CN106706366A - Water sampling sponge - Google Patents
Water sampling sponge Download PDFInfo
- Publication number
- CN106706366A CN106706366A CN201611244864.3A CN201611244864A CN106706366A CN 106706366 A CN106706366 A CN 106706366A CN 201611244864 A CN201611244864 A CN 201611244864A CN 106706366 A CN106706366 A CN 106706366A
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- China
- Prior art keywords
- sponge
- microns
- sampling
- water
- main body
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses water sampling sponge which comprises a sponge main body with a pore structure and molecular sieve powder attached to the surface of the pore structure of the sponge main body. A molecular sieve is organically combined with the sponge main body, so that the water sampling detection difficulty is reduced, a water sample does not need to be directly carried, the carrying convenience is improved, and the water sampling and transporting convenience is improved.
Description
Technical field
The present invention relates to a kind of water pollution sampling media, particularly a kind of water body sampling sponge.
Background technology
Water (H2O) inorganic matter being made up of hydrogen, two kinds of elements of oxygen, is at normal temperatures and pressures the transparent liquid of colorless and odorless
Body, including natural water (river, lake, atmospheric water, seawater, underground water etc.), manually water processed (makes hydrogen-oxygen atom by chemical reaction
With reference to obtaining water).Water is one of most common material, is the valuable source of all life existence including humans, is also raw
The most important part of object.Water plays an important role in Life Evolution.Water be people life production in can not
Or a scarce part, although and water is a kind of renewable resource, its its quantity available in special time period is limited.
The activity of the mankind can be such that substantial amounts of industry, agricultural and domestic refuse enters in water, be contaminated water.At present,
The sewage that the whole world there are about billion cubic meter more than 4200 every year enters rivers,lakes and seas, pollutes the fresh water of 5.5 tcms, this phase
When in more than the 14% of global runoff volume.Promulgate within 1984《Law of the People's Republic of China on the Prevention and Control of Water Pollution》In for " water is dirty
Dye " has descended clear and definite definition, i.e. water body because of the intervention of certain material, and causes the side such as its chemistry, physics, biology or radioactivity
The change of region feature, so as to influence effective utilization of water, is detrimental to health or destroys ecological environment, causes water quality deterioration
Phenomenon is referred to as water pollution (Water Pollution).
Waste water has different sorting techniques from different perspectives.It is divided into sanitary wastewater according to separate sources and industrial wastewater two is big
Class；Chemical classes according to pollutant can divide inorganic wastewater and organic wastewater again；Also there is by industrial department or produces the production of waste water
Technique classification, such as coking chemical waste water, Metallurgical Waste Water, pharmacy waste water, food wastewater.
Pollutant mainly has：
(1) it is unprocessed and discharge industrial wastewater；
(2) it is unprocessed and discharge sanitary sewage；
(3) chemical fertilizer, agricultural chemicals, herbicide and the farmland sewage that causes largely are used；
(4) trade waste and house refuse by the river is stacked；
(5) deforestation, soil erosion；
(6) because of exhaustive exploitation, mine system engineering is produced.
Wherein heavy metal pollution, Organic Pollution (such as nitrogen, phosphorus organic matter etc.) etc. are maximum to environment and mankind's harm
Pollute and relatively common.Heavy metal pollution, refers to the environment dirt caused by the heavy metals such as copper, lead, mercury, cadmium, cobalt or its compound
Dye, mainly caused by mining, waste gas discharge, sewage irrigation and using huge sum of money metal products et al. for factor.Heavy metal have be difficult
The characteristic of mobile dissolving, into organism after can not be discharged and degrade, slow poisoning can be caused.Heavy Metal Pollution degree depends on
Species, concentration, physicochemical property, the valence state for existing and form in element.The meeting when the concentration of metallic element exceedes a certain numerical value
There is violent toxicity, cause animals and plants to be poisoned, in addition it is dead.
Heavy metal is widely distributed in air, water body, soil, organism, is mainly manifested in water pollution.A huge sum of money in water
There are trade effluent and agricultural chemicals in category source, and because bed mud has filtration, therefore the often pooling zone of heavy metal.Work as environment
During change, the Heavy Metals in bed mud will also be converted and discharged and pollute.Heavy metal in water body, even if dense
Degree is very low, can also be accumulated in algae and bed mud, is adsorbed by fish and shellfish body surface, produces food chain concentration.Heavy metal can pass through
Food chain enters enrichment in human body, and human health is had a strong impact on by its carcinogenicity, mutagenicity, cytotoxicity.It is heavy metal-polluted
Dye wide material sources, wherein considerable part are that the waste gas that is produced by mankind's activity, waste water, waste residue enter environment, are polluted.
And in order to protect water body to be accomplished by carrying out sample detecting monitoring to its state.Water pollution is sampled, and is related to water
The monitoring of body water quality and water body health status, and the sampling of existing water body is directly filled with sampling bottle when small lot is sampled
Dress sample segment, is tested and analyzed at then transport to testing equipment, and the water during this in sample occupies big portion
Divide hauled weight；And the systems such as special sampling conveyance conduit and pumping plant can be then set up during the sampling for a long time of high-volume long range, this
Water body sampling extremely inconvenience is allowed for, and significantly increases sampling cost.
The content of the invention
To solve the above problems, the invention discloses a kind of water body sampling sponge, have with sponge main body by by molecular sieve
Machine is combined, and both have preferable binding ability, so as to reduce the difficulty of water body sample detecting, without directly carrying water body sample
Product, so as to improve the convenience of carrying, lifting water body is sampled, the convenience of transport, and difficult for drop-off in long-term use,
And it is easy to recycling.
Water body disclosed by the invention is sampled sponge, including the sponge main body with pore structure and is attached to sponge main body
The molecular sieve powder on pore structure surface (surface includes main body top layer and pore structure surface).Molecule on sampling sponge products
Sieve its at least part surface micropore not shielded.
This programme is bound tightly together by by the molecular sieve of the powder morphology of high adsorption capacity with sponge main body, makes
Molecular sieve powder is in the top layer " taking root " of sponge main body, so that it is effectively fully adsorbed in its outstanding adsorptivity of performance
In water body example.Can be realized by the control to molecular sieve bore diameter simultaneously particularly special to the water pollutant of specified particle diameter
Determine the sampling of the pollution particle of particle diameter, realize the selectivity collection of sampled targets, such as free heavy metal ion, heavy metal complexing
Ion, red algae, blue-green algae etc..
A kind of improvement of water body sampling sponge disclosed by the invention, molecular sieve powder is uniformly dispersed and is consolidated in sponge master
The pore structure surface of body.
Molecular sieve is formed at this programme the surface of sponge main body, reduces the wave that resulted in blockage because of blocking for material of main part
Take, to improve its utilization ratio, and be easy to the regeneration of molecular sieve and the De contamination of adsorbate and detection in later stage use.
The a kind of of water body sampling sponge disclosed by the invention improves, and attachment quality of the molecular sieve powder in sponge main body is
The 0.1-10% of sponge main quality.
A kind of improvement of water body sampling sponge disclosed by the invention, molecular sieve powder particle diameter is 1 micron of -2mm.
A kind of improvement of water body sampling sponge disclosed by the invention, the material of sponge main body is that bubble rubber or polyether-type are poly-
Urethane or PAUR.
A kind of improvement of water body sampling sponge disclosed by the invention, the hole size of the pore structure of sponge main body is 2-4mm.This
Scheme the enhancing when being sampled to water body is to the circulation of water and filters ability, and can reduce non-targeted by providing holes size
Influence of the impurity to sampling is even damaged to the structure of sponge, while may be such that sponge has in unit volume again
Good empty density, so as to ensure there is its good ability in sampling, and reduces error probability.
A kind of improvement of water body sampling sponge disclosed by the invention, surface tension of the sponge main body under 25 degrees Celsius is little
In 72mN/m.This programme makes it below the surface tension of water, so as to not only make by limiting the surface tension of sponge main body
The attachment of debris or dirt is less prone in, while sampled targets can be avoided to promote sampling in the attachment of body surfaces
Sticking probability of the target in molecular sieve, so as to after sampling is completed, it is to avoid by extruding or extruding the timesharing of sponge reclaimed water not
Adsorbed sampled targets are excluded, and reduce sampling precision.
The present invention discloses water body sampling sponge, is organically combined by by molecular sieve and sponge, with the adsorption capacity of molecular sieve
To realize the enhancing to the adsorption sampling ability of target sample, sampling accuracy and sampling efficiency are improve, while by dividing
The control of sub- mesh size and type, realizes to the selective absorption of different type pollutant (such as suspension size, pollutant kind
Selection, the even selection of specific pollutants) so as to not only improve only unit volume sampling quality of adsorption and absorption imitate
Rate, while the binding ability between target sample (pollutant)-molecular sieve-sponge three is also enhanced, so as to avoid using
Middle generation sample or molecular sieve come off, and not only influence sampling efficiency, equally influence sampling precision.
Specific embodiment
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
The bright present invention rather than limitation the scope of the present invention.
In the present invention program sponge main body for include, without being limited to macropore sponge or pore sponge (various cellular rubbers,
Polyurethane sponge, polyethers sponge etc.)
Embodiment 1
The present embodiment water body sample sponge, including the sponge main body with pore structure and be attached to sponge main body hole knot
The molecular sieve powder on structure surface, include, without being limited to all or part of molecular sieve powder be distributed in sponge main body whole or
The situation of partial hole body structure surface.
Distinguished with above-described embodiment, molecular sieve powder is uniformly dispersed and is consolidated in the pore structure table of sponge main body
Face, includes, without being limited to be scattered in the situation on all or part of pore structure surface of sponge main body.
Distinguished with above-described embodiment, attachment quality of the molecular sieve powder in sponge main body is sponge main quality
0.1% (attachment quality of the molecular sieve powder in sponge main body account for sponge main quality ratio can also be include without limit
In following any：0.2%th, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%,
1.3%th, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%,
2.5%th, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%,
3.7%th, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%,
4.9%th, 5.0%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9%, 6.0%,
6.1%th, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9%, 7.0%, 7.1%, 7.2%,
7.3%th, 7.4%, 7.5%, 7.6%, 7.7%, 7.8%, 7.9%, 8.0%, 8.1%, 8.2%, 8.3%, 8.4%,
8.5%th, 8.6%, 8.7%, 8.8%, 8.9%, 9.0%, 9.1%, 9.2%, 9.3%, 9.4%, 9.5%, 9.6%,
9.7%th, other arbitrary values in the range of 9.8%, 9.9%, 10.0% and 0.1-10%).
Distinguished with above-described embodiment, molecular sieve powder particle diameter is 1 micron, and (molecular sieve powder particle diameter can also be to include
And be not limited to following any：1 micron, 2 microns, 3 microns, 4 microns, 5 microns, 6 microns, 7 microns, 8 microns, 9 microns, it is 10 micro-
Rice, 20 microns, 30 microns, 40 microns, 50 microns, 60 microns, 70 microns, 80 microns, 90 microns, 100 microns, 110 microns,
120 microns, 130 microns, 140 microns, 150 microns, 160 microns, 170 microns, 180 microns, 190 microns, 200 microns, it is 210 micro-
Rice, 220 microns, 230 microns, 240 microns, 250 microns, 260 microns, 270 microns, 280 microns, 290 microns, 300 microns,
310 microns, 320 microns, 330 microns, 340 microns, 350 microns, 360 microns, 370 microns, 380 microns, 390 microns, it is 400 micro-
Rice, 410 microns, 420 microns, 430 microns, 440 microns, 450 microns, 460 microns, 470 microns, 480 microns, 490 microns,
500 microns, 510 microns, 520 microns, 530 microns, 540 microns, 550 microns, 560 microns, 570 microns, 580 microns, it is 590 micro-
Rice, 600 microns, 610 microns, 620 microns, 630 microns, 640 microns, 650 microns, 660 microns, 670 microns, 680 microns,
690 microns, 700 microns, 710 microns, 720 microns, 730 microns, 740 microns, 750 microns, 760 microns, 770 microns, it is 780 micro-
Rice, 790 microns, 800 microns, 810 microns, 820 microns, 830 microns, 840 microns, 850 microns, 860 microns, 870 microns,
880 microns, 890 microns, 900 microns, 910 microns, 920 microns, 930 microns, 940 microns, 950 microns, 960 microns, it is 970 micro-
Rice, 980 microns, 990 microns, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm,
Other arbitrary values in the range of 2.0 millimeters and 1 micron of -2mm).
Distinguished with above-described embodiment, the material of sponge main body is bubble rubber or EU or polyester-type
Polyurethane, such as includes, without being limited to polyurethanes sponge, polyethers 330n, polyethers 4110, polyethers f6, polyethers f68, polyethers
220th, polyethers l64, polyethers l61, polyethers 210, combined polyether, polyethers l-62, polyethers 403, nitrile rubber cotton etc..
Distinguished with above-described embodiment, the hole size of the pore structure of sponge main body for 2mm (pore structure of sponge main body
Hole size can also be include, without being limited to it is following any：2.1mm、2.2mm、2.3mm、2.4mm、2.5mm、2.6mm、2.7mm、
2.8mm, 2.9mm, 3.0 millimeters, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0
Other arbitrary values in the range of millimeter and 2-4mm).
Distinguished with above-described embodiment, surface tension of the sponge main body under 25 degrees Celsius be not more than 72mN/m (sponges
Surface tension of the main body under 25 degrees Celsius can also be include, without being limited to it is following any：10mN/m、11mN/m、12mN/m、
13mN/m、14mN/m、15mN/m、16mN/m、17mN/m、18mN/m、19mN/m、20mN/m、21mN/m、22mN/m、23mN/m、
24mN/m、25mN/m、26mN/m、27mN/m、28mN/m、29mN/m、30mN/m、31mN/m、32mN/m、33mN/m、34mN/m、
35mN/m、36mN/m、37mN/m、38mN/m、39mN/m、40mN/m、41mN/m、42mN/m、43mN/m、44mN/m、45mN/m、
46mN/m、47mN/m、48mN/m、49mN/m、50mN/m、51mN/m、52mN/m、53mN/m、54mN/m、55mN/m、56mN/m、
57mN/m、58mN/m、59mN/m、60mN/m、61mN/m、62mN/m、63mN/m、64mN/m、65mN/m、66mN/m、67mN/m、
Other arbitrary values in the range of 68mN/m, 69mN/m, 70mN/m, 71mN/m and no more than 72mN/m).
Specific embodiment 1
In the present embodiment, from polyethers l61 raw materials, sponge aperture 2mm, 300 microns of potassium A (3A) molecular sieve powder of powder diameter
Body, is sampling sponge sample by foaming, and attachment quality of the molecular sieve powder on sample is to account for sponge main quality
0.25%.Sampled targets normality inland river Lead in Aqueous Solution, including dissociated ion and complex ion.Sponge is soaked in sampling box
Afterwards after 1 hour, take out, gently extruding removes moisture, takes back, and is detected after removing, water sample inspection is directly carried with sampling bottle
Survey standard as a comparison.
Sampled in Hainan sampled point with 10 sponge samples, sampling quantity average variance 4 is contrasted with standard monitoring value,
Sampling precision is 98%.
Sampled in Nantong sampled point with 10 sponge samples, sampling quantity average variance 6 is contrasted with standard monitoring value,
Sampling precision is 97%.
Sampled in Harbin sampled point with 10 sponge samples, sampling quantity average variance 5, with standard monitoring value pair
Than sampling precision is 98.4%.
Sampled in Nanjing great Chang sampled points with 10 sponge samples, sampling quantity average variance 4, with standard monitoring value pair
Than sampling precision is 96.5%.
Sampled in Urumchi sampled point with 10 sponge samples, sampling quantity average variance 6, with standard monitoring value pair
Than sampling precision is 99%.
Specific embodiment 2
In the present embodiment, from the raw material of polyethers 4110, sponge aperture 3mm, 300 microns of potassium A (3A) molecular sieves of powder diameter
Powder, is sampling sponge sample by foaming, and attachment quality of the molecular sieve powder on sample is to account for sponge main quality
0.75%.Dissociate cadmium ion in the water body of sampled targets normality inland river.Sponge after 1 hour, is taken out, gently after immersion in sampling box
Light extruding removes moisture, takes back, and is detected after removing, and water sample detection standard as a comparison is directly carried with sampling bottle.
Sampled in Hainan sampled point with 10 sponge samples, sampling quantity average variance 4.4, with standard monitoring value pair
Than sampling precision is 97%.
Sampled in Nantong sampled point with 10 sponge samples, sampling quantity average variance 6.2, with standard monitoring value pair
Than sampling precision is 98.7%.
Sampled in Harbin sampled point with 10 sponge samples, sampling quantity average variance 5.4, with standard monitoring value pair
Than sampling precision is 98.4%.
Sampled in Nanjing great Chang sampled points with 10 sponge samples, sampling quantity average variance 4.5, with standard monitoring value
Contrast, sampling precision is 97.5%.
Sampled in Urumchi sampled point with 10 sponge samples, sampling quantity average variance 6.1, with standard monitoring value
Contrast, sampling precision is 98.9%.
Specific embodiment 3
In the present embodiment, from polyurethanes sponge material, sponge aperture 4mm, 2 millimeters of average holes of potassium of powder diameter
The microsized zeolite powder of footpath 100, is sampling sponge sample by foaming, and attachment quality of the molecular sieve powder on sample is
Account for the 0.45% of sponge main quality.Dissociate cadmium ion in the water body of sampled targets normality inland river.Sponge is 1 after immersion in sampling box
After hour, take out, gently extruding removes moisture, takes back, and is detected after removing, water sample detection work is directly carried with sampling bottle
It is contrast standard.
Sampled in Hainan sampled point with 10 sponge samples, sampling quantity average variance 4.5, with standard monitoring value pair
Than sampling precision is 98.1%.
Sampled in Nantong sampled point with 10 sponge samples, sampling quantity average variance 6.1, with standard monitoring value pair
Than sampling precision is 97.9%.
Sampled in Harbin sampled point with 10 sponge samples, sampling quantity average variance 5.2, with standard monitoring value pair
Than sampling precision is 98.2%.
Sampled in Nanjing great Chang sampled points with 10 sponge samples, sampling quantity average variance 4.7, with standard monitoring value
Contrast, sampling precision is 97.5%.
Sampled in Urumchi sampled point with 10 sponge samples, sampling quantity average variance 6.5, with standard monitoring value
Contrast, sampling precision is 97.9%.
This place embodiment is in place of the claimed non-limit of technical scope midrange and in embodiment technology
The new technical scheme formed to the equal replacement of single or multiple technical characteristics in scheme, equally all in application claims
In the range of protection；Simultaneously the present invention program it is all enumerate or unrequited embodiment in, in the same embodiment each
Parameter is merely representative of an example (i.e. a kind of feasible scheme) of its technical scheme, and between parameters and in the absence of strict
Cooperation and qualified relation, wherein each parameter can be replaced mutually when stating and asking without prejudice to axiom and the present invention, special declaration
Except.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned technological means, also includes
Constituted technical scheme is combined by above technical characteristic.The above is specific embodiment of the invention, should be referred to
Go out, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some
Improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (8)
1. a kind of water body sampling sponge, including the sponge main body with pore structure and the pore structure surface of sponge main body is attached to
Molecular sieve powder.
2. water body according to claim 1 sampling sponge, it is characterised in that the molecular sieve powder is uniformly dispersed and consolidates
Tie in the pore structure surface of sponge main body.
3. water body according to claim 1 and 2 sampling sponge, it is characterised in that the molecular sieve powder is in sponge main body
On attachment quality for sponge main quality 0.1-10%.
4. water body according to claim 1 and 2 sampling sponge, it is characterised in that the molecular sieve powder particle diameter is 1 micro-
- 2 millimeters of rice.
5. water body according to claim 3 sampling sponge, it is characterised in that the molecular sieve powder particle diameter is 1 micron-
2mm。
6. water body according to claim 1 sampling sponge, it is characterised in that the material of the sponge main body is bipeltate
Or EU or PAUR.
7. water body according to claim 1 sampling sponge, it is characterised in that the hole size of the pore structure of the sponge main body
It is 2-4mm.
8. according to claim 1 or 6 or 7 water body sampling sponge, it is characterised in that the sponge main body is at 25 degrees Celsius
Under surface tension be not more than 72mN/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611244864.3A CN106706366A (en) | 2016-12-29 | 2016-12-29 | Water sampling sponge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611244864.3A CN106706366A (en) | 2016-12-29 | 2016-12-29 | Water sampling sponge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106706366A true CN106706366A (en) | 2017-05-24 |
Family
ID=58903927
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102241406A (en) * | 2010-05-11 | 2011-11-16 | 哈尔滨工业大学 | Carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions, and preparation method thereof |
| CN102329461A (en) * | 2011-10-10 | 2012-01-25 | 沈阳化工大学 | Ethylene propylene diene terpolymer sponge rubber and preparation method thereof |
| CN102504415A (en) * | 2011-10-10 | 2012-06-20 | 沈阳化工大学 | Light-colored microporous EPDM sponge rubber and preparation method thereof |
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| CN105903451A (en) * | 2016-05-09 | 2016-08-31 | 李迎春 | Heavy metal adsorption sponge as well as preparation method and use thereof |
-
2016
- 2016-12-29 CN CN201611244864.3A patent/CN106706366A/en not_active Withdrawn
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| CN102241406A (en) * | 2010-05-11 | 2011-11-16 | 哈尔滨工业大学 | Carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions, and preparation method thereof |
| CN102329461A (en) * | 2011-10-10 | 2012-01-25 | 沈阳化工大学 | Ethylene propylene diene terpolymer sponge rubber and preparation method thereof |
| CN102504415A (en) * | 2011-10-10 | 2012-06-20 | 沈阳化工大学 | Light-colored microporous EPDM sponge rubber and preparation method thereof |
| CN104688277A (en) * | 2013-12-10 | 2015-06-10 | 郑兆珉 | Clinical specimen sampling instrument and method thereof |
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Application publication date: 20170524 |