CN112525898A - Test paper and method for detecting formaldehyde content in textile - Google Patents
Test paper and method for detecting formaldehyde content in textile Download PDFInfo
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- CN112525898A CN112525898A CN202011417547.3A CN202011417547A CN112525898A CN 112525898 A CN112525898 A CN 112525898A CN 202011417547 A CN202011417547 A CN 202011417547A CN 112525898 A CN112525898 A CN 112525898A
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 495
- 238000012360 testing method Methods 0.000 title claims abstract description 107
- 239000004753 textile Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000011161 development Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- MLIWQXBKMZNZNF-KUHOPJCQSA-N (2e)-2,6-bis[(4-azidophenyl)methylidene]-4-methylcyclohexan-1-one Chemical compound O=C1\C(=C\C=2C=CC(=CC=2)N=[N+]=[N-])CC(C)CC1=CC1=CC=C(N=[N+]=[N-])C=C1 MLIWQXBKMZNZNF-KUHOPJCQSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 abstract description 15
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000000638 solvent extraction Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 12
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 10
- 230000007246 mechanism Effects 0.000 description 9
- 239000013307 optical fiber Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 229920000297 Rayon Polymers 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000008098 formaldehyde solution Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- -1 aliphatic aldehydes Chemical class 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012031 short term test Methods 0.000 description 1
- 208000017520 skin disease Diseases 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009988 textile finishing Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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Classifications
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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
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a test paper for detecting formaldehyde content in textiles and a detection method, wherein the test paper comprises formaldehyde test paper and a color comparison card used for being compared with the formaldehyde test paper; the formaldehyde test paper comprises a test layer, a self-heating layer and a paper pasting layer, wherein the test layer is sequentially arranged into a second formaldehyde developing part, a second formaldehyde developing part and a handheld part in a partitioning manner; the self-heating layer is attached to the bottoms of the first formaldehyde developing part and the second formaldehyde developing part and used for heating the test layer; the adhesive paper layer is adhered to the self-heating layer and used for isolating the self-heating layer from air before use. Free formaldehyde in the fabrics is through extracting the back, carries out the quick test with formaldehyde test paper, whether reference color comparison card can judge its formaldehyde content fast accords with the regulation requirement of fabric, and easy operation is convenient, can satisfy the quick analysis and the judgement of a large amount of samples.
Description
Technical Field
The invention relates to a detection method, in particular to a detection test paper for detecting formaldehyde content in textiles and a detection method, and belongs to the field of chemical analysis.
Background
In order to improve the performances of crease resistance, color fixation and the like of the fabric, a certain amount of formaldehyde is added in the textile finishing process. Free formaldehyde in clothes can harm human bodies through respiratory tracts and skins. Low levels of formaldehyde can cause respiratory inflammation and skin disease, and high levels of formaldehyde can even induce tissue mutations and cancer. In order to safeguard the health and safety of consumers, developed countries, such as europe, the usa and japan, specify maximum residual limits for formaldehyde. The GB 18401-2010 national basic safety technical Specification for textile products in China specifies the maximum residual limit of formaldehyde for three types of textiles respectively.
At present, the test standard of formaldehyde in GB 18401-2010 is GB/T2912.1-2009 assay part 1 of textile formaldehyde: free and hydrolyzed formaldehyde (water extraction method), which adopts an acetylacetone spectrophotometry method for experiment, has complex operation, longer test time and speciality, and is not convenient for simple, rapid and non-professional test of formaldehyde in textiles.
Patent document 1 discloses a method for measuring the formaldehyde content of a fabric, which includes a step S1 of receiving formaldehyde emitted from the surface of the fabric in a closed container, and simultaneously absorbing and consuming the formaldehyde in the closed container by a formaldehyde response module; s2, converting the formaldehyde concentration information in the closed container into an electric signal by the formaldehyde response module; and S3, converting the electric signal into the formaldehyde content of the fabric according to the electric signal and a conversion database. The method and the system for measuring the formaldehyde content of the fabric do not adopt an optical method, have short test time and simple test method, do not need to use any consumables or reagents for measurement, and avoid the defects of time consumption, inconvenience and higher cost caused by the adoption of the optical method in the conventional method and the conventional system for measuring the formaldehyde content of the fabric.
Patent document 2 discloses a device for testing the formaldehyde content of a fabric, which comprises a base, a colorimetric tube, a sample box, a first driving mechanism, a second driving mechanism, an optical fiber probe, a lifting driving mechanism and a controller, wherein the colorimetric tube is used for containing formaldehyde extraction liquid of the fabric to be tested; the sample box is movably arranged on the base, and is provided with a plurality of placing holes for placing the colorimetric tubes; the first driving mechanism is arranged on the base and used for driving the sample box to move left and right back and forth; the second driving mechanism is arranged on the base and used for driving the sample box to move back and forth; the optical fiber probe is arranged on the base and is opposite to the sample box, and the absorbance of the formaldehyde extraction liquid can be detected; the lifting driving mechanism is arranged on the base, connected with the base and used for driving the optical fiber probe to move downwards so as to enter the colorimetric tube to detect the absorbance of the formaldehyde extraction liquid; the controller is connected with the first driving mechanism, the second driving mechanism, the lifting driving mechanism and the optical fiber probe respectively, and the testing device can finish testing of a plurality of fabrics to be tested at one time, so that the testing efficiency is improved.
The method described in patent document 1 relates to the content of formaldehyde emitted into the air by the fabric, and not to the content of free formaldehyde in the fabric extract liquid regulated by GB 18401-2010 national basic safety and technical Specification for textile products. The device according to patent document 2 corresponds to an improved spectrophotometer and is convenient for testing, but the device is expensive and not versatile, and is not suitable for use by non-professionals. The detection device according to patent document 3 is used for detecting the formaldehyde content in food, and is mainly used for qualitative analysis, but not for quantitative analysis.
Disclosure of Invention
The invention provides a test paper for detecting formaldehyde content in textiles and a detection method, aiming at solving the problem that the prior art is inconvenient for simple, rapid and non-professional testing of formaldehyde in textiles.
The purpose of the invention is realized by the following technical scheme, which is combined with the attached drawings:
as one aspect of the present invention, a test paper for detecting formaldehyde content in a textile is provided, which includes a formaldehyde test paper and a color comparison card for reference with the formaldehyde test paper; the formaldehyde test paper comprises a test layer, a self-heating layer 3 and a paper pasting layer 4, wherein the test layer is sequentially arranged into a second formaldehyde developing part 2, a first formaldehyde developing part 1 and a handheld part 5 in a partitioning manner; the self-heating layer 3 is attached to the bottoms of the first formaldehyde developing part 1 and the second formaldehyde developing part 2 and used for heating the test layer; the adhesive paper layer 4 is adhered to the self-heating layer 3 and used for isolating the self-heating layer 3 from air before use.
Further, a first formaldehyde color developing part 1 of the formaldehyde test paper adopts medium-speed quantitative filter paper and is soaked by mixed solution of AHMT and potassium hydroxide; the first formaldehyde color developing part 1 is used for the absorption reaction of formaldehyde.
Further, a second formaldehyde color developing part 2 of the formaldehyde test paper adopts medium-speed quantitative filter paper and is soaked by a mixed solution of potassium periodate and potassium hydroxide; the second formaldehyde color developing part 2 is used for the color developing reaction of formaldehyde;
further, after soaking, the formaldehyde test paper is placed into a 100 ℃ blast drying oven for drying, and is sealed and stored in a dark place after drying.
Further, formaldehyde test paper's self-heating layer 3 is including the bag that generates heat, and the bag intussuseption that generates heat is filled with self-heating material, and the bag laminating that generates heat is in first formaldehyde colour development portion 1 and the 2 bottoms of second formaldehyde colour development portion.
Furthermore, the adhesive paper layer 4 of the formaldehyde test paper is adhesive paper and is adhered to the bottom of the self-heating layer 3 to prevent the heating material from contacting air.
Further, the preparation method of the color comparison card comprises the following steps: and (3) carrying out color development reaction on the formaldehyde test paper when the formaldehyde standard is respectively 0.1mg/L, 0.2mg/L, 0.4mg/L, 0.6mg/L, 0.75mg/L, 1.5mg/L and 3mg/L, and preparing a colorimetric card according to the display color of the color development reaction.
As another aspect of the present invention, a method for detecting a test paper for detecting formaldehyde content in a textile is provided, which comprises the following steps: weighing 1g of textile sample, adding 100mL of distilled water, and heating and extracting; dropping a certain amount of extract liquid on a first formaldehyde developing part 1 of the formaldehyde test paper, and then laying the formaldehyde test paper horizontally; then tearing off the paper layer 4 at the bottom; after a period of time, standing the formaldehyde test paper, and waiting for the liquid to change color when the liquid completely flows from the first formaldehyde color developing part 1 to the second formaldehyde color developing part 2; and finally, judging the content range of formaldehyde in the textile and the compliance thereof by referring to the color of the color comparison card.
The invention has the following beneficial effects:
(1) the operation of testing the formaldehyde content in the textile by using the method is simple;
(2) the method has high sensitivity and small interference in testing the content of the formaldehyde;
(3) the content and the compliance can be directly judged by adopting a colorimetric card, and the test speed is high;
(4) after the formaldehyde test paper is prepared, the formaldehyde test paper is stored in a closed and dark state and can be stored for a long time;
(5) the invention has universality, and non-professionals can carry out experiments and judgment.
Drawings
FIG. 1 is a schematic view of a formaldehyde test paper structure of the test paper for detecting formaldehyde content in textiles according to the present invention;
FIG. 2 is a schematic diagram of a color chart pattern of the test paper for detecting formaldehyde content in a textile according to the present invention;
in the figure:
1-a first formaldehyde developing part;
2-second formaldehyde color developing part;
3-self-heating layer;
4-a paper-sticking layer;
5-hand-held part.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.
Firstly, a developing method capable of developing the color of the formaldehyde solution is selected, and the current commonly used detection methods for formaldehyde detection comprise an AHMT method, a phenol reagent method, an acetylacetone method and the like, wherein the acetylacetone method has good selectivity and simple operation, but has poor sensitivity, and acetylacetone needs to be freshly configured (decomposed by visible light) and cannot meet the development conditions of a test paper method; the phenol reagent method is simple to operate and low in cost, but is easily interfered by aliphatic aldehydes and has poor selectivity; the AHMT method is relatively complex, but the AHMT method is less in matrix interference, good in selectivity and high in sensitivity, so that the AHMT method is adopted to develop the test paper detection method.
However, the AHMT method requires a step-by-step reaction and then a test, and requires a proper reaction temperature and reaction time, so that the AHMT method is used as a basis for designing the test paper, so that the functions of simple operation, rapid detection, convenience and high efficiency are achieved.
As shown in fig. 1 and fig. 2, the test paper for detecting formaldehyde content in textile includes a formaldehyde test paper and a color chart for reference with the formaldehyde test paper. After the extracted fabric solution is detected by the detection test paper, whether the fabric meets the regulation and control requirements or not can be quickly judged.
As shown in fig. 1, the formaldehyde test paper comprises a test layer, a self-heating layer 3 and a paper-attached layer 4, wherein the test layer is sequentially divided into a first formaldehyde developing part 1, a second formaldehyde developing part 2 and a handheld part 5; the self-heating layer 3 is attached to the bottoms of the first formaldehyde developing part 1 and the second formaldehyde developing part 2 and used for heating the test layer; the adhesive paper layer 4 is adhered to the self-heating layer 3 and used for isolating the self-heating layer 3 from air before use.
Selecting medium-speed quantitative filter paper and infiltrating the medium-speed quantitative filter paper with a mixed solution of AHMT and potassium hydroxide by using a first formaldehyde developing part 1 of the formaldehyde test paper, wherein the first formaldehyde developing part 1 is used for formaldehyde absorption reaction;
selecting medium-speed quantitative filter paper and soaking the medium-speed quantitative filter paper in a mixed solution of potassium periodate and potassium hydroxide in a second formaldehyde developing part 2 of the formaldehyde test paper, wherein the second formaldehyde developing part 2 is used for developing reaction of formaldehyde;
the self-heating layer 3 of the formaldehyde test paper comprises a heating bag, self-heating materials are filled in the heating bag, and the heating bag is attached to the bottoms of the first formaldehyde developing part 1 and the second formaldehyde developing part 2;
the adhesive paper layer 4 of the formaldehyde test paper is adhesive paper and is adhered to the bottom of the self-heating layer 3 to prevent the heating material from contacting air.
The handheld part 5 of the formaldehyde test paper is a blank part and can be contacted by hands, so that an operator can use the test paper by holding the test paper by hands conveniently.
Drying the soaked formaldehyde test paper in a blast drying oven at 100 ℃, sealing and storing in dark.
When the formaldehyde standard of the formaldehyde test paper is respectively 0.1mg/L, 0.2mg/L, 0.4mg/L, 0.6mg/L, 0.75mg/L, 1.5mg/L and 3mg/L, carrying out color development reaction, and preparing the colorimetric card according to the display color of the color development reaction.
GB 18401-2010 national Standard on safety of textile products has detailed requirements on the content of formaldehyde, as shown in Table 1. The three control limit values of the color comparison card have corresponding comparison colors.
TABLE 1 Formaldehyde limit in textiles (GB 18401-
A test method of test paper for detecting formaldehyde content in textiles comprises the following steps:
weighing 1g of textile sample, adding 100mL of distilled water for heating and extracting, dripping a certain amount of extract liquid on a first formaldehyde color developing part 1 of formaldehyde test paper, at the moment, the formaldehyde test paper lies horizontally, and then tearing off a paper pasting layer 4 at the bottom; after a period of time, standing the formaldehyde test paper, and waiting for most of the liquid to flow from the first formaldehyde developing part 1 to the second formaldehyde developing part 2. Finally, the color of the color comparison card can be referenced to judge the content range and the compliance of the formaldehyde in the textile.
In the following description of specific examples, specific details are set forth in order to provide a more thorough understanding of the present invention.
Example 1 validation of validity
Accurately transferring 1.0mL of 0.50mg/L standard formaldehyde solution, dripping the standard formaldehyde solution at the central position of the first formaldehyde color developing part 1, horizontally placing the test paper at the moment, tearing off the adhesive paper of the heating bag, vertically placing the test paper after 10min, carrying out colorimetric judgment after most of liquid flows into the position of the second formaldehyde color developing part 2, and horizontally placing for 2min, wherein the color developing range is between 0.40mg/L and 0.60mg/L, and the test result is effective and accurate.
Example 2 Formaldehyde detection example
Weighing 1g of textile sample, adding 100mL of distilled water, extracting for 60min in a 40 ℃ water bath kettle in a shaking manner, accurately taking 1.0mL of extract liquid to drop at the central position of the first formaldehyde developing part 1, keeping the test paper flat at the moment, tearing off the paper pasting layer 4 of the self-heating layer 3, standing the test paper upright after 10min, and carrying out colorimetric judgment after most of liquid flows into the second formaldehyde developing part 2 and is kept flat for 2 min. The traditional acetylacetone test method has the reaction and color development process of 60min, and the test and judgment can be finished only in 12 min.
Claims (8)
1. The test paper for detecting the formaldehyde content in the textile is characterized by comprising formaldehyde test paper and a color comparison card used for being compared with the formaldehyde test paper; the formaldehyde test paper comprises a test layer, a self-heating layer (3) and a paper pasting layer (4), wherein the test layer is sequentially divided into a second formaldehyde developing part (2), a first formaldehyde developing part (1) and a handheld part (5); the self-heating layer (3) is attached to the bottoms of the first formaldehyde developing part (1) and the second formaldehyde developing part (2) and used for heating the test layer; the adhesive paper layer (4) is adhered to the self-heating layer (3) and used for isolating the self-heating layer (3) from air before use.
2. The test paper for detecting the formaldehyde content in the textile according to claim 1, wherein the first formaldehyde color developing part (1) of the test paper for detecting formaldehyde adopts medium-speed quantitative filter paper and is soaked by mixed solution of AHMT and potassium hydroxide; the first formaldehyde color developing part (1) is used for absorption reaction of formaldehyde.
3. The test paper for detecting the formaldehyde content in the textile according to claim 2, wherein the second formaldehyde color developing part (2) of the test paper for formaldehyde adopts medium-speed quantitative filter paper and is soaked by a mixed solution of potassium periodate and potassium hydroxide; the second formaldehyde color development part (2) is used for the color development reaction of formaldehyde.
4. The test paper for detecting the formaldehyde content in the textile according to claim 3, wherein the test paper for formaldehyde is placed in a 100 ℃ blast drying oven for drying after being soaked, and is sealed and protected from light after being dried.
5. The test paper for detecting the formaldehyde content in the textile according to claim 1, wherein the self-heating layer (3) of the test paper for formaldehyde comprises a heating bag, a self-heating material is filled in the heating bag, and the heating bag is attached to the bottoms of the first formaldehyde developing part (1) and the second formaldehyde developing part (2).
6. The test paper for detecting the formaldehyde content in the textile according to claim 1, wherein the paper pasting layer (4) of the test paper for formaldehyde is adhesive pasting paper which is pasted at the bottom of the self-heating layer (3) and prevents the heating material from contacting air.
7. The test paper for detecting the formaldehyde content in the textile according to claim 1, wherein the preparation method of the color chart comprises the following steps: and (3) carrying out color development reaction on the formaldehyde test paper when the formaldehyde standard is respectively 0.1mg/L, 0.2mg/L, 0.4mg/L, 0.6mg/L, 0.75mg/L, 1.5mg/L and 3mg/L, and preparing a colorimetric card according to the display color of the color development reaction.
8. The method for detecting the formaldehyde content in the textile according to claim 1, comprising the following steps: weighing 1g of textile sample, adding 100mL of distilled water, and heating and extracting; dropping a certain amount of extract liquid on a first formaldehyde developing part (1) of the formaldehyde test paper, and then laying the formaldehyde test paper horizontally; then tearing off the bottom paper layer (4); after a period of time, standing the formaldehyde test paper, and waiting for the liquid to change color when the liquid completely flows from the first formaldehyde color developing part (1) to the second formaldehyde color developing part (2); and finally, judging the content range of formaldehyde in the textile and the compliance thereof by referring to the color of the color comparison card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011417547.3A CN112525898A (en) | 2020-12-05 | 2020-12-05 | Test paper and method for detecting formaldehyde content in textile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011417547.3A CN112525898A (en) | 2020-12-05 | 2020-12-05 | Test paper and method for detecting formaldehyde content in textile |
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| CN205719999U (en) * | 2016-06-21 | 2016-11-23 | 上海瑞鑫科技仪器有限公司 | Formaldehyde in food Test paper |
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2020
- 2020-12-05 CN CN202011417547.3A patent/CN112525898A/en active Pending
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