CN101029870A - Methanal fast-inspecting reagent unit and its production - Google Patents
Methanal fast-inspecting reagent unit and its production Download PDFInfo
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- CN101029870A CN101029870A CN 200610057924 CN200610057924A CN101029870A CN 101029870 A CN101029870 A CN 101029870A CN 200610057924 CN200610057924 CN 200610057924 CN 200610057924 A CN200610057924 A CN 200610057924A CN 101029870 A CN101029870 A CN 101029870A
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Abstract
A kit used for quickly detecting out methanal is composed of prop carried with strong base, color development reagent and colorimetric card. Its applying method includes dropping color development reagent on strong base region of prop and exposing it at environment to be detected for few minutes then comparing color of said kit with colorimetric card for determining out concentration of methanal.
Description
Affiliated technical field:
A kind of methanal fast-inspecting reagent unit and preparation method thereof is used for on-the-spot semi-quantitative analysis and detects airborne concentration of formaldehyde, also can be used for detecting the formaldehyde volatile quantity of furniture, finishing material.Be that on-the site analysis detects new product.
Background technology:
Formaldehyde is a kind of colourless easily molten irritative gas, insalubrity, and public attention extremely in recent years, national regulation indoor formaldehyde content must not be greater than 0.08mg/m
3Fast detecting formaldehyde pollutes for control formaldehyde, helps protecting people ' s health, and good social effect is arranged.
Detect method more existing reports in patent documentation of formaldehyde.Chinese patent publication number 1437020A, Chinese patent grant number 2572399Y, 2 577278Y disclose several formaldehyde detection methods, there are several problems in this several method: 1) detection time is long, need in air, expose 30 minutes to a few hours, 2) complex operation, 3) the manufacturing cost height.
4-amino-3-hydrazine-5-sulfydryl-1,2,4-triazole (be called for short AHMT) under alkali condition with formaldehyde condensation, oxidation generates the aubergine compound then, its shade is directly proportional with content of formaldehyde, so can be used for detecting content of formaldehyde.This principle of utilizing State Standard of the People's Republic of China GB/T 16129-1995 adopts spectrophotometer method to measure content of formaldehyde.
Chinese patent publication number 1563954A discloses formaldehyde repid test test paper in a kind of air, and it 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.
U.S. Pat 4511658 disclosed methods are: form the supercarbonate precipitation earlier on solid support, use organic ketone solution (as acetone soln) of AHMT to handle the supercarbonate precipitation again, be exposed to then in the air, detect airborne concentration of formaldehyde.The major defect of the method is that detection sensitivity is low, and its minimum formaldehyde detection limit is greater than 0.08mg/m
3, can not satisfy the demand that detects content of formaldehyde in the room air.
The content of invention:
The objective of the invention is deficiency, propose a kind of quick, sensitive formaldehyde detection method at U.S. Pat 4511658.This method is that highly basic (as NaOH, potassium hydroxide etc.) is loaded on the holder, and AHMT is dissolved in (abbreviation developer) in the acidic aqueous solution.During use developer is dropped in the zone that is loaded with highly basic on the holder, after the highly basic reaction on developer and the holder, AHMT becomes alkalescence, AHMT and formaldehyde condensation under alkali condition, and oxidation generates the aubergine compound then.The shade that drips the developer zone on the holder is directly proportional with content of formaldehyde, contrasts the content of formaldehyde that can draw in environment or the sample according to shade and colorimetric card.
Because the alkalescence of highly basic is better than supercarbonate, AHMT is under the condition that highly basic exists, the sensitivity and the reaction velocity of itself and formaldehyde reaction and variable color improve greatly, and because the solubleness of AHMT in acidic aqueous solution is higher than the solubleness of AHMT in organic ketone far away, also help improving sensitivity, through the improvement of above two aspects, the sensitivity that this method detects formaldehyde improves greatly, only needs 2 to 10 minutes detection time.
Specific embodiments:
The present invention relates to a kind of methanal fast-inspecting reagent unit, form by the holder that is loaded with highly basic, developer and colorimetric card, holder can be test paper, test piece, examination box, examination ware, test tube, holder can be but be not limited to paper, cloth, cotton, nonwoven fabrics, sponge, best holder is a filter paper, highly basic is loaded in method on the holder, can be strong base solution to be added on the holder or with strong base solution soak holder, the holder that is loaded with highly basic can be moistening, but the best holder that is loaded with highly basic is dry.Highly basic can be but be not limited to NaOH, potassium hydroxide, lithium hydroxide, beryllium hydroxide, calcium hydroxide, magnesium hydroxide, most economical highly basic is NaOH and potassium hydroxide, the concentration of strong base solution can be at 0.1M between the saturated solution, and the optium concentration of strong base solution is 2 to 5M
Developer is the acidic aqueous solution of AHMT, the concentration of AHMT is at 5mM to 200mM, the optium concentration of AHMT is 20mM to 100mM, the acidity of developer is provided by hydrochloric acid, sulfuric acid, phosphoric acid or other acid solution and keeps, for developer provides acid optimisation substance is hydrochloric acid, the pH of developer is between 1 to 6, and the best pH of developer is 2 to 4.Developer is packaged in the container, container can be but be not limited to dark or lighttight container that can dropwise extrude developer with the hand squeeze receptacle, best developer packing container is the plastics tubule, tubule can have elongated bottleneck, be convenient to repeated open, and with after seal.
The amount of highly basic has relation on the acidity of developer and the holder, and after developer dropped on the holder, the highly basic of holder need change over strong basicity by acidity with developer.Holder is loaded with the equivalent of highly basic need be greater than the equivalent of developer middle acid substance.
Detect the sample of a series of known concentration of formaldehyde, make colorimetric card with color that detects the back kit or the corresponding known concentration of formaldehyde of photo, and provide the maximum concentration that national standard allows.
Holder can be placed a reaction vessel, reaction vessel can be but be not limited to try box, examination ware, test tube, open-top receptacle, the ratio of the degree of depth of container and girth was at 1: 50 to 2: 1, the optimum depth of container is 1: 30 to 1: 7 with the ratio of girth, be provided with stationary installation in the reaction vessel, holder can be fixed in the container, optimum fixation position is that holder is fixed on container bottom, and fixedly the mode of holder can be but be not limited to utilize projection, tongue, the groove of reaction vessel.
This reagent can also be used to detecting furniture or fits up the formaldehyde volatilization degree of using material, using method is as follows: behind the holder dropping developer that is fixed on the container, immediately with uncovered furniture or the finishing material surface of preparing detection that be buckled in downwards of reaction vessel, according to the volume of reaction vessel, can calculate the formaldehyde volatile quantity of determinand.Can use the area number of the material of measuring and monitoring the growth of standing timber to be marked on the colorimetric card together formaldehyde volatile quantity and every square metre of usable floor area of general housing.
Example 1,
Preparation 20% potassium hydroxide solution is dipped in filter paper in 20% the potassium hydroxide solution fully, takes out after 5 minutes, dries for 80 ℃, and filter paper is cut into the square small pieces of 2 centimetres of the length of sides, and this is holder, and is standby.The hydrochloric acid solution of preparation 0.5M takes by weighing 0.5 gram ANHT, and the 0.5M dissolve with hydrochloric acid solution 0.5 gram ANHT with trying one's best few adds distilled water to 50ml, and this developer is divided in the tiny plastic jar of opening.Holder is put into the environment of known concentration of formaldehyde, developer is dripped in central authorities at filter paper, take out after 5 minutes, make colorimetric card according to the color of filter paper central authorities and corresponding concentration of formaldehyde, the filter paper after maybe will detecting is taken a picture immediately and is marked corresponding concentration of formaldehyde and makes colorimetric card.Holder is put into environment to be measured, and developer is dripped in central authorities at filter paper, takes out after 5 minutes, and the contrast ratio colour atla just can draw the concentration of formaldehyde of environment to be measured.This example can detect 0.04mg/m
3Formaldehyde be lower than the maximum concentration of formaldehyde of the indoor permission of national regulation.
Example 2,
Preparation 18% sodium hydroxide solution is cut into the sequin of 2 centimetres of diameters with thieving paper, the thieving paper small pieces is dipped in fully in 18% the sodium hydroxide solution, takes out after 2 minutes, dries for 80 ℃, and this is a holder, packages spare.The hydrochloric acid solution of preparation 0.5M takes by weighing 0.35 gram ANHT, and the 0.5M dissolve with hydrochloric acid solution 0.35 gram ANHT with trying one's best few adds distilled water to 50ml, and this developer is divided in the tiny plastic jar of opening.Holder is put into the environment of known concentration of formaldehyde, developer is dripped in central authorities at holder, take out after 5 minutes, make colorimetric card according to the color of holder central authorities and corresponding concentration of formaldehyde, the holder after maybe will detecting is taken a picture immediately and is marked corresponding concentration of formaldehyde and makes colorimetric card.Holder is put into environment to be measured, and developer is dripped in central authorities at holder, takes out after 5 minutes, and the contrast ratio colour atla just can draw the concentration of formaldehyde of environment to be measured.
Example 3,
Preparation 22% sodium hydroxide solution is cut into the sequin of 2 centimetres of diameters with calico, the calico small pieces is dipped in fully in 22% the sodium hydroxide solution, takes out after 5 minutes, dries for 80 ℃, and this is a holder, packages spare.The sulfuric acid solution of preparation 0.5M takes by weighing 0.35 gram ANHT, and the 0.5M sulfuric acid solution dissolving 0.35 gram ANHT with trying one's best few adds distilled water to 50ml, and this developer is divided in the tiny plastic jar of opening.Holder is put into the environment of known concentration of formaldehyde, developer is dripped in central authorities at holder, take out after 5 minutes, make colorimetric card according to the color of holder central authorities and corresponding concentration of formaldehyde, the holder after maybe will detecting is taken a picture immediately and is marked corresponding concentration of formaldehyde and makes colorimetric card.Holder is put into environment to be measured, and developer is dripped in central authorities at holder, takes out after 5 minutes, and the contrast ratio colour atla just can draw the concentration of formaldehyde of environment to be measured.
Example 4,
Preparation 18% sodium hydroxide solution is cut into little side's sheet of 1.5 centimetres of the length of sides with filter paper, the filter paper small pieces is dipped in fully in 18% the sodium hydroxide solution, takes out after 5 minutes, dries for 80 ℃, and this is a holder.Uncovered side's ware of 1.5 centimetres high 0.5 centimetre of the length of side in making with plastics, each stretches out a projection in square ware from the end 0.1 centimeters at uncovered side's ware four jiaos, holder is stuck in the bottom of uncovered side's ware with these four projectioies.The hydrochloric acid solution of preparation 0.5M takes by weighing 0.35 gram ANHT, and the 0.5M dissolve with hydrochloric acid solution 0.35 gram ANHT with trying one's best few adds distilled water to 50ml, and this developer is divided in the tiny plastic jar of opening.Holder is put into the environment of known concentration of formaldehyde, developer is dripped in central authorities at holder, take out after 5 minutes, make colorimetric card according to the color of holder central authorities and corresponding concentration of formaldehyde, the holder after maybe will detecting is taken a picture immediately and is marked corresponding concentration of formaldehyde and makes colorimetric card.
The clear height of normal room generally is 2.6 meters, the reaction vessel clear height of this example equals 0.005 meter for 5 millimeters, the room air standard of national regulation is to close door to close window 24 hours (equaling 24 * 60=1440 minute) measures, the sidewall of this routine reaction vessel is vertical mutually with container ground, be 5 minutes this routine detection time, and furniture or finishing have two evaporation surface with material.
When reaching the highest permission concentration of formaldehyde of national regulation, clear height (m) * careat (m in the formaldehyde total amount=room of room air
2) * the highest permission concentration of formaldehyde (0.08mg/m
3)=2.6 (m) * careat (m
2) * the highest permission concentration of formaldehyde (0.08mg/m
3)
Institute measures and monitor the growth of standing timber and expects that release formaldehyde amount in detection time=colour developing blocks concentration of formaldehyde * measured material area * reaction vessel clear height=colour developing card concentration of formaldehyde * measured material area * 0.005
Institute measure and monitor the growth of standing timber in the material 24 hours release formaldehyde amount=institute measure and monitor the growth of standing timber material release formaldehyde amount * 24 in detection time (hour) * 2 (material is two-sided)/5 (minute)=institute measure and monitor the growth of standing timber material release formaldehyde amount detection time * 24 * 60 in detection time (minute) * 2/5 (minute)=colour developing card concentration of formaldehyde * measured material area * 0.005 * 2 * 1440/5=colour developing blocks concentration of formaldehyde * measured material area * 2.88
Suppose the material release formaldehyde of only measuring and monitoring the growth of standing timber in the room, the formaldehyde of expecting release formaldehyde amount=room air in 24 hours of measuring and monitoring the growth of standing timber so allows total amount
2.6 (m) * careat (m
2) * the highest permission concentration of formaldehyde (0.08mg/m
3)=colour developing card concentration of formaldehyde * measured material area * 2.88
Measured material area/careat (m
2)=2.6 * the highest permission concentration of formaldehyde (0.08mg/m
3)/colour developing card concentration of formaldehyde * the highest permission the concentration of formaldehyde of 2.88 ≈ (0.08mg/m
3) * 0.9/ colour developing card concentration of formaldehyde
So just can mark on colorimetric card, when not using other formaldehyde releasable material, the organization owned housing usable floor area can use the maximum area of the material of measuring and monitoring the growth of standing timber.For example, a cover house usable floor area is 100 square metres, only uses institute to measure and monitor the growth of standing timber and expects finishing, if the concentration of formaldehyde 0.16mg/m of the corresponding colorimetric card of result of the material of measuring and monitoring the growth of standing timber
3, what measure and monitor the growth of standing timber material so is 0.45 with coefficient of discharge, this measures and monitor the growth of standing timber and expects that maximum consumption in this room is 100 square metres * 0.45=45 square metre.If the concentration of formaldehyde 0.08mg/m of the corresponding colorimetric card of the result who measures
3, what measure and monitor the growth of standing timber material so is 0.9 with coefficient of discharge, the maximum consumption of expecting of measuring and monitoring the growth of standing timber is 100 square metres * 0.9=90 square metre.
This example kit using method: if measure airborne concentration of formaldehyde, open this detection kit, holder is put into environment to be measured, developer is dripped in central authorities at holder, take out after 5 minutes, the contrast ratio colour atla just can draw the concentration of formaldehyde of environment to be measured.If want to measure furniture or fit up the formaldehyde volatile quantity of using material, developer is dripped in holder central authorities at reaction vessel, be buckled on the detected materials downwards with reaction vessel is uncovered immediately, see color contrast ratio colour atla after 5 minutes, can find the volatile quantity and the maximum use amount of this material general housing unit area of material.
Claims (10)
1, a kind of methanal fast-inspecting reagent unit and preparation method thereof, described kit mainly is made up of the holder that is loaded with highly basic, developer and colorimetric card, it is characterized in that: holder is loaded with highly basic, developer is 4-amino-3-hydrazine-5-sulfydryl-1,2, the acidic aqueous solution of 4-triazole (being called for short AHMT).
2, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof is characterized in that: described highly basic is NaOH, potassium hydroxide, lithium hydroxide, beryllium hydroxide, calcium hydroxide or magnesium hydroxide.
3, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof is characterized in that: holder is paper, cloth, sponge, cotton, nonwoven fabrics or other porosints.
4, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof is characterized in that: the acidity of developer is to be provided and kept by hydrochloric acid, sulfuric acid, phosphoric acid or other acidic materials.
5, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof is characterized in that: the acidity of developer is to be provided and kept by hydrochloric acid.
6, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof is characterized in that: 4-amino in the developer-3-hydrazine-5-sulfydryl-1,2, the concentration of 4-triazole is 20mM to 100mM.
7, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof is characterized in that: colorimetric card is that colorimetric card is marked with the formaldehyde volatile quantity with the color of actual measurement back kit or the photo colour code as colorimetric card.
8, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof, it is characterized in that: kit is furnished with the open-top receptacle that holds holder, and this open-top receptacle is provided with projection, tongue, groove or other stationary installations can be fixed on container bottom with holder.
9, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof, it is characterized in that: the holder that is loaded with highly basic is to soak into dry then filter paper through the NaOH of 2M to 5M or potassium hydroxide solution, 4-amino in the developer-3-hydrazine-5-sulfydryl-1,2, the concentration of 4-triazole is 20mM to 100mM, the acidity of developer is to be provided and kept by hydrochloric acid, and the pH of developer is 2 to 4.
10, a kind of methanal fast-inspecting reagent unit according to claim 1 and preparation method thereof is characterized in that: the colorimetric card subscript long-pending maximum use amount of material list plane of measuring and monitoring the growth of standing timber to some extent.
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|---|---|---|---|
| CN 200610057924 CN101029870A (en) | 2006-02-28 | 2006-02-28 | Methanal fast-inspecting reagent unit and its production |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645355A (en) * | 2012-05-22 | 2012-08-22 | 长春美泰科技有限公司 | Method for passively and quickly absorbing formaldehyde in air |
| CN103698324A (en) * | 2013-11-27 | 2014-04-02 | 厦门理工学院 | Air formaldehyde self testing kit |
| CN104316516A (en) * | 2014-09-28 | 2015-01-28 | 烟台大学 | Chromic material for detecting reductive gas |
| CN106153611A (en) * | 2015-04-24 | 2016-11-23 | 广东华润涂料有限公司 | For quickly detection polymer emulsion or comprise described polymer emulsion preparation in the method for formaldehyde |
| CN107340289A (en) * | 2017-06-28 | 2017-11-10 | 防城港市质量技术监督局 | A kind of formaldehyde determination kit |
| CN111537501A (en) * | 2020-03-31 | 2020-08-14 | 陕西省食品药品监督检验研究院 | Kit and method for rapidly detecting total amount of ethylene oxide and 2-chloroethanol in medical instrument |
-
2006
- 2006-02-28 CN CN 200610057924 patent/CN101029870A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645355A (en) * | 2012-05-22 | 2012-08-22 | 长春美泰科技有限公司 | Method for passively and quickly absorbing formaldehyde in air |
| CN103698324A (en) * | 2013-11-27 | 2014-04-02 | 厦门理工学院 | Air formaldehyde self testing kit |
| CN104316516A (en) * | 2014-09-28 | 2015-01-28 | 烟台大学 | Chromic material for detecting reductive gas |
| CN106153611A (en) * | 2015-04-24 | 2016-11-23 | 广东华润涂料有限公司 | For quickly detection polymer emulsion or comprise described polymer emulsion preparation in the method for formaldehyde |
| CN107340289A (en) * | 2017-06-28 | 2017-11-10 | 防城港市质量技术监督局 | A kind of formaldehyde determination kit |
| CN111537501A (en) * | 2020-03-31 | 2020-08-14 | 陕西省食品药品监督检验研究院 | Kit and method for rapidly detecting total amount of ethylene oxide and 2-chloroethanol in medical instrument |
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