CN114635308A - High-aberration formaldehyde detection test paper based on natural pigments - Google Patents
High-aberration formaldehyde detection test paper based on natural pigments Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/50—Spraying or projecting
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/783—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour for analysing gases
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Abstract
The invention discloses natural pigment-based high-color-difference formaldehyde test paper which comprises white paper, an iodine simple substance, iodide ions, a water-soluble linear polymer and natural pigment. The test paper provided by the invention can react with formaldehyde, and simultaneously generates visible obvious color difference change from blue or purple brown to orange or yellow. The test paper provided by the invention can be used for detecting and indicating formaldehyde pollutants. Compared with the prior art, the invention has the following beneficial effects: the test paper is mainly based on natural substances, is friendly and safe to the home environment, has obvious color change to formaldehyde, can identify color difference change by visual observation, has simple and mild preparation process and low cost, and is convenient to carry and use.
Description
Technical Field
The invention belongs to the field of daily chemicals, and particularly relates to high-aberration formaldehyde detection test paper based on natural pigments.
Background
Modern scientific research shows that breathing natural and fresh air can promote blood circulation, eliminate fatigue, enhance immunity, enhance nervous system function and improve work efficiency; the foul air can cause dizziness, fatigue, vexation, lassitude, and inattention, and can also cause various diseases. Formaldehyde is a colorless gas with strong pungent odor, is one of the main pollutants of indoor environment, can destroy protoplasm poison of biological cell protein, and has potential carcinogenic harm to human body.
At present, methods for measuring formaldehyde by an instrument include gas chromatography and mass spectrometry, but the instrument is very expensive and is not suitable for household use; there is also a method in which a gas sample is enriched using a gas sampling tube, and then a color reaction is performed by a chemical reagent, and the measurement is performed by a spectrophotometer [ analytical laboratory, 2015, 34 (4): 447], but require the use of strong acids, bases and even strong oxidants [ spectroscopic laboratories, 2010, 27 (3): 881, which is inconvenient for on-site and home operations.
Test paper refers to a type of paper impregnated with chemicals that can be used to test for the presence of certain substances in liquids or gases by their color change. The test paper is suitable for field or field test and is convenient to carry, and special instruments and additional chemical reagents are not needed. The test paper has low price, the single detection cost can be controlled below 1 yuan, and if a professional indoor air pollution detection is required, hundreds of yuan is needed.
However, the above prior art has at least the following technical problems: there is no formaldehyde test paper with low price and convenient use in the market.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-color-difference formaldehyde test paper based on natural pigments.
The purpose of the invention is realized by the following technical scheme:
the high-color-difference formaldehyde detection test paper based on natural pigments comprises white paper, iodine simple substances, iodide ions, water-soluble linear polymers and natural pigments.
Further, the natural pigment-based high-aberration formaldehyde test paper is prepared by the following method: loading an indicator aqueous solution on white carrier paper in a soaking, coating, spraying or printing mode, and then drying to prepare the high-aberration formaldehyde test paper; the indicator aqueous solution contains 0.1-10 g/L of iodine simple substance, 2-30 g/L of iodine ions, 1-50 g/L of water-soluble linear polymer and 0.02-2 g/L of natural pigment.
Further, the indicator water solution is prepared by dissolving the raw materials in water according to a ratio, and fully mixing and dissolving the raw materials.
Further, the drying is preferably performed at 40 to 70 ℃.
Further, the white paper carrier is one or more of filter paper, rice paper, printing paper, copy paper and white newspaper.
Further, the iodide ion is derived from a compound containing I-The compound of (1), the compound containing-The cation in the compound is one or more of potassium, sodium, lithium and ammonium. Preferably, the iodide ion is derived from sodium iodide, potassium iodide or ammonium iodide.
When the dosage of the iodide ions is calculated, the iodide ions are added to the solution containing I-Of compounds (a) to (b)-Is measured.
Further, the water-soluble linear polymer is one or more of polyvinyl alcohol, polyvinylpyrrolidone, water-soluble starch, water-soluble cellulose, polyethylene glycol and polyacrylamide, and the polyvinyl alcohol, the water-soluble starch or the polyvinylpyrrolidone.
Further, the natural pigment is one or more of curcumin, capsanthin, beta-carotene, zeaxanthin and lycopene, and curcumin, capsanthin or beta-carotene is preferably selected.
Further, the invention also provides a preparation method of the natural pigment-based high-aberration formaldehyde test paper, which comprises the following steps: iodine simple substance containing I-The compound, the water-soluble linear polymer and the natural pigment are dissolved in water, fully mixed and dissolved to prepare an indicator aqueous solution containing 0.1-10 g/L of iodine simple substance, 2-30 g/L of iodine ions, 1-50 g/L of water-soluble linear polymer and 0.02-2 g/L of natural pigment, the indicator aqueous solution is loaded on white paper by soaking, coating, spraying or printing, and the white paper is dried at 40-70 ℃ to prepare the high-color-difference formaldehyde detection test paper.
The high-color-difference formaldehyde test paper provided by the invention can react with formaldehyde, and simultaneously generates visible obvious color difference change, namely changing from blue or purple brown to orange or yellow, so that the high-color-difference formaldehyde test paper can be used for detecting and indicating formaldehyde pollutants.
The color change principle of the high-color-difference formaldehyde test paper is as follows:
iodine simple substance I2And I-Co-formation of polyiodide ions (I) in solutionn -) After the water-soluble linear polymer is dissolved in water, the water-soluble linear polymer is curled into a spiral shape by virtue of intramolecular hydrogen bonds, at the moment, polyiodide ions can enter a spiral middle cavity, a one-dimensional supramolecular assembly is formed under the coordination bond action of polymer hydroxyl (providing lone pair electrons) and iodine (providing empty orbitals), and the electron delocalization effect of the polyiodide ions in the one-dimensional assembly is enhanced, so that the absorption spectrum of the polyiodide ions is red-shifted to be blue or brownish-purple. The supramolecular assembly has darker color in the test paper, so that the natural pigment background color in the test paper can be covered.
When the supermolecule assembly meets formaldehyde molecules which are air pollutants, polyiodide ions can oxidize formaldehyde and are reduced into iodide ions, so that the assembly is disintegrated and faded (as shown in figure 1), and the color of natural pigment in the test paper is shown. In order to obtain a more obvious color vision contrast effect before and after the formaldehyde reaction, the choice of the natural pigment which gives the background color to the test paper is mainly the complementary color (orange or yellow) of blue or purple of the color of the supramolecular assembly. The molecular structure of the optional natural pigment is shown in figure 2.
Further, when the white paper carrier is white printing paper or copy paper, starch is usually added into the printing paper or copy paper during manufacturing, and the paper contains a starch component, namely a water-soluble linear polymer component, so that when the white printing paper or copy paper contains the starch, the starch in the white printing paper or copy paper can be discolored with the polyiodide ions, and the effect of the water-soluble linear polymer is achieved. Therefore, when white printing paper or copy paper containing starch is used as the carrier paper, the water-soluble linear polymer can be not added additionally.
Specifically, the invention also provides high-aberration formaldehyde test paper based on natural pigments, which takes white printing paper or copy paper as white paper, and is prepared from iodine simple substances, iodide ions and natural pigments according to the following method: loading the indicator solution on white printing paper or copy paper in a soaking, coating, spraying or printing mode, and then drying to prepare the high-aberration formaldehyde test paper; the indicator solution contains 0.1-10 g/L of iodine simple substance, 2-30 g/L of iodide ions and 0.02-2 g/L of natural pigment, and the solvent is water.
The white printing paper or the copy paper is printing paper or copy paper containing starch; the white printing paper or copy paper becomes blue or brownish-purple after being loaded with the indicator solution.
The definition of iodine, iodine ion and natural pigment is as described above.
In industry and commerce, color evaluation may be different due to various factors such as a light source, an observation angle, and an observer's own condition when visually measuring color, and the international commission on illumination (CIE) recommends accurate evaluation of product color difference based on a Lab color space as a measurement standard. Processing each color into a point (L, a, b) in a three-dimensional space by comparing the color difference between the sample plate and the detected object by using a color difference meter according to the following standard color difference formula provided by CIE, and then calculating the Euclidean space distance between the points to obtain a color difference value (delta E):
because the colors before and after the formaldehyde changes color are in a relative complementary color relationship (figure 3), the test paper can obtain a larger color difference value (delta E is more than or equal to 30) and obtain better visual sensitivity.
Compared with the prior art, the invention has the following beneficial effects: the formaldehyde detection test paper is mainly based on natural substances, is friendly and safe to the home environment, has obvious color change to formaldehyde, can identify color difference change by visual observation, and has the advantages of simple and mild preparation process, low cost and convenient carrying and use.
Drawings
FIG. 1 is a schematic diagram of the principle of formation of one-dimensional supramolecular assemblies and formaldehyde discoloration.
FIG. 2 shows the molecular structure of natural pigments.
FIG. 3 is the relationship of color complementation before and after formaldehyde discoloration.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications, including any combination of examples, may occur to those skilled in the art without departing from the spirit of the invention.
Example 1
A high-color-difference formaldehyde test paper based on natural pigments comprises filter paper, iodine simple substances, potassium iodide, polyvinyl alcohol and curcumin.
The preparation steps are as follows: preparing an indicator aqueous solution, wherein the indicator aqueous solution contains 2g/L of iodine simple substance, 10g/L of iodine ions, 10g/L of polyvinyl alcohol and 0.5g/L of curcumin, and fully mixing and dissolving to obtain the indicator aqueous solution. And (3) uniformly loading the indicator aqueous solution on filter paper in a soaking mode and drying at 60 ℃ to obtain the high-aberration formaldehyde detection test paper.
The test paper is placed in an air detection cabin, under the condition that the concentration of formaldehyde is 2mg/L, the color of the test paper is changed from blue to yellow by visual observation after 24 hours, and the color difference delta E value before and after color change is measured by a color difference instrument to be 116.5, so that the obvious formaldehyde color change effect is achieved.
The test paper is placed in an air detection cabin, under the condition that the concentration of formaldehyde is 0.08mg/L, the color of the test paper is changed from blue to light yellow after 24 hours, the color difference delta E value before and after color change is measured by a color difference instrument to be 62.3, and the obvious visual color change effect is achieved.
Example 2
A high-color-difference formaldehyde test paper based on natural pigments comprises rice paper, iodine simple substance, sodium iodide, polyvinylpyrrolidone and capsanthin.
The preparation steps are as follows: preparing an indicator aqueous solution, wherein the indicator aqueous solution contains 10g/L of iodine simple substance, 30g/L of iodide ions, 50g/L of polyvinylpyrrolidone and 2g/L of capsanthin, and fully mixing and dissolving to obtain the indicator aqueous solution. And (3) uniformly loading the indicator aqueous solution on the rice paper in a coating mode and drying at 40 ℃ to obtain the high-aberration formaldehyde test paper.
The test paper is placed in an air detection cabin, under the condition that the concentration of formaldehyde is 2mg/L, the color of the test paper is changed from brown purple to orange yellow after 24 hours, the color difference delta E value before and after color change is measured by a color difference instrument to be 95.1, and the obvious visual color change effect is achieved.
Example 3
A high-color difference formaldehyde test paper based on natural pigment comprises commercial printing paper (containing 3 mass percent of water-soluble starch), iodine simple substance, ammonium iodide and beta-carotene.
The preparation steps are as follows: preparing an indicator aqueous solution, wherein the indicator aqueous solution contains 0.1g/L of iodine simple substance, 2g/L of iodide ions and 0.02g/L of beta-carotene, and fully mixing and dissolving to obtain the indicator aqueous solution. And (3) uniformly loading the indicator aqueous solution on commercial printing paper in a spraying manner and drying at 70 ℃ to obtain the high-aberration formaldehyde detection test paper.
The test paper is placed in an air detection cabin, under the condition that the concentration of formaldehyde is 2mg/L, the color of the test paper is changed from brown purple to orange yellow after 24 hours, the color difference delta E value before and after color change is measured by a color difference instrument to be 58.0, and the obvious visual color change effect is achieved.
Comparative example 1
A formaldehyde test paper comprises filter paper, a simple substance of iodine, potassium iodide and polyvinyl alcohol.
The preparation steps are as follows: preparing an indicator aqueous solution, wherein the solution contains 2g/L of iodine simple substance, 10g/L of iodide ions and 10g/L of polyvinyl alcohol, and fully mixing and dissolving to obtain the indicator aqueous solution. And (3) uniformly loading the indicator aqueous solution on filter paper in a soaking mode and drying at 60 ℃ to obtain the formaldehyde detection test paper.
The test paper is placed in an air detection cabin, under the condition that the concentration of formaldehyde is 2mg/L, after 24 hours, the color of the test paper is only slightly faded from blue by visual observation, the color difference delta E value before and after color change is only 13.3 by a color difference meter, and the visual color change effect is not obvious.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The high-color-difference formaldehyde test paper based on natural pigments is characterized by comprising white paper, iodine simple substances, iodide ions, water-soluble linear polymers and natural pigments.
2. The natural pigment-based high-color-difference formaldehyde test paper according to claim 1, wherein the natural pigment-based high-color-difference formaldehyde test paper is prepared by the following method: loading an indicator aqueous solution on white paper by soaking, coating, spraying or printing, and then drying to prepare the high-aberration formaldehyde test paper; the indicator aqueous solution contains 0.1-10 g/L of iodine simple substance, 2-30 g/L of iodide ions, 1-50 g/L of water-soluble linear polymer and 0.02-2 g/L of natural pigment.
3. The natural pigment-based high-color-difference formaldehyde test paper according to claim 1, wherein the white paper carrier is one or more of filter paper, rice paper, printing paper, copy paper and white newspaper.
4. The natural pigment-based high-aberration formaldehyde test paper according to claim 1, wherein the iodide ion is derived from group I-The compound of (1), the compound containing-The cation in the compound is one or more of potassium, sodium, lithium and ammonium.
5. The natural pigment-based high-color-difference formaldehyde test paper according to claim 1, wherein the water-soluble linear polymer is one or more of polyvinyl alcohol, polyvinylpyrrolidone, water-soluble starch, water-soluble cellulose, polyethylene glycol and polyacrylamide.
6. The natural pigment-based high-color-difference formaldehyde test paper according to claim 1, wherein the natural pigment is one or more of curcumin, capsanthin, beta-carotene, zeaxanthin and lycopene.
7. The natural pigment-based high-color-difference formaldehyde test paper according to any one of claims 1 to 6, wherein the test paper reacts with formaldehyde to produce a visually obvious color difference change from blue or purple brown to orange or yellow.
8. The use of the natural pigment-based high-color-difference formaldehyde test paper according to any one of claims 1 to 6 for detecting and indicating formaldehyde pollutants.
9. The high-chromatic-aberration formaldehyde detection test paper based on natural pigments is characterized in that white printing paper or copy paper is used as white paper, and iodine simple substances, iodide ions and natural pigments are prepared according to the following method: loading the indicator solution on white printing paper or copy paper in a soaking, coating, spraying or printing mode, and then drying to prepare the high-aberration formaldehyde test paper; the indicator solution contains 0.1-10 g/L of iodine simple substance, 2-30 g/L of iodonium and 0.02-2 g/L of natural pigment, and the solvent is water; the white printing paper or the copy paper is printing paper or copy paper containing starch.
10. Use of the natural pigment-based high-color-difference formaldehyde test paper of claim 9 for detecting and indicating formaldehyde contaminants.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0772137A (en) * | 1993-09-03 | 1995-03-17 | Ishikawajima Harima Heavy Ind Co Ltd | Gas exposure indicator and preservation container thereof |
| EP0916946A2 (en) * | 1997-11-12 | 1999-05-19 | Integrated Biomedical Technology, Inc. | Peroxide and chlorine test strip |
| JP2002277453A (en) * | 2001-03-15 | 2002-09-25 | Seiko Epson Corp | Test paper |
| US20030212176A1 (en) * | 2002-04-25 | 2003-11-13 | Wang Danli | Iodine/iodide-containing hot melt coatable adhesive, methods and uses therefor |
| CN1563954A (en) * | 2004-04-15 | 2005-01-12 | 上海交通大学 | Fast detecting test. paper for formaldhyde in air |
| JP2005274287A (en) * | 2004-03-24 | 2005-10-06 | Tokai Univ | Formaldehyde detection material and its manufacturing method |
| CN104931489A (en) * | 2015-05-17 | 2015-09-23 | 桂林理工大学 | Quantitative analysis method for measuring rapid test strip on basis of iodine-starch variable-color distance |
| US20160069919A1 (en) * | 2011-09-25 | 2016-03-10 | Theranos, Inc. | Systems and methods for multi-analysis |
| US20160077013A1 (en) * | 2013-10-21 | 2016-03-17 | Amir James Attar | Laminated Detector for Detection and Quantitative Determination of Formaldehyde |
-
2022
- 2022-03-28 CN CN202210313773.XA patent/CN114635308B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0772137A (en) * | 1993-09-03 | 1995-03-17 | Ishikawajima Harima Heavy Ind Co Ltd | Gas exposure indicator and preservation container thereof |
| EP0916946A2 (en) * | 1997-11-12 | 1999-05-19 | Integrated Biomedical Technology, Inc. | Peroxide and chlorine test strip |
| JP2002277453A (en) * | 2001-03-15 | 2002-09-25 | Seiko Epson Corp | Test paper |
| US20030212176A1 (en) * | 2002-04-25 | 2003-11-13 | Wang Danli | Iodine/iodide-containing hot melt coatable adhesive, methods and uses therefor |
| JP2005274287A (en) * | 2004-03-24 | 2005-10-06 | Tokai Univ | Formaldehyde detection material and its manufacturing method |
| CN1563954A (en) * | 2004-04-15 | 2005-01-12 | 上海交通大学 | Fast detecting test. paper for formaldhyde in air |
| US20160069919A1 (en) * | 2011-09-25 | 2016-03-10 | Theranos, Inc. | Systems and methods for multi-analysis |
| US20160077013A1 (en) * | 2013-10-21 | 2016-03-17 | Amir James Attar | Laminated Detector for Detection and Quantitative Determination of Formaldehyde |
| CN104931489A (en) * | 2015-05-17 | 2015-09-23 | 桂林理工大学 | Quantitative analysis method for measuring rapid test strip on basis of iodine-starch variable-color distance |
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