CN104101575A - Gel film used for detecting formaldehyde gas and preparation method of gel film - Google Patents
Gel film used for detecting formaldehyde gas and preparation method of gel film Download PDFInfo
- Publication number
- CN104101575A CN104101575A CN201410365666.7A CN201410365666A CN104101575A CN 104101575 A CN104101575 A CN 104101575A CN 201410365666 A CN201410365666 A CN 201410365666A CN 104101575 A CN104101575 A CN 104101575A
- Authority
- CN
- China
- Prior art keywords
- gel film
- solution
- gas
- preparation
- formaldehyde gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a gel film used for detecting formaldehyde gas. The preparation method of the gel film comprises the following steps: firstly, adopting an alkaline solution of benzenetriol as a color-developing agent; immobilizing the alkaline solution in a polyving akohol film to form the gel film. When the gel film is placed in the gas to be detected, a color-developing reaction can be performed on the benzenetriol in the gel film and the formaldehyde gas; detection for the content of formaldehyde in the gas can be realized by measuring absorption peak strength of the color-developing gel film at 474 nm.
Description
Technical field
The present invention relates to analyzing and testing field, be specifically related to a kind of gel film detecting for formaldehyde gas and preparation method thereof.
Background technology
Formaldehyde is the carcinogenic and teratogen of the one pointed out of the World Health Organization (WHO), and the nervous system to human body, lung, liver all can produce infringement, and the content of formaldehyde therefore accurately, in quick test room air is significant.At present, Analysis Methods for Formaldehyde is mainly laboratory chemical analysis, as vapor-phase chromatography, high performance liquid chromatography, acetylacetone method etc., analyzes by taking back laboratory after collection in worksite gaseous sample.Need expensive human and material resources and financial resources for obtaining experimental result accurately, and this method program complexity and the sample preparation time cycle long.On market, not only price is high, volume is large for existing in-situs tester, and all adopts and gas is passed into absorption liquid sample, and cannot realize the direct test of formaldehyde gas.
Summary of the invention
The object of this invention is to provide a kind of gel film that can direct-detection formaldehyde gas.Overcome the measuring process complexity that prior art exists, Measuring Time is long, and expense is high, cannot directly carry out the shortcoming of gas detection.
The gel film detecting for formaldehyde gas of the present invention is that alkaline solution taking benzenetriol is as developer, by its immobilized gel film that forms in polyvinyl alcohol film.This gel film is placed in to gas to be measured, and the benzenetriol in gel film can carry out chromogenic reaction with formaldehyde gas, realizes the content that detects formaldehyde in gas by the measurement gel film that develops the color in the absorption peak strength at 474nm place.The preparation method of gel film is: be 1700-1800 by the degree of polymerization, alcoholysis degree is the granule of polyvinyl alcohol of 80-90%, under constantly stirring, join massfraction concentration and be in 70% dimethyl sulphoxide solution, the mass ratio of polyvinyl alcohol (PVA) and dimethyl sulphoxide solution is 1:4～1:6, be heated to 90 DEG C, under constantly stirring, fully dissolve, form transparent colloidal solution, stop stirring, leave standstill constant temperature 2～2.5 hours, it is in the ceramic matrix mould of 2 millimeters that colloidal sol is poured into a degree of depth, put into refrigerator, at-20 DEG C freezing 10 hours, then take out and at room temperature thaw 2～3 hours.Polyvinyl alcohol gel after freeze-thaw is put into the deionized water of 500 milliliters, in 36 DEG C of constant water bath box, fully soak 1～2 hour, take out and at the temperature of 108 DEG C, dry 1～2 hour, cooling rear immersion PH=13, concentration is in the benzenetriol solution of 0.02mol/L, leave standstill 0.5～1 hour at 36 DEG C of constant temperature, take out and remove surface solution with filter paper, obtain formaldehyde colour developing gel film.
The present invention has following distinguishing feature:
(1) inventing described gel film can directly react with formaldehyde gas, and reaction velocity is fast, and test is simple, and easy operating is convenient and swift;
(2) inventing described gel film thickness is only 2-3 millimeter, and volume is little, easy to carry, and testing cost is low, and can realize on-the-spot test;
(3) invent described gel film stable performance, the life-span is long, can preserve for a long time use.
embodiment:
Implement example:
Be 1750 by the degree of polymerization, alcoholysis degree is 80% granule of polyvinyl alcohol, under constantly stirring, join massfraction concentration and be in 70% dimethyl sulphoxide solution, the mass ratio of polyvinyl alcohol (PVA) and dimethyl sulphoxide solution is 1:4, be heated to 90 DEG C, under constantly stirring, fully dissolve, form transparent colloidal solution, stop stirring, leave standstill constant temperature 2 hours, it is in the ceramic matrix mould of 2 millimeters that colloidal sol is poured into a degree of depth, is cooled to room temperature, puts into refrigerator, at-20 DEG C freezing 10 hours, then take out and at room temperature thaw 2 hours.Polyvinyl alcohol gel after freeze-thaw is put into the deionized water of 500 milliliters, in 36 DEG C of constant water bath box, fully soak 2 hours, take out and at the temperature of 108 DEG C, dry 1 hour, cooling rear immersion pH=13, concentration is in the benzenetriol solution of 0.02mol/L, leave standstill 1 hour at 36 DEG C of constant temperature, take out and remove surface solution with filter paper, obtain gel film.
Application: this gel film is placed in to the container that contains a certain amount of formaldehyde gas, carries out chromogenic reaction with formaldehyde gas, the gel film after developing the color by measurements is realized the content of formaldehyde in detection gas in the absorption peak strength at 474nm place.
Claims (2)
1. the present invention relates to a kind of formaldehyde gas testing product and preparation method thereof, it is characterized in that: alkaline solution and the polyvinyl alcohol (PVA) of benzenetriol are compounded to form gel film, this gel film is placed in to gas to be measured, carry out chromogenic reaction with formaldehyde gas, the gel film after developing the color by measurement realizes in the absorption peak strength at 474nm place the content that detects formaldehyde in gas, the preparation method of gel film is: be 1700-1800 by the degree of polymerization, alcoholysis degree is that under constantly stirring, to join massfraction concentration be in 70% dimethyl sulphoxide solution to the granule of polyvinyl alcohol of 80-90%, the mass ratio of polyvinyl alcohol (PVA) and dimethyl sulphoxide solution is 1:4～1:6, be heated to 90 DEG C, under constantly stirring, fully dissolve, form transparent colloidal solution, stop stirring, leave standstill constant temperature 2～2.5 hours, it is in the ceramic matrix mould of 2 millimeters that colloidal sol is poured into a degree of depth, put into refrigerator, at-20 DEG C freezing 10 hours, then take out and at room temperature thaw 2～3 hours, polyvinyl alcohol gel after freeze-thaw is put into the deionized water of 500 milliliters, in 36 DEG C of constant water bath box, fully soak 1～2 hour, take out and at the temperature of 108 DEG C, dry 1～2 hour, cooling rear immersion PH=13, concentration is in the benzenetriol solution of 0.02mol/L, leave standstill 0.5～1 hour at 36 DEG C of constant temperature, take out and remove surface solution with filter paper, obtain formaldehyde gas detection gel film.
2. require described formaldehyde gas testing product and preparation method thereof according to power 1, it is characterized in that: benzenetriol solution NaOH regulates PH=13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410365666.7A CN104101575A (en) | 2014-07-29 | 2014-07-29 | Gel film used for detecting formaldehyde gas and preparation method of gel film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410365666.7A CN104101575A (en) | 2014-07-29 | 2014-07-29 | Gel film used for detecting formaldehyde gas and preparation method of gel film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104101575A true CN104101575A (en) | 2014-10-15 |
Family
ID=51669905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410365666.7A Pending CN104101575A (en) | 2014-07-29 | 2014-07-29 | Gel film used for detecting formaldehyde gas and preparation method of gel film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104101575A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823774A (en) * | 2016-03-22 | 2016-08-03 | 河北安捷仑生物科技有限公司 | Rapid detection method for formaldehyde in food |
| CN108514867A (en) * | 2018-04-18 | 2018-09-11 | 北京化工大学 | A kind of preparation of the sodium alginate gel ball of detection formaldehyde |
| CN113189090A (en) * | 2021-03-19 | 2021-07-30 | 四川轻化工大学 | Visual formaldehyde detection gel chip, portable formaldehyde detection device and preparation method thereof |
-
2014
- 2014-07-29 CN CN201410365666.7A patent/CN104101575A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823774A (en) * | 2016-03-22 | 2016-08-03 | 河北安捷仑生物科技有限公司 | Rapid detection method for formaldehyde in food |
| CN105823774B (en) * | 2016-03-22 | 2018-12-21 | 河北安捷仑生物科技有限公司 | Formaldehyde in food rapid detection method |
| CN108514867A (en) * | 2018-04-18 | 2018-09-11 | 北京化工大学 | A kind of preparation of the sodium alginate gel ball of detection formaldehyde |
| CN113189090A (en) * | 2021-03-19 | 2021-07-30 | 四川轻化工大学 | Visual formaldehyde detection gel chip, portable formaldehyde detection device and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3575781A3 (en) | Test strips and method for reading test strips | |
| IN2014MN01698A (en) | ||
| CN104101575A (en) | Gel film used for detecting formaldehyde gas and preparation method of gel film | |
| IN2012DN02872A (en) | ||
| CN108776132A (en) | The simple test paper of ammonia and its preparation and assay method in a kind of measurement air | |
| CN104535712A (en) | Test paper for rapidly testing nitrite and standard colourimetric card and application of test paper | |
| CN103901015A (en) | Method for simultaneously detecting thiocyanate radical and melamine in dairy products | |
| CN104089955A (en) | Gel thin film for detecting benzene gas and production method thereof | |
| WO2009072441A1 (en) | Detection method and detection kit | |
| CN104101574A (en) | Gel thin film for sulfur dioxide gas detection and preparation method of gel thin film | |
| CN102967588A (en) | Formaldehyde fluorescence detector | |
| CN102213678A (en) | Sulfite detection test paper and preparation method thereof | |
| CN104122256A (en) | Gel film for detecting styrene gas and preparation method of gel film | |
| CN104297234A (en) | Preparation methods of color developing agent and test paper for testing boric acid and borax | |
| CN105388142A (en) | Method for detecting silicon content in titanium sponge, titanium and titanium alloy | |
| CN104101597A (en) | Gel thin film for detecting ammonia gas | |
| JP2008523414A5 (en) | ||
| CN201681070U (en) | New-generation rapid food physical and chemical detection case | |
| CN203310759U (en) | Rapid detecting test paper for residual chlorine in water | |
| CN104142398A (en) | Colloidal gold test card for detection of rhodamine B and preparation method and application thereof | |
| CN104076032A (en) | Method for measuring ammonia nitrogen in seawater | |
| CN103245658B (en) | The method for quick of bromate in a kind of bread | |
| CN204302280U (en) | A kind of volatile harmful material content detection equipment used for textiles | |
| MY164288A (en) | Method for quantitatively detecting 8-oxo 2'-deoxyguanosine in aqueous sample solution with high sensitivity | |
| Flynn et al. | Small defect detection through local analysis of acoustic spatial wavenumber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141015 |
|
| WD01 | Invention patent application deemed withdrawn after publication |