CN2551996Y - Disposable colorimetric fast measuring bag - Google Patents
Disposable colorimetric fast measuring bag Download PDFInfo
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- CN2551996Y CN2551996Y CN 02240397 CN02240397U CN2551996Y CN 2551996 Y CN2551996 Y CN 2551996Y CN 02240397 CN02240397 CN 02240397 CN 02240397 U CN02240397 U CN 02240397U CN 2551996 Y CN2551996 Y CN 2551996Y
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Abstract
The utility model discloses a disposable colorimetric fast measuring bag which comprises an overwrap and a series of tools sealed in the overwrap. The tools comprise one or more than one sample absorption treatment tube, one or more than one sampling tube, two reagent tubes, a colorimetric tube, three kinds of chromogenic agent such as acetylacetone, phenol reagent and AHMT, and a colorimetric card. The fast measuring bag respectively takes the known acetylacetone or phenol reagent or AHMT as the chromogenic agent so as to ensure that the measured product is reacted with the chromogenic agent through different sampling manners and produce colors in a plastic burette. Compared with the standard tone scale, the utility model can measure formaldehyde or sodium formaldehyde sulphoxylate in gas, liquid and solid samples with half fixed quantity. The utility model has sensitive and correct method and simple and convenient operation, thereby being suitable for the site fast measuring; the whole measuring is finished in plastic tube; not only the dosage of the samples and reagents are few, but the reagent also can be recycled by the plastic tube so as to prevent and reduce the secondary pollution.
Description
Technical field:
The utility model relates to on-the site analysis and detects articles for use, is specifically related to the new product of formaldehyde, sodium formaldehyde sulfoxylate content in a kind of disposable half-quantitative detection room air, textile, articles for washing, the middle formaldehyde of decorating and renovating material (wood-based plate, furniture, coating, tackifier, wallpaper, carpet) and food, drink, the pharmaceutical products.
Background technology:
Formaldehyde (HCHO) is commonly called as formaldehyde, wooden aldehyde, and we are the most familiar is the formalin that its 40% aqueous solution promptly often is used to do antiseptic.
Formaldehyde is of many uses.All to use formaldehyde in synthetic resin, surfactant, plastics, rubber, tanning, papermaking, dyestuff, pharmacy, agricultural chemicals, photographic film, explosive, building materials and sterilization, the stifling and anticorrosion process, we can say that formaldehyde is a many-side people in the chemical industry.Yet have too much of a good thing, surmount boundary, bring endless trouble in case use.The medical expert introduces, and content of formaldehyde exceeds standard in the air becomes one of inducement of breathing problem, blood disease, intestines problem and pregnant woman's miscarriage, and directly has a finger in every pie food service industry, more makes formaldehyde become our hard to guard against healthy killer.
Formaldehyde is a kind of colourless easily molten irritative gas, and formaldehyde gas can absorb through respiratory tract, and its aqueous solution " formalin " can absorb through alimentary canal.Modern scientific research shows, when indoor content is 0.1mg/m
3The time peculiar smell and sense of discomfort just arranged; 0.5mg/m
3Can stimulate eyes to cause sheds tears; 0.6mg/m
3Shi Yinqi throat discomfort or pain; Concentration is high again to cause nausea, vomit, cough, uncomfortable in chest, asthma even pulmonary emphysema; In air, reach 30mg/m
3The time can cause death at once.Long-term contact low dosage formaldehyde is (as 0.02mg/m
3) can cause chronic respiratory disease, women's paramenia, pregnancy syndrome, cause the reduction of neonate's physique, chromosome abnormality even cause nasopharyngeal carcinoma.The formaldehyde of high concentration is (as 0.1mg/m
3More than) all toxic to nervous system, immune system, liver etc.But it also exciting eye conjunctiva, respiratory mucosa and producing shed tears, runny nose, the conjunctivitis that causes, sphagitis, asthma, bronchitis and allergic disease.Formaldehyde also has teratogenesis, carcinogenesis.According to epidemiology survey, contact the people of formaldehyde for a long time, can cause nasal cavity, oral cavity, nasopharynx, throat, skin and gastral cancer.
Rongalite (NaHSO
2CH
2O2H
2O) be commonly called as sodium formaldehyde sulfoxylate, the white piece of solidity, white bulk or crystallization powder, water-soluble, comparatively stable when normal temperature, form sulphite at pyrolytic.In process, generate formaldehyde sulphite or SO
2, and strong reducing action is arranged, and be the bleaching agent that commercial production is used, human body is taken in 10g and is got final product the causing death.So making already, country in food, ban use of sodium formaldehyde sulfoxylate to make bleaching agent.
There is the following aspects in formaldehyde, rongalite source:
1, is used as the artificial boards such as scale board, core-board, medium density fibre board (MDF) and particieboard of interior decoration.Because formaldehyde has stronger adhesion, also have the sheet material hardness of reinforcement and insect protected, anti-corrosion function, so produce at present tackifier that wood-based plate uses with formaldehyde as the formaldehyde that has neither part nor lot in reaction residual in the Lauxite of principal ingredient, the sheet material towards periphery environment discharge, be the main body that forms formaldehyde in indoor air.
2, the furniture made from wood-based plate.Some producers use underproof sheet material for profit-push, cause formaldehyde to exceed standard.
3, the other kinds ornament materials that contains the formaldehyde composition and might distribute to the external world is as adherent cloth, wallpaper, chemical fibre carpet, polyfoam, paint, coating and articles for washing etc.
4, in order to prevent that textile from shrinking, dried the prolonging of fabric drawn together, adopt formaldehyde resin to handle more, when surpassing finite concentration from the free formaldehyde to skin of fiber, the people will produce allergic reaction dermatitis.
5, some illegal operators, in order to obtain sudden huge profits, with its reach bleaching, anticorrosion, prolong the holding time, in flour and Flour product, ground rice, bean vermicelli, bean curd stick, white sugar, preserved fruit, water-soaked food, aquatic products and seafood products, pharmaceutical products, add " sodium formaldehyde sulfoxylate " that country bans use of.
The method of measuring formaldehyde, rongalite has a series of sensitivities such as chemical analysis and instrumental method, method accurately, but they mostly are unsuitable for as portable, on-the-spot formaldehyde and the rongalite of detecting.The food poisoning and the air pollution occurrence that cause along with food hygiene and decorations constantly take place, people press for a kind of home-use, low price, accurately, the assay determination means of formaldehyde, rongalite in formaldehyde, food and the medicine in the fast detecting air, up to now, Shang Weijian both can measure gas, and the disposable formaldehyde speed that can measure liquid and solid is again surveyed the relevant report of pipe.
The utility model content:
The purpose of this utility model is to provide in a kind of low price, sensitivity, detected gas, liquid and the solid accurate, quick, simple and easy to use the disposable colorimetric speed of formaldehyde and rongalite to survey bag.
For achieving the above object, take following technical scheme:
The utility model is that a kind of disposable colorimetric speed is surveyed bag, it is characterized in that it comprises an external packing and be encapsulated in the interior a series of apparatus of described external packing that be specially: one or more absorption of sample are handled pipe; One or more stopple coupons; Two reagent pipes; A color comparison tube; Diacetone, phenol reagent and three kinds of developers of AHMT; Colorimetric card.
Described absorption of sample is handled pipe and is gas absorption bottle and solid phase extraction bottle.Described gas absorption bottle comprises a flat thick shape bottle and a supporting bottle cap.Described solid phase extraction bottle comprises perpendicular rectangular column bottle, a cylindric bottleneck and a supporting bottle cap.
Described stopple coupon is flour, ground rice stopple coupon, solid sample stopple coupon and liquid sampling pipe.Wherein, described flour, ground rice stopple coupon are divided into thicker top and thinner tip, top seal, and the tip opening, top and tip nature transition connect as one; Described solid sample stopple coupon is divided into thicker top and thinner tip, open top, and the tip sealing, top and tip nature transition connect as one; Described liquid sampling pipe is divided into thicker top, thin slightly middle part and thinner tip, top seal, and the tip opening, top, middle part and tip nature transition connect as one.
Described reagent pipe is divided into thicker top, thin slightly and long middle part and tapered tip, top seal, and the tip port sealing, top, middle part and tip nature transition connect as one.
Described color comparison tube is divided into thicker cylindric top and thin slightly circular columnar bottom, top seal, and bottom port seals, and top and bottom nature transition connect as one; In the described chromoscope developer is housed.
According to technique scheme, the utility model has the advantages that:
The apparatus of doing the one-time detection analysis all concentrates in the external packing, does not need complicated instrument and equipment, can finish detection, and is very easy to use.
Can on-the-spot semiquantitative determination gas, formaldehyde, rongalite in liquid and the solid sample, can directly on formaldehyde, rongalite quick measuring card, read the result of detection.
Sampling, chemical reaction, colour developing is all finished in transparent or semitransparent plastic tube, and not only sample and reagent dosage are few, and the reagent after using can reclaim with the plastic tube sealing, prevent and have reduced secondary pollution.
Detection speed is fast, measures a sample and only needs 3～10 minutes.
Description of drawings:
Fig. 1 handles the tubular construction synoptic diagram for the utility model absorption of sample.
Fig. 2 is the structural representation of the utility model stopple coupon.
Fig. 3 is the structural representation of the utility model reagent pipe.
Fig. 4 is the utility model color comparison tube structural representation.
Fig. 5 is the utility model colorimetric card design diagram.
Embodiment:
The utility model principle is based on formaldehyde in the sample, rongalite and developer reaction and generates colored compound, the visual colorimetric analysis method that this compound is set up the selective absorption of visible light.
The basic skills that PARA FORMALDEHYDE PRILLS(91,95), rongalite detect has diacetone reagent colourimetry, phenol reagent colourimetry and AHMT (4-amino-3 nitrogen-5-sulfydryl-1,2,4-triazole) reagent colourimetry.Diacetone reagent colourimetry is in the presence of acetic acid-ammonium acetate buffer solution, and formaldehyde, rongalite and diacetone effect generate yellow compound; The phenol reagent colourimetry is based on formaldehyde, rongalite and phenol reagent (3-formaldehyde-2 benzothiazole hydrochloride) reaction and produces piperazine, in the presence of oxygenant potassium metaperiodate or ammonium ferric sulfate, generates blue and bluish violet compound.And AHMT reagent colourimetry is based on formaldehyde, rongalite and the condensation in alkaline medium of AHMT reagent, generates bluish violet and aubergine compound through potassium metaperiodate or ammonium persulfate oxidation then.
Fig. 1 to Fig. 5, shown that the utility model needs all apparatus of using in detection, they are: the absorption of sample shown in Fig. 1 is handled pipe 1 and 2, stopple coupon 3 shown in Fig. 2 and 4 and 5, reagent pipe 6 and 7 shown in Fig. 3, colorimetric card 9 shown in color comparison tube 8 shown in Fig. 4 and Fig. 5, all these apparatus concentrate on (not expression among the figure) in the external packing, just are combined into the utility model.Above-mentioned apparatus can be made with any transparent material, but preferably uses plastics; External packing can be material and the form that is fit to arbitrarily, and as bag, box or case or the like, the utility model is not done special restriction; The arrangement of above-mentioned apparatus in external packing is arbitrarily, both can fix one by one, also can stack, or bulk storage, the utility model is not done special restriction yet.
By shown in Figure 1, absorption of sample is handled pipe for gathering and handle the place of sample, in order to adapt to different analytic targets, gaseous sample absorption bottle 1 and solid sample extraction flask 2 can be arranged.On structure, gaseous sample absorption bottle 1 comprises a flat thick shape bottle 11 and a supporting bottle cap 12, and bottle cap 12 seals when covering with bottle 11.Gas absorption bottle 1 can be diameter 20～60mm, the plastic bottle of high 10～60mm or vial; Solid sample extraction flask 2 comprises perpendicular rectangular column bottle 21, one cylindric bottlenecks 23 and a supporting bottle cap 22, and bottle 21 is an one with bottleneck 23, and bottle cap 22 can cover or break away from bottleneck 23; Solid sample extraction flask 2 can be diameter 10～30mm, transparent or semitransparent plastic bottle or the vial of high 30～80mm.
Stopple coupon shown in Fig. 2 has flour, ground rice stopple coupon 3, solid sample stopple coupon 4,5 three kinds of forms of fluid sample stopple coupon, they have different designs according to the physical aspect difference of institute's sample thief, flour, ground rice stopple coupon 3 are divided into thicker top 31 and thinner tip 32, top 31 sealings, tip 32 openings, top 31 and tip 32 natural transition connect as one; Solid sample stopple coupon 4 also is divided into thicker top 41 and thinner tip 42, top 41 openings, and tip 42 sealings, top 41 and tip 42 natural transition connect as one; Liquid sampling pipe 5 is divided into thicker top 51, thin slightly middle part 53 and thinner tip 52, top 51 sealings, and tip 52 openings, top 51, middle part 53 and tip 52 natural transition connect as one.Stopple coupon is marked with scale, and throughput sample thief volume is determined sampling amount.Flour, ground rice stopple coupon 3 can be made for the transparent or semitransparent plastic dropper of 0.5～10ml, at the most advanced and sophisticated thin bore of the stopple coupon sample of partly packing into; Solid sample stopple coupon 4 can be made for the transparent or semitransparent plastic dropper of 0.5～10ml, at the solid stopple coupon particle size mouth end sample of packing into; Fluid sample stopple coupon 5 can be the transparent or semitransparent plastic dropper of 0.5～10ml.
Reagent pipe shown in Fig. 3 comprises reagent one pipe 6 and reagent two pipes 7, reagent pipe 6,7 structures are identical, be divided into thicker top 61,71, thin and long slightly middle part 63,73 and tapered tip 62,72, top 61,71 sealings, tip 62,72 port sealings, top 61,71, middle part 63,73 and tip 62,72 natural transition connect as one.The different reagent of packing in the two reagent pipes, in the utility model, they need be in sealing state, open during use, specifically in an embodiment, they can be the transparent or semitransparent plastic dropper of 0.5～10ml again, behind the reagent of packing into, with the liquid droping port heated sealant.
9 of colorimetric cards shown in Fig. 5 demonstrate the standard coloration color range above as a card, and indicate variable concentrations formaldehyde and the rongalite numerical value with change color.The shape and the size of card itself are not particularly limited, and quantity also can be for one or more, and the arrangement design of color lump also can be varied on the card.Adopt different color mechanisms, the color of colorimetric card 9 and color range can be different, need be supporting with the developer that added in reagent pipe 6,7 and the chromoscope 8.
In the utility model, absorption of sample is handled pipe 1 and 2, and stopple coupon 3 and 4 and 5 situation of all can dividing is selected to use, and reagent pipe 6 and 7, color comparison tube 8 and colorimetric card 9 are essential apparatus in each mensuration generally.
Utilize the utility model on-site measurement formaldehyde, rongalite example, this example adopts the diacetone colourimetry.
Sampling method: when being used for the sampling of flour and ground rice, pinch flour, ground rice stopple coupon 3 particle size parts, partly take a sample with fine inner diameter with hand.When being used for the solid sample sampling, be used to pinch solid stopple coupon 4 fine inner diameter parts, with thick inner-diameter portion whose sampling, with 5 pairs of fluid sample direct samples of liquid sampling pipe, gaseous sample is then put into absorbent solution in plastic gas bulk absorption bottle 1, naturally be diffused in the absorbent solution by air, take a sample with the liquid sampling pipe then.
Preparation and making that colorimetric speed is surveyed bag: behind the fixedly potpourri of in gas absorption bottle 1 and solid phase extraction bottle 2, pack into respectively 50mg sodium sulphate, 50mg glazier's salt, 400mg disodium ethylene diamine tetraacetate, seal, the 10ml that packs in reagent one pipe 6 contains to heat after the aqueous solution of 0.2% ethylenediamine and seals, the 2ml that packs in reagent two pipe 7 contains to heat after the aqueous solution of 0.2g ammonium acetate and 0.1ml glacial acetic acid and seals, and the 0.5ml that packs in color comparison tube 8 contains to heat behind 0.25% the diacetone and seals.Formaldehyde determination step in room air, decorating and renovating material and the textile:
Open gas absorption bottle 1 lid, cutting off the tip of reagent one pipe 6 seals, it is splashed in the gas absorption bottle 1, cover tight gas absorption bottle 1 lid, fluctuated for 30 seconds, open gas absorption bottle 1 lid, put it into room to be measured, in decorating and renovating material or the textile formaldehyde gatherer after 0.5～8 hour, take out gas absorption bottle 1, cut off reagent two pipes 7 tips and seal, reagent 27 is splashed into mixing in the gas absorption bottle 1, cutting off colorimetric bottle 8 tips then seals, air in the delivery ratio colour tube 8 after automatic draw solution in the color comparison tube 8 insertion gas absorption bottles 1, grasps color comparison tube 8 bottoms, by body temperature heating 3～5 minutes, solution colour is compared with quick measuring card color range 9 by the colourless yellow that becomes in the color comparison tube 8, reads the concentration value of formaldehyde in the sample.Formaldehyde, rongalite determination step in food, medicine and the drink:
Open solid phase extraction bottle 2 lids, according to different samples, use stopple coupon 3 respectively, 4,5 sample thiefs, 1～10g, cutting off the tip of reagent one pipe 6 seals, it is splashed in the solid phase extraction bottle 2, lid fastener extraction flask 2 lids, fluctuated 1～3 minute, extraction flask 2 static 3～5 minutes, liquid sampling pipe 5 is inserted sucking-off extract in the solid phase extraction bottle supernatant, cut off reagent two pipe 7 and color comparison tube 8 tips respectively and seal, solution in extract and reagent two pipes 7 is splashed in the color comparison tube 8 mix, grasp color comparison tube 8 bottoms, by body temperature heating 3～5 minutes, solution colour is compared with quick measuring card color range 9 then by the colourless yellow that becomes in the color comparison tube 8, reads formaldehyde in the sample, the concentration value of rongalite.
With phenol reagent colourimetry and AHMT colourimetry, identical with above-mentioned example assay method, just according to different color mechanisms, the reagent of being packed in reagent pipe 6,7 and the color comparison tube 8 is different, and the color of colorimetric card 9 is different with color range, shows row no longer one by one at this.
From above-mentioned example as can be seen, measuring used whole reagent, sampling instrument and chromogenic reaction thereof all finishes in plastic bottle 1,2 or plastic tube 3,4,5,6,7,8, do not need other complex instrument and equipment can finish detection, the on-the-spot semiquantitative determination of particularly suitable; The utility model both can be collected gas by gas absorption bottle 1, measures the content of formaldehyde in the gas, also can be used for measuring by formaldehyde, the rongalite that liquid extraction bottle 2 is collected in liquid and the solid sample, in the use without limits; And sampling, chemical reaction, colour developing is all finished in transparent or semitransparent plastic tube, and not only sample and reagent dosage are few, and the reagent after using can reclaim with the plastic tube sealing, prevent and have reduced secondary pollution; And one of characteristics of the utility model maximum when being also that it is measured operation very simple, and detection speed is fast, measures only need 3～10 minutes of a sample.
Claims (10)
1, a kind of disposable colorimetric speed is surveyed bag, it is characterized in that, it comprises an external packing and be encapsulated in the interior a series of apparatus of described external packing, is specially:
One or more absorption of sample are handled pipe;
One or more stopple coupons;
Two reagent pipes;
A color comparison tube;
Diacetone, phenol reagent and three kinds of developers of AHMT;
Colorimetric card.
2, disposable colorimetric speed according to claim 1 is surveyed bag, it is characterized in that, described absorption of sample is handled pipe and is gas absorption bottle (1), solid phase extraction bottle (2).
3, disposable colorimetric speed according to claim 2 is surveyed bag, it is characterized in that described gas absorption bottle (1) comprises a flat thick shape bottle and a supporting bottle cap.
4, disposable colorimetric speed according to claim 2 is surveyed bag, it is characterized in that, described solid phase extraction bottle (2) comprises perpendicular rectangular column bottle, a cylindric bottleneck and a supporting bottle cap.
5, disposable colorimetric speed according to claim 1 is surveyed bag, it is characterized in that described stopple coupon is flour, ground rice stopple coupon (3), solid sample stopple coupon (4) and liquid sampling pipe (5).
6, survey bag according to the described disposable colorimetric speed of claim 5, it is characterized in that described flour, ground rice stopple coupon (3) are divided into thicker top and thinner tip, top seal, the tip opening, top and tip nature transition connect as one.
7, disposable colorimetric speed according to claim 5 is surveyed bag, it is characterized in that described solid sample stopple coupon (4) is divided into thicker top and thinner tip, open top, and the tip sealing, top and tip nature transition connect as one.
8, disposable colorimetric speed according to claim 5 is surveyed bag, it is characterized in that described liquid sampling pipe (5) is divided into thicker top, thin slightly middle part and thinner tip, top seal, the tip opening, top, middle part and tip nature transition connect as one.
9, disposable colorimetric speed according to claim 1 is surveyed bag, it is characterized in that described reagent pipe (6,7) is divided into thicker top, thin slightly and long middle part and tapered tip, top seal, the tip port sealing, top, middle part and tip nature transition connect as one.
10, disposable colorimetric speed according to claim 1 is surveyed bag, it is characterized in that described color comparison tube (8) is divided into thicker cylindric top and thin slightly circular columnar bottom, top seal, and bottom port seals, and top and bottom nature transition connect as one; In the described chromoscope developer is housed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02240397 CN2551996Y (en) | 2002-07-16 | 2002-07-16 | Disposable colorimetric fast measuring bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02240397 CN2551996Y (en) | 2002-07-16 | 2002-07-16 | Disposable colorimetric fast measuring bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2551996Y true CN2551996Y (en) | 2003-05-21 |
Family
ID=33713525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02240397 Expired - Lifetime CN2551996Y (en) | 2002-07-16 | 2002-07-16 | Disposable colorimetric fast measuring bag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2551996Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116744A (en) * | 2010-02-08 | 2011-07-06 | 力德力诺生物技术(北京)有限公司 | Device for detecting hydrogen peroxide and preparation method thereof |
| CN101718706B (en) * | 2009-12-07 | 2012-04-25 | 扬州大学 | Testing agent for implementing field fast detection of formaldehyde in air |
| CN102749327A (en) * | 2012-07-25 | 2012-10-24 | 中国科学院上海有机化学研究所 | Urine sugar rapid detecting method based on chemical chromogenic reaction at room temperature |
| CN103217419A (en) * | 2013-04-08 | 2013-07-24 | 陕西理工学院 | Quick detecting method for formaldehyde content in aquatic product |
| CN104297240A (en) * | 2014-10-24 | 2015-01-21 | 中国人民解放军国防科学技术大学 | Method and device applied to detection of toxic metal ions in water |
| CN104374699A (en) * | 2014-11-12 | 2015-02-25 | 宁波美康盛德生物科技有限公司 | Multi-reagent colorimeter tube for portable colorimetric device |
| CN104406974A (en) * | 2014-11-28 | 2015-03-11 | 苏州东辰林达检测技术有限公司 | Formaldehyde detection agent and preparation method thereof |
-
2002
- 2002-07-16 CN CN 02240397 patent/CN2551996Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718706B (en) * | 2009-12-07 | 2012-04-25 | 扬州大学 | Testing agent for implementing field fast detection of formaldehyde in air |
| CN102116744A (en) * | 2010-02-08 | 2011-07-06 | 力德力诺生物技术(北京)有限公司 | Device for detecting hydrogen peroxide and preparation method thereof |
| CN102749327A (en) * | 2012-07-25 | 2012-10-24 | 中国科学院上海有机化学研究所 | Urine sugar rapid detecting method based on chemical chromogenic reaction at room temperature |
| CN103217419A (en) * | 2013-04-08 | 2013-07-24 | 陕西理工学院 | Quick detecting method for formaldehyde content in aquatic product |
| CN104297240A (en) * | 2014-10-24 | 2015-01-21 | 中国人民解放军国防科学技术大学 | Method and device applied to detection of toxic metal ions in water |
| CN104374699A (en) * | 2014-11-12 | 2015-02-25 | 宁波美康盛德生物科技有限公司 | Multi-reagent colorimeter tube for portable colorimetric device |
| CN104406974A (en) * | 2014-11-28 | 2015-03-11 | 苏州东辰林达检测技术有限公司 | Formaldehyde detection agent and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120716 Granted publication date: 20030521 |