (en) * | 2012-11-14 | 2014-05-21 | The European Union, represented by the European Commission | Diffusive sampling device |
| CN103398878B (en) * | 2013-08-15 | 2015-08-19 | 深圳市建筑科学研究院股份有限公司 | A kind of passive type air sampler |
| CN103926116B (en) * | 2014-04-29 | 2017-01-11 | 深圳市建筑科学研究院股份有限公司 | Sampling core for air sampler |
| CN104181012B (en) * | 2014-08-25 | 2016-08-31 | 深圳市建筑科学研究院股份有限公司 | A kind of air sampler |
| CN104458353A (en) * | 2014-12-26 | 2015-03-25 | 广东汉卫检测科技有限公司 | Wearable volatile organic gas diffusion sampling pipe |
| CN105928834A (en) * | 2015-09-14 | 2016-09-07 | （新福佳）澳大利亚环境科技有限公司 | Passive mass flux measurement method and measuring instrument |
| CN107201898A (en) * | 2016-03-18 | 2017-09-26 | 中国石油化工股份有限公司 | A kind of adsorption structure and its manufacture method for stratum |
| CN106908284A (en) * | 2017-03-27 | 2017-06-30 | 中国安全生产科学研究院 | A kind of pump-free type samplers gathered for benzene in air, toluene |
| CN107656035B (en) * | 2017-11-13 | 2024-04-02 | 中国科学院武汉岩土力学研究所 | Permeation and humidity diffusion test device |
| CN108414295B (en) * | 2018-03-07 | 2021-06-29 | 广东诺瓦安评检测有限公司 | Sampling device and sampling method for industrial enzyme mixed dust in air of workplace |
| CN108985651A (en) * | 2018-07-04 | 2018-12-11 | 码路（海南）人工智能有限公司 | Product quality supervision by the public method and supervision by the public product |
| CN110646250B (en) * | 2019-08-22 | 2022-06-17 | 湖南国康检验检测技术有限公司 | Sampling device for environment detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100596A (en) * | 1985-04-01 | 1986-08-20 | 冶金部安全技术研究所 | Mercury vapor passive sampler |
| CN1492223A (en) * | 2003-09-29 | 2004-04-28 | 中国疾病预防控制中心环境与健康相关 | Solid phase adsorption air pollutant sampler and its producing method |
| EP1655594A1 (en) * | 2004-11-08 | 2006-05-10 | Vlaamse Instelling Voor Technologisch Onderzoek (Vito) | Diffusive sampling device |
-
2007
- 2007-09-29 CN CN2007101132173A patent/CN101126686B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100596A (en) * | 1985-04-01 | 1986-08-20 | 冶金部安全技术研究所 | Mercury vapor passive sampler |
| CN1492223A (en) * | 2003-09-29 | 2004-04-28 | 中国疾病预防控制中心环境与健康相关 | Solid phase adsorption air pollutant sampler and its producing method |
| EP1655594A1 (en) * | 2004-11-08 | 2006-05-10 | Vlaamse Instelling Voor Technologisch Onderzoek (Vito) | Diffusive sampling device |
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