CN102353673A - Formaldehyde test paper and preparation method thereof - Google Patents
Formaldehyde test paper and preparation method thereof Download PDFInfo
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- CN102353673A CN102353673A CN2011102939449A CN201110293944A CN102353673A CN 102353673 A CN102353673 A CN 102353673A CN 2011102939449 A CN2011102939449 A CN 2011102939449A CN 201110293944 A CN201110293944 A CN 201110293944A CN 102353673 A CN102353673 A CN 102353673A
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Abstract
The invention discloses formaldehyde test paper and a preparation method thereof, belongs to the field of chemical detection and solves the technical problem of high cost of traditional formaldehyde test paper. The formaldehyde test paper is prepared by impregnating paper in a color development reagent. The method comprises the following steps of: firstly, dissolving the weighed ammonium acetate and glacial acetic acid and newly-distillated acetylacetone into distilled water to obtain the color development reagent; and secondly, at room temperature, impregnating the paper in the color development reagent obtained in the first step to obtain the formaldehyde test paper. The formaldehyde test paper is used for testing formaldehyde.
Description
Technical field
The invention belongs to field of chemical detection.
Background technology
Formaldehyde is VOC, and pollution source are a lot, is one of major pollutants of indoor environment.It is preferentially controlled at China's toxic chemical and is in second on the list, has strong carcinogenic, teratogenesis and mutagenesis.The room air content of formaldehyde of national regulation must not be greater than 0.08mg/m
3If formaldehyde is excessive in the air, can produce spread effect, serious harm human beings'health to eyes and skin.At present, the room air, public place air, Drinking Water and the food pollution that are caused by formaldehyde have caused showing great attention to of people, and relevant formaldehyde is also more and more to the report of human health damage.In recent years, content of formaldehyde has year by year the trend that increases in the room, and on average six of the value of being above standard to seven times, but owing to formaldehyde is that colourless gas and olfactory threshold vary with each individual and be generally 1.07mg/m
3, be difficult for being discovered by people, need to measure by instrument more.
At present also do not have a kind of comparatively desirable formaldehyde field fast detection method: AAS receives the restriction of operating conditionss such as the water-bath or the concentrated sulphuric acid; Electrochemical assay is had relatively high expectations to sample pretreatment; Chromatography is limited by instrument and equipment, and sensor formaldehyde cost is high, the life-span is short, and the formaldehyde fast detecting case on the present market needs professional's operation; Cost is high, and general family is difficult to popularize.
Analyze the relative merits of relatively more existing detection method, this team hopes to design a kind of scene fast and detects the test paper that whether content of formaldehyde exceeds standard in the air.Make a general survey of domestic and international correlative study present situation, the patent that existing multiple formaldehyde detects test paper is declared, but great majority all are to be used for qualitative or formaldehyde in food content such as half-quantitative detection marine product, and the test paper that detects for content of formaldehyde in the air and few.Wherein U.S. Pat 451168 disclosed methods are: on solid support, form the supercarbonate deposition earlier; Use AHMT (4-amino-3-hydrazine-5-sulfydryl-1 again; 2; The 4-triazole) organic ketone solution-treated supercarbonate deposition is exposed in the air then, detects airborne concentration of formaldehyde.The major defect of the method is that detection sensitivity is low, and its minimum formaldehyde detectability is greater than 0.08mg/m
3, can not satisfy the demand of content of formaldehyde in the sensing chamber.Chinese patent publication number 1563954A, disclosed method is to utilize the test paper that is soaked with AHMT, potassium hydroxide, potassium metaperiodate to detect airborne concentration of formaldehyde.Yet AHMT is unstable under alkali condition, and is therefore too short according to the product storage life of this patent manufacturing.And Chinese patent publication number 101086479A improves this, and developer AHMT is separated with test paper, and highly basic is stated from the holder, and AHMT is dissolved in the acid solution, drips on test paper when to be used again.
In view of these patents mostly are to detect the principles of formaldehyde according to the AHMT method, and AHMT costs an arm and a leg.
Summary of the invention
The present invention will solve existing formaldehyde and detect the high technical matters of test paper cost; And provide formaldehyde to detect test paper and preparation method thereof.
Formaldehyde detection test paper floods paper to be processed in the developer, and said developer is that the diacetone and the 100mL distilled water of 25g ammonium acetate, 3mL glacial acetic acid, 0.3mL distillation is formed.
The preparation method that formaldehyde detects test paper is undertaken by following step: step 1, accurately take by weighing the 25g ammonium acetate after; Accurately pipette the diacetone of 3mL glacial acetic acid and 0.3mL distillation then respectively; Diacetone with ammonium acetate, glacial acetic acid and the distillation of weighing is dissolved in the 100mL distilled water again, obtains developer;
Under step 2, the room temperature, paper is immersed in the developer that step 1 obtains, the lucifuge dip time is 24 hours under the room temperature; Promptly obtain formaldehyde and detected test paper.
Directly adopt moistening test paper that airborne formaldehyde gas is tested among the present invention; Measure the content of formaldehyde concentration (0.08mg/m that is up to state standards
3) more than 10 times.Can qualitatively detect content of formaldehyde: do not exceed standard, exceed standard 1 times, exceed standard 5 times, exceed standard 10 times, exceed standard 20 times with sxemiquantitative ground.And made supporting colorimetric card for comparison.
So formaldehyde of the present invention detects test paper and is different from existing formaldehyde detection test paper, need not be easy to grasp by the instrument and equipment of complicacy during test, and is easy and simple to handle, energy savings, and used developer is cheap and easy to get, greatly reduces cost.
Method for making is simple.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the combination in any between each embodiment.
Embodiment one: formaldehyde detection test paper floods paper in the developer and processes in this embodiment, and said developer is that the diacetone and the 100mL distilled water of 25g ammonium acetate, 3mL glacial acetic acid, 0.3mL distillation is formed.
Can be by the content of formaldehyde concentration (0.08mg/m that is up to state standards
3) color and process colorimetric card, convenient detection when 1 times, 5 times, 10 times and 20 times.
Different detection formaldehyde mode is compared
AHMT method: formaldehyde and 4-amino-3-hydrazine-5-sulfydryl-1; 2,4-triazole (AHMT) condensation under alkali condition is oxidized to 6-sulfydryl-5-triazole [4 through potassium metaperiodate then; 3-b]-S-tetrazine aubergine compound, its color and luster depth is directly proportional with content of formaldehyde.
Pinkish red sulphurous acid colourimetry: formaldehyde and basic fuchsin and sulphurous acid reaction are rose alkyl chromophore, and its color is directly proportional with content of formaldehyde.
Pinkish red sulphurous acid-concentrated sulphuric acid colourimetry: formaldehyde and basic fuchsin and sulphurous acid reaction are rose alkyl chromophore, add concentrated sulfuric acid solution again, generate light blue compound, and its shade is directly proportional with content of formaldehyde.
Benedict colourimetry: formaldehyde and Cu
2+Effect is oxidized to formic acid, Cu
2+Then be reduced into the Chinese red copper oxidule precipitation, can be used for colorimetric estimation formaldehyde.
The phenol reagent colourimetry: airborne formaldehyde generates piperazine (Azine) after phenol reagent 3-methyl-2-[4-morpholinodithio ketone hydrazone hydrochloride solution absorption, in acid solution, formed blue compound by the ferric ion oxidation.
Permanganimetric method: liquor potassic permanganate is aubergine, runs into that MnO4 and formolite reaction generate colourless divalent manganesetion behind the formaldehyde, and solution also becomes light red or colourless thereupon, can be used for colorimetric estimation formaldehyde.
AHMT in the AHMT method costs an arm and a leg, and existing multiple patent use AHMT method about formaldehyde detection test paper, so do not do experiment.In all the other methods, Benedict colourimetry, phenol reagent colourimetry and permanganimetric method color developing effect are very not obvious.Pinkish red sulphurous acid-concentrated sulphuric acid colourimetry colour developing obviously be swift in response, but generating light blue compound color will soon be taken off, and owing to used the concentrated sulphuric acid, be unfavorable for making test paper.
Formaldehyde and diacetone can react the generation yellow compound in the environment of ammonia, its change color degree is directly proportional with content of formaldehyde, and reaction principle is following:
Pinkish red sulphurous acid colourimetry and diacetone colourimetry color developing effect are good, and developing time is short, and color stability.Magenta-sodium sulphite and two kinds of developers of diacetone are carried out the contrast experiment of system, have at length write down and analyzed the variety of issue that is run in phenomenon and the experimentation of each experiment, conclusion that obtains such as following table:
The contrast of table 1 magenta-sulfurous method and acetylacetone method
| Magenta-sulfurous method | Acetylacetone method | |
| Discrimination | Good | Good |
| Colour system | Red | Yellow |
| Blank color | Little red | Colourless |
| Developing time | Hurry up | Hurry up |
| Operating conditions | Strict | Medium |
| Reappearance | Difference | Good |
A large amount of chemical experiment in early stage shows that the color range when using magenta-sodium sulphite and diacetone developer to measure formalin concentration has all reached the effect that naked eyes can be distinguished.But the fuchsin sulfite developer still has certain problem aspect reappearance, and operating conditions also has strict restriction, and owing to used concentrated hydrochloric acid, also should not on test paper, use.Diacetone developer then reappearance is good, and is cheap and easy to get.
Embodiment two: what this embodiment and embodiment one were different is: said paper is filter paper or rice paper.
Embodiment three: what this embodiment and embodiment one were different is: said paper is quantitative filter paper or gives birth to a surname.
Embodiment four: what this embodiment was different with one of embodiment one to three is: the shape of said paper is that diameter is 1.5～3.5 centimetres a circle.Other is identical with one of embodiment one to three.
Embodiment five: what this embodiment was different with one of embodiment one to three is: the shape of said paper is that diameter is 2.0 centimetres a circle.
Embodiment six: the preparation method of formaldehyde detection test paper is undertaken by following step in this embodiment:
Step 1, accurately take by weighing the 25g ammonium acetate after, accurately pipette respectively then 3mL glacial acetic acid and 0.3mL the distillation diacetone, just the diacetone of the ammonium acetate of weighing, glacial acetic acid and distillation is dissolved in the 100mL distilled water again, obtains developer;
Under step 2, the room temperature, paper is immersed in the developer that step 1 obtains, the lucifuge dip time is 24 hours under the room temperature.
In the production phase of test paper, the main mode of soaking that adopts makes test paper fully contact with colour developing liquid.If with test paper oven dry, make the developer reaction on airborne formaldehyde and the dry test paper, belong to gas-solid reaction, to react difficulty and carry out, speed is extremely slow.And diacetone is small organic molecule, along with the oven dry of moisture also can be volatilized, is difficult to be retained in the test paper surface.So, directly adopt the reaction of moistening test paper and airborne formaldehyde gas.
Embodiment seven: what this embodiment and embodiment six were different is: the said paper of step 2 is filter paper or rice paper.Other step and parameter and embodiment six phase are together.
Embodiment eight: what this embodiment and embodiment six were different is: the described paper of step 2 is quantitative filter paper or gives birth to a surname.Other step and parameter and embodiment six phase are together.
The head of cotton swab is a cotton, and stalk portion is a bamboo wood.The water absorptivity of cotton is strong, becomes the web-like space structure, and interior porosity is big, and formaldehyde gas can pass the epiphase liquid layer, gets into body and reacts with liquid film.Though increased the contact area of reaction, because inner colour developing is not easy to observe relatively.And the bamboo wood of its stalk portion also can adsorb a certain amount of diacetone solution, the emulative absorption formaldehyde of meeting.
Mature rice paper is to be made through complicated procedures of forming such as boilings, and it is poor that its water absorptivity ratio is given birth to a surname, and in addition, ripe a surname makes the whole apparent partially khaki of soak solution when soaking, and the blank test paper of institute's gripping also has khaki area color.And the main body color behind developer and the formolite reaction also is yellow, receives the restriction of human visual resolving power, and in same variable color gradient, the test paper of no area color is sensitiveer more than the test paper that area color is arranged.
The quantitative filter paper porosity is big, and developer absorption is many, and liquid film is even, and colour developing is obvious, and developing time is short.
The porosity of qualitative filter paper is more on the low side than quantitative filter paper, and surface condition seems slightly coarse, and the paper filament of one deck capillary is arranged.Good penetrability, wetting state is strong, but the surface is difficult for leaving even liquid film, can increase the resistance of mass transfer when absorbing formaldehyde, causes colour developing slow partially, and color is shallow partially.
And the best face tissue of water absorbing properties because after its suction, paper strength obviously reduces, is not easy to gripping with fixing, and cost is high again, also should not be made as test paper.
As for giving birth to a surname, it is all comparatively approaching with quantitative filter paper on color developing effect and developing time, still opens thinlyyer owing to living rice paper, and penetrability is bigger, is subject to background interference during colorimetric.
This shows that the quantitative filter paper effect is best.
Embodiment nine: what this embodiment was different with one of embodiment six to eight is: the shape of the said paper of step 2 is that diameter is 1.5～3.5 centimetres a circle.Other step is identical with one of embodiment six to eight with parameter.
Embodiment ten: what this embodiment was different with one of embodiment six to eight is: the shape of the said paper of step 2 is that diameter is 2.0 centimetres a circle.Other step is identical with one of embodiment six to eight with parameter.
The color developing effect that the area of used paper size PARA FORMALDEHYDE PRILLS(91,95) detects has certain restriction, then can absorb more colour developing liquid if paper is excessive, and formaldehyde limited in the space is contacted with the colour developing liquid on test paper top layer; The yellow compound average mark that causes reacting the back generation is dispersed in whole test paper surface; The gathering and the observation that are unfavorable for color are compared, and the size of test paper gets final product in right amount for this reason, and is unsuitable excessive; Can not make the colour developing liquid of test paper absorption too much, must satisfy the minimum requirements that to measure formaldehyde again.
Airborne content of formaldehyde is a stable homogeneous, but the colour developing of square test paper and inhomogeneous.Border color is darker than center color, the place of four angle points especially, color especially with center difference to some extent.The Boundary Effect problem of square test paper can influence the colour developing accuracy of test paper to a certain extent.
Circle has very outstanding boundary condition, does not have the angle point of outside protrusion (or inwardly recessed).Though yet have the problem that exceeds the quata to absorb in the boundary layer, through various diffusional effects, this lack of uniformity that can decay, the accuracy of raising colour developing test paper.The colour developing elevation map of circular test paper is comparatively even.
Diameter is during greater than 4 centimetres, is absorbed in the exceeding the quata of border in time of reaction and can't evenly diffuses to the test paper center, causes the result who detects inaccurate, can't compare with colorimetric card.Diameter is during less than 1 centimetre, and the liquid film amount of preserving on the test paper is very few, is unfavorable for control.And gripping inconvenience, be unfavorable for the application of testing.Because diameter variation is continuous, and this group does right that according to the facts to test all be that the single-point that disperses is tested, so take all factors into consideration, is optimum diameter in the time of 2 centimetres, and 1.5 centimetres～3 centimetres is optional scope.
Empirical tests, this embodiment effect is best.
Adopt following verification experimental verification effect of the present invention:
The preparation method that formaldehyde detects test paper is undertaken by following step:
Step 1, accurately take by weighing the 25g ammonium acetate after, accurately pipette respectively then 3mL glacial acetic acid and 0.3mL the distillation diacetone, just the diacetone of the ammonium acetate of weighing, glacial acetic acid and distillation is dissolved in the 100mL distilled water again, obtains developer;
Under step 2, the room temperature, be that the quantitative test paper of 2.0 centimetres circle is immersed in the developer that step 1 obtains with diameter, the lucifuge dip time is 24 hours under the room temperature.
Under laboratory condition, but this test paper sxemiquantitative ground detects the content of formaldehyde (this formaldehyde atmosphere is quantitative configuration, and concentration is known) in the enclosed environment, and reaches corresponding color rank.Under true environment, the result of the aspiration pump gas collection detection method of this test paper and national standard is close.
Claims (10)
1. formaldehyde detects test paper, it is characterized in that formaldehyde detects test paper and paper is flooded processes in the developer, and said developer is made up of the diacetone and the 100mL distilled water of 25g ammonium acetate, 3mL glacial acetic acid, the new distillation of 0.3mL.
2. formaldehyde according to claim 1 detects test paper, it is characterized in that paper is filter paper or rice paper.
3. formaldehyde according to claim 1 detects test paper, it is characterized in that paper is quantitative filter paper or gives birth to a surname.
4. detect test paper according to claim 1,2 or 3 described formaldehyde, the shape that it is characterized in that paper is that diameter is 1.5～3.5 centimetres a circle.
5. detect test paper according to claim 1,2 or 3 described formaldehyde, the shape that it is characterized in that paper is that diameter is 2.0 centimetres a circle.
6. formaldehyde detects the preparation method of test paper, it is characterized in that the preparation method of formaldehyde detection test paper is undertaken by following step:
Step 1, accurately take by weighing the 25g ammonium acetate after, accurately pipette the diacetone of 3mL glacial acetic acid and 0.3mL distillation then respectively, the diacetone with the ammonium acetate of weighing, glacial acetic acid and new distillation is dissolved in the 100mL distilled water again, obtains developer;
Under step 2, the room temperature, paper is immersed in the developer that step 1 obtains, the lucifuge dip time is 24 hours under the room temperature; Promptly obtain formaldehyde and detected test paper.
7. formaldehyde according to claim 1 detects the preparation method of test paper, it is characterized in that the said paper of step 2 is filter paper or rice paper.
8. formaldehyde according to claim 1 detects the preparation method of test paper, it is characterized in that the said paper of step 2 is quantitative filter paper or gives birth to a surname.
9. detect the preparation method of test paper according to claim 1,2 or 3 described formaldehyde, the shape that it is characterized in that the said paper of step 2 is that diameter is 1.5～3.5 centimetres a circle.
10. detect the preparation method of test paper according to claim 1,2 or 3 described formaldehyde, the shape that it is characterized in that the said paper of step 2 is that diameter is 2.0 centimetres a circle.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978912A (en) * | 2012-11-19 | 2013-03-20 | 东华大学 | Preparation method of nanofiber membrane formaldehyde test paper |
| CN104359902A (en) * | 2014-11-13 | 2015-02-18 | 上海应用技术学院 | Formaldehyde colour-rendering test paper, and preparation method and application thereof |
| CN114088698A (en) * | 2021-11-18 | 2022-02-25 | 马刘锁 | Formaldehyde detection test paper and preparation method thereof |
| CN117761045A (en) * | 2023-12-26 | 2024-03-26 | 杭州智泓达科技有限公司 | Formaldehyde chromogenic test paper, preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4438206A (en) * | 1981-11-19 | 1984-03-20 | Kikkoman Corporation | Method for determination of formaldehyde |
| CN1487296A (en) * | 2003-07-14 | 2004-04-07 | 大连理工大学 | Test paper for fast detecting formaldehyde content in aquatic product without interference from protein |
| CN101000309A (en) * | 2006-12-19 | 2007-07-18 | 中山大学 | Test paper for quickly investigating formol content in aquatic product |
-
2011
- 2011-09-30 CN CN2011102939449A patent/CN102353673A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4438206A (en) * | 1981-11-19 | 1984-03-20 | Kikkoman Corporation | Method for determination of formaldehyde |
| CN1487296A (en) * | 2003-07-14 | 2004-04-07 | 大连理工大学 | Test paper for fast detecting formaldehyde content in aquatic product without interference from protein |
| CN101000309A (en) * | 2006-12-19 | 2007-07-18 | 中山大学 | Test paper for quickly investigating formol content in aquatic product |
Non-Patent Citations (3)
| Title |
|---|
| SHUO WANG ET AL.: "Rapid determination of formaldehyde and sulfur dioxide in food products and Chinese herbals", 《FOOD CHEMISTRY》 * |
| 赵洋甬等: "水中甲醛快速测定法", 《福建分析测试》 * |
| 韩业新等: "检测水发或水产品中甲醛的快速定性检测试纸的实验研究与应用", 《预防医学论坛》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978912A (en) * | 2012-11-19 | 2013-03-20 | 东华大学 | Preparation method of nanofiber membrane formaldehyde test paper |
| CN102978912B (en) * | 2012-11-19 | 2014-10-15 | 东华大学 | Preparation method of nanofiber membrane formaldehyde test paper |
| CN104359902A (en) * | 2014-11-13 | 2015-02-18 | 上海应用技术学院 | Formaldehyde colour-rendering test paper, and preparation method and application thereof |
| CN104359902B (en) * | 2014-11-13 | 2017-05-03 | 上海应用技术学院 | Formaldehyde colour-rendering test paper, and preparation method and application thereof |
| CN114088698A (en) * | 2021-11-18 | 2022-02-25 | 马刘锁 | Formaldehyde detection test paper and preparation method thereof |
| CN117761045A (en) * | 2023-12-26 | 2024-03-26 | 杭州智泓达科技有限公司 | Formaldehyde chromogenic test paper, preparation method and application thereof |
| CN117761045B (en) * | 2023-12-26 | 2024-05-24 | 杭州智泓达科技有限公司 | Formaldehyde chromogenic test paper, preparation method and application thereof |
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Application publication date: 20120215 |