CN102221546A - Detection test paper for formaldehyde and/or acetaldehyde in air, detection method thereof and preparation method for detection test paper - Google Patents
Detection test paper for formaldehyde and/or acetaldehyde in air, detection method thereof and preparation method for detection test paper Download PDFInfo
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Abstract
The invention relates to detection test paper for low-concentration formaldehyde and/or acetaldehyde in air. A preparation method for the detection test paper comprises the following steps of: (1) impregnating blank test paper into 50-70-DEG C impregnation solution consisting of basic fuchsine, a citric acid and water, taking the test paper out after the test paper fully absorbs the solution, baking the test paper until the water content of the test paper is 30 to 50 percent by weight, and cutting the test paper into a set size; and (2) arranging the test paper on a sieve plate in a vacuum drying oven, vacuumizing the vacuum drying oven, introducing a mixed gas consisting of sulfur dioxide, hydrogen chloride and the water according to the molar ratio of 87-93: 5-10: 2-3 into the vacuum drying oven, performing reaction until the red of the test paper is faded, vacuumizing the vacuum drying oven, and continuing keeping vacuum drying for 4 to 5 hours to obtain the detection test paper. The detection test paper provided by the invention is suitable for measuring a wide interval range of concentration of pollutants, and can distinguish the pollution degree of formaldehyde with relatively lower concentration and simultaneously perform semiquantitative analysis on the pollution degree of cigarettes in the air. In addition, the detection test paper can be prepared by a simple process without producing any pollutant.
Description
Technical field
The present invention relates to detect low concentration in the air formaldehyde, acetaldehyde concentration the detection test paper with and the preparation method of detection method and detection test paper.
Background technology
In recent years, the widespread use of new chemical material, the indoor environmental pollution problem becomes increasingly conspicuous, and is detrimental to health, and reduces quality of life, influences work efficiency, reduces body immunity.According to BJ Children's Hospital's statistics, the leukemia children family more than 90% carried out house decoration in the recent period.A lot of conventions, stadiums (comprising 2008 Olympic venues) install with transformation process in also caused chemical contamination problem such as formaldehyde, arouse extensive attention at home and abroad.Formaldehyde is main a kind of in the indoor pollutant, and long-term contact can increase the possibility of suffering from cancer, and the formaldehyde in the indoor floor, furniture can continue to discharge 3～5 years even the longer time.But in the lower or ventilation of can not windowing for a long time under the outdoor temperature condition with higher summer of outdoor temperature in winter, cause that formaldehyde gathers in the room, be in the health that this kind environment can influence the people for a long time.
The value of limiting the quantity of of indoor formaldehyde content is 0.08mg/m in the national standard
3, and be lower than the existence that people under the situation of 1.0ppm is difficult to discover with sense of smell formaldehyde at concentration of formaldehyde, so at 0.08 ~ 1.0mg/m
3Formaldehyde in the scope detects becomes problem demanding prompt solution.And in order to detect the quality of finishing material, furniture, whether the room that detects after fitting up can be moved in, need test indoor formaldehyde concentration, along with the raising of people to the habitation environment quality requirement, various environmental friendly materials and air purifier begin to occur, in order to detect the effect of environment-friendly materials and clarifier, also need the formaldehyde testing product.
Formaldehyde tester in the market generally all uses as scientific research apparatus, and price is up to several thousand to several ten thousand yuan, general family is difficult to bear, though the appearance of formaldehyde detectable has changed this situation to a certain extent, but existing market the formaldehyde detectable all exist operation steps various, the detectable concentration scope is less, the problem that performance is stable inadequately.Simultaneously, also exist a part to be used to detect the test paper of formaldehyde in food concentration at present, but this test paper all is to use under liquid environment, it is higher that part is used to detect the usable range of test paper of air formaldehyde concentration, generally more than 10ppm, be difficult to distinguish the 0.08mg/m whether indoor formaldehyde surpasses national regulation
3, therefore need badly a kind of cheap, easy to use, formaldehyde testing product in the air of stable performance.
In addition, the harm of cigarette is common to all, and the objectionable impurities in the cigarette can stick on wall, seat, the apparatus, forms the long-term pollution source that slowly discharge in indoor or car, but does not have to detect the test paper or the reagent of cigarette pollution degree in the market.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiencies in the prior art, a kind of preparation method of formaldehyde test paper is provided, the formaldehyde test paper that is prepared by this method not only can detect the formaldehyde of low concentration in the air, and can also be used for the detection of acetaldehyde simultaneously.
The present invention also will provide the detection method of taking above-mentioned formaldehyde test paper to detect formaldehyde in the air or acetaldehyde simultaneously.
For solving above technical matters, a kind of technical scheme that the present invention takes is:
A kind of preparation method who is used to detect the detection test paper of formaldehyde and/or acetaldehyde, it comprises the steps:
(1), gets blank test paper, be impregnated in 50 ℃～70 ℃ the maceration extract of forming by basic fuchsin, citric acid and water, treat to take out after the abundant absorbent solution of test paper, place the vacuum drying chamber of 70 ℃～80 ℃ of temperature, dry by the fire to the test paper water cut be 30wt%～50wt%, take out test paper, be cut into the setting size, this moment, test paper took on a red color, in the described maceration extract, the concentration of basic fuchsin is 0.5 g/L～1.2 g/L, and the concentration of described citric acid is 1.2 g/L～1.5 g/L;
(2), will be positioned over through the test paper loosely of step (1) on the sieve plate in the vacuum drying chamber, vacuumize the back and in case, feed the mixed gas of forming according to mol ratio 87～93:5～10:2～3 by sulphuric dioxide, hydrogen chloride and water, under 20 ℃～30 ℃ of temperature, isothermal reaction is after the redness of test paper is decorporated, to vacuumize in the case, remain on 30 ℃～40 ℃ continuation of temperature vacuum drying and promptly got described detection test paper in 4～5 hours.
Wherein, in the described maceration extract of step (1), the concentration of basic fuchsin is preferably 0.8 g/L～1.2 g/L, most preferably is 1.0 g/L.
The another technical scheme that the present invention takes is: according to the strip test paper that above-mentioned preparation method obtains, its range of size is 50 mm * 10mm～70 mm * 10mm.
For cooperating above-mentioned test paper to detect the concentration of formaldehyde and acetaldehyde, the present invention also provides and described detection test paper matching used standard formaldehyde colorimetric card and standard acetaldehyde colorimetric card, wherein:
Described formaldehyde colorimetric card prepares by the following method: heat paraformaldehyde in the glass cabin, making and forming concentration of formaldehyde in the cabin is 2.0mg/m
3Atmosphere, put into several the present invention by the pass-through box in glass cabin then and detect test paper, close pass-through box, observed test paper change color situation every 1 hour, treat to be kept in the sealing bag standby as sample behind the colour stable; Obtain test paper respectively with same method and be respectively 1.5 mg/m at concentration of formaldehyde
3, 1.0 mg/m
3, 0.5 mg/m
3, 0.1 mg/m
3, 0.05 mg/m
3And 0 mg/m
3Atmosphere under the variable color sample, repeatedly test under the same concentration after the test paper variable color situation, according to sample, make standard formaldehyde colorimetric card, this standard formaldehyde colorimetric card presents the different purple of the degree of depth.
The method that detects formaldehyde in the air is: get the present invention and detect test paper, putting into detected space (can be the room, compartment etc.) in, the color for the treatment of after 4 ~ 10 hours to observe test paper is by colourless when becoming lavender or darkviolet, with standard formaldehyde colorimetric card contrast of the present invention, the data of reading concentration of formaldehyde.
Described acetaldehyde colorimetric card prepares by the following method: heat acetaldehyde solution in the glass cabin, making and forming acetaldehyde concentration in the cabin is 2.0mg/m
3Atmosphere, put into several the present invention by the pass-through box in glass cabin then and detect test paper, close pass-through box, observed test paper change color situation every 1 hour, treat to be kept in the sealing bag standby as sample behind the colour stable; Obtain test paper respectively with same method and be respectively 1.0 mg/m at acetaldehyde concentration
3, 0.5 mg/m
3, 0.05 mg/m
3And 0 mg/m
3Atmosphere under the variable color sample, repeatedly test under the same concentration after the test paper variable color situation, according to sample, make standard acetaldehyde colorimetric card, this standard acetaldehyde colorimetric card presents the different redness of the degree of depth.
The method that detects acetaldehyde in the air is: get above-mentioned detection test paper, put into detected space, the color for the treatment of to observe after 4 ~ 10 hours test paper is by colourless when becoming pale red or carmetta, with standard acetaldehyde colorimetric card contrast of the present invention, the data of reading acetaldehyde concentration.
According to the present invention, can be stored in the polybag that is added with antioxidant and drying agent detecting the test paper sealing.As long as guarantee sealing, detect test paper and can preserve at least three years.
Because the enforcement of above technical scheme, the present invention compared with prior art has following advantage:
1, it is big to detect the concentration interval range of the pollutant that test paper is suitable for measuring, and can detect 0～2 mg/m
3The concentration of the pollutant in the scope, the formaldehyde pollution level of distinguishable low concentration, utilize detect test paper can be fast and obtain formaldehyde release conditions in the occasions such as particular space is particularly indoor, compartment intuitively, whether surpass national standard.In addition, also can utilize and detect test paper the effect of environment-friendly materials and clarifier is carried out semiquantitative mensuration, the environment-friendly materials that make the tester to see very intuitively to be bought or the performance of clarifier;
2, because the detection test paper can be used for the mensuration of acetaldehyde simultaneously, and acetaldehyde is the principal ingredient (60%) of smelling the flavor material in the cigarette, can carry out semi-quantitative analysis to the pollution level of cigarette in the air by the amount of measuring acetaldehyde.
, detect test paper preparation technology simple, preparation process does not produce pollutant, and is cheap, easy to use, the holding time is long.
Description of drawings
Fig. 1 is the photo according to the standard formaldehyde colorimetric card of embodiment 3 making;
Fig. 2 is the photo according to the standard acetaldehyde colorimetric card of embodiment 4 making;
Fig. 3 is the table 1 of colour developing experimental result that has shown the detection test paper of embodiment 1 and 2;
Fig. 4 is the table 2 that has shown the colour developing experimental result of the detection test paper of having preserved embodiment 1 after three months.
Embodiment
The present invention will be further described in detail below in conjunction with specific embodiment, but the invention is not restricted to these embodiment.
Present embodiment provides a kind of detection test paper, and it prepares as follows:
(1), about 60 ℃, the maceration extract that preparation is made up of basic fuchsin, citric acid and water, wherein the concentration of basic fuchsin is 1.0g/L, the concentration of citric acid is 1.2g/L.The blank test paper (being bought directly from the market) of special use is immersed in the solution, treat to take out after the abundant absorbent solution of test paper, be put on the sieve plate, place vacuum drying chamber, under 80 ℃, dry to water cut be 50%, test paper is taken out, be cut into the strip of tailoring into 50*10mm, loose is positioned on the sieve plate;
(2), sieve plate is placed in the vacuum drying chamber, to be evacuated in the case by aspiration pump earlier, in case, feed the mixed gas that sulphuric dioxide, hydrogen chloride and water are formed by air intake opening then, mixed gas consist of sulphuric dioxide: hydrogen chloride: water (mol ratio) is 90:8:2.After treating that the case internal pressure goes back up to normal pressure, close air intake opening, stop ventilation, keep 20 ℃ of the temperature inside the box, interior gas of case and test paper are reacted, window by drying box is observed the test paper change in color, and after about 2 hours, the redness of test paper is decorporated, residual gas is extracted out, and continue to keep 40 ℃ of temperature and vacuum drying state 4 ~ 5 hours, afterwards, make and recover normal pressure in the case, open drying box and take out test paper, and it is packed in the polybag by quantity, put into drying agent and antioxidant simultaneously, with plastic bag sealing.
Detection test paper to the embodiment 1 of prepared fresh carries out three colour developing experiments respectively under different formaldehyde, acetaldehyde concentration, experimental temperature is 25 ℃, and experimental result sees Table 1.
As can be seen, the detection test paper of embodiment 1 is unified at the color that identical concentration of formaldehyde shows, is convenient to make colorimetric card.
Present embodiment provides a kind of and detects the matching used standard formaldehyde of test paper colorimetric card with embodiment 1, and it is made by the following method: heat paraformaldehyde in the glass cabin, making and forming concentration of formaldehyde in the cabin is 2.0mg/m
3Atmosphere, put into the detection test paper of several embodiment 1 then by the pass-through box in glass cabin, close pass-through box, observed test paper change color situation every 1 hour, treat to be kept in the sealing bag standby as sample behind the colour stable; Obtain test paper respectively with same method and be respectively 1.5 mg/m at concentration of formaldehyde
3, 1.0 mg/m
3, 0.5 mg/m
3, 0.1 mg/m
3, 0.05 mg/m
3And 0 mg/m
3Atmosphere under the variable color sample, repeatedly test under the same concentration after the test paper variable color situation, according to sample, make standard formaldehyde colorimetric card.Referring to Fig. 1, this standard formaldehyde colorimetric card has 7 zones, and the concentration of formaldehyde that wherein is positioned at the white portion correspondence of the leftmost side is 0, and the corresponding successively from left to right concentration in other 6 zones is 0～0.1mg/m
30.1～0.5 mg/m
30.5～1.0 mg/m
31.0～1.5 mg/m
31.5～2.0 mg/m
3﹥ 2.0 mg/m
3, each regional color is the purple of deepening gradually from left to right.
Present embodiment provides a kind of and detects the matching used standard acetaldehyde of test paper colorimetric card with embodiment 1, and it is made by the following method: heat acetaldehyde solution in the glass cabin, making and forming acetaldehyde concentration in the cabin is 2.0mg/m
3Atmosphere, put into the detection test paper of several embodiment 1 then by the pass-through box in glass cabin, close pass-through box, observed test paper change color situation every 1 hour, treat to be kept in the sealing bag standby as sample behind the colour stable; Obtain test paper respectively with same method and be respectively 1.0 mg/m at acetaldehyde concentration
3, 0.5 mg/m
3, 0.05 mg/m
3And 0 mg/m
3Atmosphere under the variable color sample, repeatedly test under the same concentration after the test paper variable color situation, according to sample, make standard acetaldehyde colorimetric card.Referring to Fig. 2, this standard acetaldehyde colorimetric card has 4 zones, and the concentration of formaldehyde that wherein is positioned at the white portion correspondence of the leftmost side is 0～0.05 mg/m
3, the corresponding successively from left to right concentration in other 3 zones is 0.05～0.5 mg/m
30.5～1.0 mg/m
31.0～2.0 mg/m
3, each regional color is the redness of deepening gradually from left to right.
Present embodiment provides a kind of method that detects formaldehyde in the air, concrete enforcement is as follows: the detection test paper of getting embodiment 1, put into detected space, the color for the treatment of after 4 ~ 10 hours to observe test paper is by colourless when becoming lavender or darkviolet, with the standard formaldehyde colorimetric card contrast of embodiment 2, the data of reading concentration of formaldehyde.
Present embodiment provides a kind of method that detects acetaldehyde in the air, concrete enforcement is as follows: the detection test paper of getting embodiment 1, put into detected space, the color for the treatment of after 4 ~ 10 hours to observe test paper is by colourless when becoming pale red or carmetta, with the standard acetaldehyde colorimetric card contrast of embodiment 3, the data of reading acetaldehyde concentration.
Three months later embodiment 1 test paper are preserved in sealing, carried out three colour developing experiments respectively under different formaldehyde, acetaldehyde concentration, and contrast with standard color comparison card, experimental temperature is 25 ℃, and experimental result sees Table 2.
As seen from Table 2, the detection test paper of embodiment 1 is under the situation that sealing is preserved, and test paper can be preserved the long period and can not lose efficacy, if the preservation of longer time, drying agent and antioxidant are added in suggestion, and sealing.
Claims (9)
1. preparation method who is used to detect the detection test paper of formaldehyde and/or acetaldehyde, it is characterized in that: described preparation method comprises the steps:
(1), gets blank test paper, be impregnated in 50 ℃～70 ℃ the maceration extract of forming by basic fuchsin, citric acid and water, treat to take out after the abundant absorbent solution of test paper, place the vacuum drying chamber of 70 ℃～80 ℃ of temperature, dry by the fire to the test paper water cut be 30wt%～50wt%, take out test paper, be cut into the setting size, this moment, test paper took on a red color, in the described maceration extract, the concentration of basic fuchsin is 0.5 g/L～1.2 g/L, and the concentration of described citric acid is 1.2 g/L～1.5 g/L;
(2), will be positioned over through the test paper loosely of step (1) on the sieve plate in the vacuum drying chamber, vacuumize the back and in case, feed the mixed gas of forming according to mol ratio 87～93:5～10:2～3 by sulphuric dioxide, hydrogen chloride and water, under 20 ℃～30 ℃ of temperature, isothermal reaction is after the redness of test paper is decorporated, to vacuumize in the case, remain on 30 ℃～40 ℃ continuation of temperature vacuum drying and promptly got described detection test paper in 4～5 hours.
2. the preparation method of detection test paper according to claim 1 is characterized in that: in the described maceration extract of step (1), the concentration of basic fuchsin is 0.8 g/L～1.2 g/L.
3. a preparation method according to claim 1 and 2 prepares gained detection test paper, and it is characterized in that: described detection test paper is a strip, is of a size of 50 mm * 10mm～70 mm * 10mm.
4. the described detection test paper of claim 3 is used for detecting air concentration at 0 ~ 2mg/m
3The formaldehyde in the scope and/or the purposes of acetaldehyde.
One kind with the matching used standard formaldehyde of the described detection test paper of claim 3 colorimetric card, it is characterized in that: described formaldehyde colorimetric card prepares by the following method: heat paraformaldehyde in the glass cabin, make the formation concentration of formaldehyde is 2.0mg/m in the cabin in
3Atmosphere, put into the described detection test paper of several claims 3 by the pass-through box in glass cabin then, close pass-through box, observed test paper change color situation every 1 hour, treat to be kept in the sealing bag standby as sample behind the colour stable; Obtain test paper respectively with same method and be respectively 1.5 mg/m at concentration of formaldehyde
3, 1.0 mg/m
3, 0.5 mg/m
3, 0.1 mg/m
3, 0.05 mg/m
3And 0 mg/m
3Atmosphere under the variable color sample, repeatedly test under the same concentration after the test paper variable color situation, according to sample, make standard formaldehyde colorimetric card, this standard formaldehyde colorimetric card presents the different purple of the degree of depth.
In the air concentration at 0 ~ 2mg/m
3The detection method of the formaldehyde in the scope, it is characterized in that: the weighting profit requires 3 described detection test paper, put into detected space, the color for the treatment of after 4 ~ 10 hours to observe test paper is by colourless when becoming lavender or darkviolet, with the contrast of the described standard formaldehyde of claim 5 colorimetric card, the data of reading concentration of formaldehyde.
One kind with the matching used standard acetaldehyde of the described detection test paper of claim 3 colorimetric card, it is characterized in that: described acetaldehyde colorimetric card prepares by the following method: heat acetaldehyde solution in the glass cabin, make the formation acetaldehyde concentration is 2.0mg/m in the cabin in
3Atmosphere, put into the described detection test paper of several claims 3 by the pass-through box in glass cabin then, close pass-through box, observed test paper change color situation every 1 hour, treat to be kept in the sealing bag standby as sample behind the colour stable; Obtain test paper respectively with same method and be respectively 1.0 mg/m at acetaldehyde concentration
3, 0.5 mg/m
3, 0.05 mg/m
3And 0 mg/m
3Atmosphere under the variable color sample, repeatedly test under the same concentration after the test paper variable color situation, according to sample, make standard acetaldehyde colorimetric card, this standard acetaldehyde colorimetric card presents the different redness of the degree of depth.
In the air concentration at 0 ~ 2mg/m
3The detection method of the acetaldehyde in the scope, it is characterized in that: the weighting profit requires 3 described detection test paper, put into detected space, the color for the treatment of after 4 ~ 10 hours to observe test paper is by colourless when becoming pale red or carmetta, with the contrast of the described standard acetaldehyde of claim 7 colorimetric card, the data of reading acetaldehyde concentration.
9. the storage method of the described detection test paper of claim 3 is characterized in that: will detect the test paper sealing and be stored in the polybag that is added with antioxidant and drying agent.
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Cited By (6)
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| CN102978912A (en) * | 2012-11-19 | 2013-03-20 | 东华大学 | Preparation method of nanofiber membrane formaldehyde test paper |
| CN104076034A (en) * | 2014-07-17 | 2014-10-01 | 北京福德安科技有限公司 | RGB quantitative quick detecting test paper for formaldehyde residue in food |
| CN104251860A (en) * | 2013-06-28 | 2014-12-31 | 成都谱视科技有限公司 | Food safety testing analyzer based on intelligent terminal and testing method |
| CN107356592A (en) * | 2017-09-07 | 2017-11-17 | 合肥海正环境监测有限责任公司 | A kind of family expenses pump suction type air detecting device |
| CN111965174A (en) * | 2020-08-12 | 2020-11-20 | 武汉普利赛斯科技有限公司 | Preparation method of gonorrhea test paper |
| CN113984746A (en) * | 2021-10-21 | 2022-01-28 | 河南省奥瑞环保科技股份有限公司 | Method for preparing sulfur dioxide rapid gas detection tube by mixed carrier |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102978912A (en) * | 2012-11-19 | 2013-03-20 | 东华大学 | Preparation method of nanofiber membrane formaldehyde test paper |
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| CN104076034A (en) * | 2014-07-17 | 2014-10-01 | 北京福德安科技有限公司 | RGB quantitative quick detecting test paper for formaldehyde residue in food |
| CN107356592A (en) * | 2017-09-07 | 2017-11-17 | 合肥海正环境监测有限责任公司 | A kind of family expenses pump suction type air detecting device |
| CN111965174A (en) * | 2020-08-12 | 2020-11-20 | 武汉普利赛斯科技有限公司 | Preparation method of gonorrhea test paper |
| CN113984746A (en) * | 2021-10-21 | 2022-01-28 | 河南省奥瑞环保科技股份有限公司 | Method for preparing sulfur dioxide rapid gas detection tube by mixed carrier |
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