JP4995791B2 - Formaldehyde detection sheet - Google Patents

Description

  The present invention relates to formaldehyde detection paper for detecting formaldehyde present in air.

  Formaldehyde is contained in newly built houses and furniture, for example, and is a causative substance for indoor environmental pollution. It is also considered as one of the causes of sick house syndrome for people with chemical sensitivity.

  For this reason, a technique for measuring the concentration of formaldehyde more easily and with high accuracy is required, and various detection materials have been proposed. For example, in Patent Document 1, hydroxylamine hydrochloride and a hydrogen ion concentration indicator having a color change region in an acidic region are developed on a porous carrier (paper) to form formaldehyde detection paper. According to this detection paper, it is possible to detect several ppm of formaldehyde remaining in the air after disinfection using formaldehyde in a high humidity region where the relative humidity is 80% or more.

  In Patent Document 2, one selected from methyl yellow, methyl orange, benzyl orange, and tropeoline as hydroxylamine sulfate and a hydrogen ion concentration indicator is developed on a porous carrier to form a formaldehyde detection paper. According to this detection paper, it is possible to detect 0.3 to 4 ppm of formaldehyde in a 30% relative humidity environment.

  There is also a measurement method for detecting 0.04-10 ppm formaldehyde using a filter wetted with an alkaline aqueous solution of 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (see Patent Document 3). ). According to this method, 0.04-10 ppm formaldehyde can be detected.

  There is also a formaldehyde detection material in which 4-amino-4-phenyl-3-en-2-one and a buffer solution are developed on a base material containing silica gel (see Non-Patent Document 1). According to this detection material, 0.05 to 0.7 ppm of formaldehyde can be detected.

  In addition, a test paper “formaldehyde test strip” (manufactured by Kanto Kagaku Co., Ltd.) that sells a substance having an enaminone group on a cellulose substrate and detects formaldehyde by a change in color is sold (see Non-Patent Document 2).

Japanese Patent Application Laid-Open No. 07-055792 Japanese Patent Application Laid-Open No. 07-229889 JP 2003-247899 A Y. Suzuki, et al. "Portable Sick House Syndrome Gas Monitoring System Based on Novel Colorimetric Reagents for the Highly Selective and Sensitive Detection of Formaldehyde", Environ. Sci. Technol., Vol. 37, 5695-5700, 2003. http://www.kanto.co.kp/siyaku/hcho/

  However, the conventional measurement technique described above has a problem that formaldehyde contained in air (atmosphere) cannot be measured with high accuracy and simply as described below. First, the detection paper of Patent Document 1 has a disadvantage that the measurement conditions are largely regulated because the use environment is limited to high humidity. In addition, the detection paper of Patent Document 2 has a disadvantage that it is impossible to measure the environmental standard value of 0.08 ppm. Moreover, the method of Patent Document 3 includes a step of wetting the filter with a solution immediately before the measurement, and thus has a disadvantage that the measurement is not so easy.

  Further, in the detection material of Non-Patent Document 1, since the base material is opaque, it is necessary to measure reflected light in order to measure the color change of the detection material, and there is a disadvantage that the accuracy is not sufficient. In addition, in order to improve accuracy (sensitivity), electric power is required to increase the amount of air to be passed per unit time using a pump or the like, and thus there is a disadvantage that measurement is not easy. Further, since the technique of Non-Patent Document 2 uses an equilibrium reaction, the color once faded will shift to a state where the formaldehyde concentration is low. For this reason, the technique of Non-Patent Document 2 has a problem that measurement is not easy, for example, it is necessary to always observe a test paper.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to make it possible to measure formaldehyde contained in air with high accuracy and ease.

Formaldehyde sensor sheet according to the present invention, a sheet-like carrier made of fibers, comprising at least a supported detecting agent to the carrier, the detection agent is a 1-phenyl-1,3 porcine down dione, An ammonium salt selected from among ammonium acetate, ammonium salicylate, and ammonium succinate, and a selected acid in acetic acid and citric acid.

  In the formaldehyde detection sheet, the sheet-like carrier is preferably composed of fibers mainly composed of cellulose. Further, the detection agent is supported on the carrier by impregnating the carrier with a solution in which the detection agent is dissolved.

As described above, according to the present invention, a sheet-like carrier made of fibers, selection and 1-phenyl-1,3 porcine down dione, ammonium acetate, from among ammonium salicylate and ammonium succinate, Since a detection sheet containing a selected ammonium salt and a selected acid in acetic acid and citric acid is loaded into a detection sheet, formaldehyde contained in the air can be measured with high accuracy and simplicity. An excellent effect is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1]
First, the formaldehyde detection sheet in Embodiment 1 of this invention is demonstrated with the preparation methods of a detection sheet. First, a method for producing a formaldehyde detection sheet will be described. As shown in FIG. 1A, 35 ml of ethanol and water are added to 7.5 g of ammonium acetate, 0.15 ml of acetic acid and 0.156 g of 1-phenyl-1,3-butanedione. Thus, the detection agent solution 101 having a total amount of 50 g is prepared in the container 102.

  Next, as shown in FIG. 1B, the sheet-like carrier 103 is immersed in the detection agent solution 101, and is immersed for 30 seconds, for example, to impregnate the sheet-like carrier 103 with the detection agent solution 101. The sheet-like carrier 103 is a sheet composed of fibers such as cellulose, and is, for example, cellulose filter paper (No. 2) manufactured by Advantech (Toyo Filter Paper Co., Ltd.). The sheet-like carrier 103 may be white, for example.

  Next, after the sheet-like carrier 103 is impregnated with the detection agent solution 101, the sheet-like carrier 103 impregnated with the detection agent (detection agent solution) is air-dried and, as shown in FIG. 1C, in a nitrogen gas stream for 24 hours. It is left to dry and a detection sheet (formaldehyde detection sheet) 103a is produced. Therefore, a detection agent containing 1-phenyl-1,3-butanedione, ammonium acetate, and acetic acid is introduced into the detection sheet 103a, and the detection agent is placed in a plurality of holes formed by fine meshes in the detection sheet 103a. Is carried.

  In addition, the above-mentioned support | carrier shows the state which each component substance contained in a detection agent has couple | bonded or adsorb | sucked with the support | carrier (base material) chemically, physically, or electrically. A sheet composed of fibers such as cellulose has a hydrophilic surface, and water, an aqueous solution, and a water-soluble substance are easily adsorbed. Therefore, the detection agent solution that is an aqueous solution and the component substance having water solubility adhere (adsorb) to the surface of the fibers constituting the sheet. As described above, a state in which the component material of the detection agent is coated and / or impregnated on the sheet made of the fibers is supported.

  According to the detection sheet 103a configured as described above, when formaldehyde touches the detection sheet 103a, ammonium ions generated from ammonium acetate supported on the detection sheet 103 and 1-phenyl-1,3-butanedione are generated. A reaction product having a light absorption characteristic in the visible light region is generated. As a result, as described below, it is considered that the reflectance of the detection sheet 103a changes after measuring formaldehyde.

Next, a method for detecting formaldehyde using the detection sheet 103a will be described. First, the reflectance (surface reflectance) of the detection sheet 103a is measured. For example, as shown in FIG. 1D, the intensity I of the reflected light obtained by reflecting the incident light having the light intensity I ₀ is measured, and the reflectance (= I ₀ / I) is obtained therefrom.

  Next, as shown in FIG. 1E, the detection sheet 103a is exposed to the air 104 to be measured in which formaldehyde is present. Thereafter, the detection sheet 103b after measurement (exposure) is taken out from the air 104 to be measured, and the reflectance of the detection sheet 103b after measurement is measured again as shown in FIG. 1F.

  FIG. 2 shows the measurement results of the two reflectances described above. In FIG. 2, the measurement result of the reflectance before exposure (exposed) to the air to be measured is indicated by a solid line, and the measurement result of the reflectance after exposure is indicated by a dotted line. As shown by the solid line in FIG. 2, the detection sheet 103b after measurement that comes into contact with formaldehyde has a reflection characteristic in which absorption is observed from the ultraviolet region to a wavelength of about 500 nm. Accordingly, measurement of formaldehyde can be measured and quantified by measuring the change in light reflection in the formaldehyde detection sheet in the present embodiment. For example, the change in light reflection can be detected by measuring the reflectance of light from a purple light emitting diode (center wavelength: 420 nm).

  Next, the results of measurement of air containing formaldehyde in the concentration range of 15 ppb to 120 ppb using the formaldehyde detection sheet (detection sheet 103a) in the present embodiment will be described. The detection sheet 103a is placed and exposed in the air to be measured for 5 hours, and the reflectance before and after the exposure is measured. According to the result of this measurement, the relationship between the amount of change in the logarithm of the reflectance before exposure and the reflectance after exposure and the concentration of formaldehyde contained in the air to be measured is as shown in FIG. , Almost proportional. Thus, according to the formaldehyde detection sheet in the present embodiment, it is understood that formaldehyde having a concentration of 15 to 120 ppb can be detected with high sensitivity by using the reflectance measurement as described above.

  Next, a description will be given of the result of measuring the reflectance by using the detection sheet 103a and changing the exposure time in air containing 90 ppb formaldehyde. As shown in FIG. 4, the longer the exposure time, the greater the difference in reflectance before and after the measurement, and it can be seen that the detection sheet 103a measures the formaldehyde concentration cumulatively. Therefore, according to the detection sheet 103a, even if it is a low concentration formaldehyde, it is possible to detect (measure) by exposing for a longer time.

  By the way, the filter paper used for the detection sheet 103a is thin enough to transmit light, so that the spectrum of transmitted light can be measured. FIG. 5 shows the transmission spectrum of the detection sheet 103a before and after being exposed to air containing formaldehyde. In FIG. 5, the solid line is the transmission spectrum before exposure, and the dotted line is the transmission spectrum after exposure. As shown in FIG. 5, the transmission spectrum of the detection sheet 103a changes by touching formaldehyde. Therefore, according to the detection sheet 103a, it is possible to measure formaldehyde also by measuring a transmission spectrum.

[Embodiment 2]
Next, a second embodiment of the present invention will be described. The formaldehyde detection sheet in this Embodiment 2 is comprised from what contains 1-phenyl- 1, 3- butanedione, ammonium acetate, and a citric acid as a detection agent. Although the acetic acid is used in the formaldehyde detection sheet in the first embodiment described above, the second embodiment is different in that citric acid is used instead of acetic acid.

  For example, to 7.5 g of ammonium acetate, 0.55 g of citric acid monohydrate and 0.156 g of 1-phenyl-1,3-butanedione, 35 ml of ethanol and water are added to prepare a detection agent solution with a total amount of 50 g. . Next, the sheet-like carrier is immersed in the produced detection agent solution, and for example, immersed for 30 seconds to impregnate the sheet-like carrier with the detection agent solution. The sheet-like carrier is the same as in the first embodiment described above, and is a sheet made of fibers such as cellulose, for example, cellulose filter paper (No. 2) manufactured by Advantech (Toyo Roshi Kaisha, Ltd.).

  Next, after impregnating the sheet-like carrier with the detection agent solution, the sheet-like carrier impregnated with the detection agent (detection agent solution) is air-dried and left to stand in a nitrogen gas stream for 24 hours to dry. To do. In the thus-prepared formaldehyde detection sheet, a detection agent containing 1-phenyl-1,3-butanedione, ammonium acetate, and citric acid is introduced, and the formaldehyde detection sheet has a plurality of pores formed by fine meshes. In addition, the detection agent is carried.

  In the formaldehyde detection sheet in Embodiment 2, when the reflectance before and after exposure to air containing formaldehyde is measured, as shown in FIG. 6, after exposure (dotted line), before exposure (dotted line) Compared to the solid line), it has a reflection characteristic in which absorption is observed at a wavelength of about 500 nm from the ultraviolet region. Therefore, also in the formaldehyde detection sheet in the present embodiment, measurement of formaldehyde and measurement can be performed by measuring the change in light reflection. For example, the change in light reflection can be detected by measuring the transmittance of light from a purple light emitting diode (center wavelength: 420 nm).

  Further, when the formaldehyde detection sheet in the present embodiment is exposed to air containing 90 ppb formaldehyde for 5 hours and the reflectance before and after the exposure is measured, a value of 0.029 is obtained as the amount of change in the reflectance logarithm. From this result, according to the formaldehyde detection sheet in the present embodiment, it can be seen that formaldehyde at the concentration of the environmental guide value can be detected. Note that the amount of change in the logarithm of the reflectance described above is 20% compared to the formaldehyde detection sheet in Embodiment 1 using acetic acid.

[Embodiment 3]
Next, a third embodiment of the present invention will be described. The formaldehyde detection sheet in this Embodiment 3 is comprised from what contains 1-phenyl- 1, 3- butanedione, ammonium salicylate, and a citric acid as a detection agent. The formaldehyde detection sheet according to the second embodiment described above uses ammonium acetate, but the third embodiment is different in that ammonium salicylate is used instead of ammonium acetate.

  For example, a detection agent solution in which 35 g of ethanol and water are added to 8.0 g of ammonium salicylate, 0.55 g of citric acid monohydrate, and 0.156 g of 1-phenyl-1,3-butanedione to make a total amount of 50 g is prepared. . Next, the sheet-like carrier is immersed in the produced detection agent solution, and for example, immersed for 30 seconds to impregnate the sheet-like carrier with the detection agent solution. The sheet-like carrier is the same as in the first embodiment described above, and is a sheet made of fibers such as cellulose, for example, cellulose filter paper (No. 2) manufactured by Advantech (Toyo Roshi Kaisha, Ltd.).

  Next, after impregnating the sheet-like carrier with the detection agent solution, the sheet-like carrier impregnated with the detection agent (detection agent solution) is air-dried and left to stand in a nitrogen gas stream for 24 hours to dry. To do. In the thus-prepared formaldehyde detection sheet, a detection agent containing 1-phenyl-1,3-butanedione, ammonium salicylate, and citric acid is introduced, and the formaldehyde detection sheet has a plurality of pores formed by fine meshes. In addition, the detection agent is carried.

  In the formaldehyde detection sheet according to the third embodiment, when the reflectance before and after the exposure to the air containing formaldehyde is measured, the exposure after the exposure (dotted line) is the same as in the second embodiment. Compared to before (solid line), a reflection characteristic in which absorption is observed from the ultraviolet region to a wavelength of about 500 nm is provided. Therefore, also in the formaldehyde detection sheet in the present embodiment, measurement of formaldehyde and measurement can be performed by measuring the change in light reflection. For example, the change in light reflection can be detected by measuring the transmittance of light from a purple light emitting diode (center wavelength: 420 nm).

  Further, when the formaldehyde detection sheet 90 ppb in the present embodiment is exposed to air containing formaldehyde for 5 hours and the reflectance before and after the exposure is measured, a value of 0.23 is obtained as the change in reflectance logarithm. From this result, according to the formaldehyde detection sheet in the present embodiment, it can be seen that formaldehyde at the concentration of the environmental guide value can be detected. The amount of change in the logarithm of the reflectance described above is 140% compared to the formaldehyde detection sheet in Embodiment 1 using acetic acid.

[Embodiment 4]
Next, a fourth embodiment of the present invention will be described. The formaldehyde detection sheet in this Embodiment 4 is comprised from what contains 1-phenyl- 1, 3- butanedione, ammonium succinate, and a citric acid as a detection agent. In the formaldehyde detection sheet in the second embodiment described above, ammonium acetate is used, but in the fourth embodiment, ammonium succinate is used instead of ammonium acetate.

  For example, a detection agent solution with a total amount of 65 g by adding 35 ml of ethanol and water to 8.0 g of ammonium succinate, 0.55 g of citric acid monohydrate and 0.156 g of 1-phenyl-1,3-butanedione is prepared. To do. Next, the sheet-like carrier is immersed in the produced detection agent solution, and for example, immersed for 30 seconds to impregnate the sheet-like carrier with the detection agent solution. The sheet-like carrier is the same as in the first embodiment described above, and is a sheet made of fibers such as cellulose, for example, cellulose filter paper (No. 2) manufactured by Advantech (Toyo Roshi Kaisha, Ltd.).

  Next, after impregnating the sheet-like carrier with the detection agent solution, the sheet-like carrier impregnated with the detection agent (detection agent solution) is air-dried and left to stand in a nitrogen gas stream for 24 hours to dry. To do. In the formaldehyde detection sheet thus prepared, a detection agent containing 1-phenyl-1,3-butanedione, ammonium succinate, and citric acid is introduced, and a plurality of pores due to fine meshes of the formaldehyde detection sheet are introduced. The detection agent is carried inside.

  In the formaldehyde detection sheet in the present embodiment 4, when the reflectance before and after exposure to air containing formaldehyde is measured, the exposure after exposure (dotted line) is the same as in the second embodiment. Compared to before (solid line), a reflection characteristic in which absorption is observed from the ultraviolet region to a wavelength of about 500 nm is provided. Therefore, also in the formaldehyde detection sheet in the present embodiment, measurement of formaldehyde and measurement can be performed by measuring the change in light reflection. For example, the change in light reflection can be detected by measuring the transmittance of light from a purple light emitting diode (center wavelength: 420 nm).

  Further, when the reflectance of the formaldehyde detection sheet 90 ppb in this embodiment is exposed to air containing formaldehyde for 5 hours and the reflectance before and after the exposure is measured, a value of 0.056 is obtained as the amount of change in reflectance logarithm. From this result, according to the formaldehyde detection sheet in the present embodiment, it can be seen that formaldehyde at the concentration of the environmental guide value can be detected. The amount of change in the reflectance logarithm described above is 35% as compared to the formaldehyde detection sheet in Embodiment 1 using acetic acid.

  Next, a comparative example for the formaldehyde detection sheet in each embodiment described above will be described.

[Comparative Example 1]
First, Comparative Example 1 will be described. A sample solution is prepared by adding water to a sample component of 7.5 g of ammonium acetate, 0.15 ml of acetic acid and 0.1 ml of acetylacetone to make the total amount 50 g. Next, the sheet-like carrier is immersed in the prepared sample solution, and for example, immersed for 30 seconds to impregnate the sheet-like carrier with the sample solution. The sheet-like carrier is the same as in each of the embodiments described above, and is cellulose filter paper (No. 2) manufactured by Advantech (Toyo Filter Paper Co., Ltd.).

  Next, after impregnating the sheet-like carrier with the sample solution, the sheet-like carrier impregnated with the sample component (sample solution) is air-dried and left to stand in a nitrogen gas stream for 24 hours to obtain a sample sheet. A sample sheet containing acetylacetone, ammonium acetate, and acetic acid is introduced into the sample sheet thus prepared, and the sample component is supported in a plurality of holes formed by fine meshes in the sample sheet. It becomes. In Comparative Example 1, acetylacetone is used instead of 1-phenyl-1,3-butanedione in the first embodiment. These are all β-diketones.

  When this sample sheet is exposed to air containing formaldehyde, it exhibits a reflection characteristic having absorption at 420 nm. However, the amount of change in the logarithm of the reflectance before and after the exposure is 0.04 in the sample sheet immediately after the production, but no change is seen in the sample sheet one month after the production. In the above-described change in reflectance test, the formaldehyde concentration is exposed to 120 ppb air for 5 hours. The value of 0.04 described above immediately after the production is 25% in the case of the formaldehyde detection sheet of Embodiment 1 using 1-phenyl-1,3-butanedione.

  As described above, in the sample sheet of Comparative Example 1, formaldehyde cannot be detected after one month. This is presumably because the acetylacetone carried on the sample sheet by the production gradually vaporizes. Thus, when acetylacetone is used instead of 1-phenyl-1,3-butanedione, a formaldehyde detection sheet capable of stable measurement cannot be obtained.

[Comparative Example 2]
Next, Comparative Example 2 will be described. A sample solution having a total amount of 50 g is prepared by adding 5 ml of water and ethanol to sample components of 7.5 g of ammonium acetate, 0.15 ml of acetic acid, and 0.108 g of 3-diphenyl-1,3-propanedione. Next, the sheet-like carrier is immersed in the prepared sample solution, and for example, immersed for 30 seconds to impregnate the sheet-like carrier with the sample solution. The sheet-like carrier is the same as in each of the embodiments described above, and is cellulose filter paper (No. 2) manufactured by Advantech (Toyo Filter Paper Co., Ltd.).

  Next, after impregnating the sheet-like carrier with the sample solution, the sheet-like carrier impregnated with the sample component (sample solution) is air-dried and left to stand in a nitrogen gas stream for 24 hours to obtain a sample sheet. In the sample sheet thus prepared, sample components containing 3-diphenyl-1,3-propanedione, ammonium acetate, and acetic acid are introduced, and the plurality of holes formed by fine meshes in the sample sheet The sample component is supported. In Comparative Example 2, 3-diphenyl-1,3-propanedione is used instead of 1-phenyl-1,3-butanedione in the first embodiment. These are all β-diketones.

  When this sample sheet is exposed to air containing 120 ppb formaldehyde (5 hours), no change in the reflection spectrum occurs. Thus, when 3-diphenyl-1,3-propanedione is used instead of 1-phenyl-1,3-butanedione, a detection sheet capable of detecting formaldehyde cannot be obtained.

[Comparative Example 3]
Next, Comparative Example 3 will be described. A sample solution in which 35 g of ethanol and water are added to 7.5 g of triammonium citrate, 0.55 g of citric acid monohydrate and 0.156 g of 1-phenyl-1,3-butanedione to make a total amount of 50 g is prepared. Next, the sheet-like carrier is immersed in the prepared sample solution, and for example, immersed for 3 minutes to impregnate the sheet-like carrier with the sample solution. The sheet-like carrier is the same as in each of the embodiments described above, and is cellulose filter paper (No. 2) manufactured by Advantech (Toyo Filter Paper Co., Ltd.).

  Next, after impregnating the sheet-like carrier with the sample solution, the sheet-like carrier impregnated with the sample component (sample solution) is air-dried and left to stand in a nitrogen gas stream for 24 hours to obtain a sample sheet. A sample component containing 1-phenyl-1,3-butanedione, triammonium citrate, and citric acid is introduced into the sample sheet thus prepared, and a plurality of pores are formed by the fine mesh of the sample sheet. In addition, the sample components are supported. In Comparative Example 3, triammonium citrate is used instead of ammonium acetate in the second embodiment.

  When this sample sheet is exposed to air containing 120 ppb formaldehyde (5 hours), a yellow color is seen in a mottled state. In such a state, the result of the measured reflection spectrum differs depending on the location where the reflection spectrum is measured, and accurate measurement is impossible. In Comparative Example 3, since triammonium citrate is used, each component cannot be uniformly dispersed in a sheet-like carrier composed of fibers mainly composed of cellulose, such as the filter paper. it is conceivable that.

  In the above description, filter paper is used. However, the present invention is not limited to this. Any sheet-like material composed of cellulose fibers, such as ordinary paper, can be used as a sheet-like carrier. Further, not only cellulose but also a sheet-like material (nonwoven fabric or the like) composed of other fibers such as nylon or polyester can be used as a sheet-like carrier. In particular, the surface of the fiber is preferably hydrophilic with a polar group. The sheet carrier is preferably white, but is not limited thereto. As long as the change in the reflected light can be detected and confirmed, it may be in another color state.

As described above, in the invention, the cellulose is composed of fibers composed mainly of a sheet-like carrier such as filter paper, to the sheet-like carrier, and 1-phenyl-1,3 porcine down dione, A formaldehyde detection sheet is characterized in that an ammonium salt selected from among ammonium acetate, ammonium salicylate, and ammonium succinate and a selected acid in acetic acid and citric acid are supported. According to this formaldehyde detection sheet, a trace amount of formaldehyde contained in the air can be easily measured with high sensitivity without using a special substrate. In addition, according to the formaldehyde detection sheet of the present invention, formaldehyde can be measured cumulatively, so that, for example, a trace amount of formaldehyde below ppb can be detected by increasing the measurement time.

It is explanatory drawing for demonstrating the preparation methods of the formaldehyde detection sheet | seat in embodiment of this invention. It is explanatory drawing for demonstrating the preparation methods of the formaldehyde detection sheet | seat in embodiment of this invention. It is explanatory drawing for demonstrating the preparation methods of the formaldehyde detection sheet | seat in embodiment of this invention. It is explanatory drawing for demonstrating the measuring method using the formaldehyde detection sheet | seat in embodiment of this invention. It is explanatory drawing for demonstrating the measuring method using the formaldehyde detection sheet | seat in embodiment of this invention. It is explanatory drawing for demonstrating the measuring method using the formaldehyde detection sheet | seat in embodiment of this invention. It is a characteristic view which shows the measurement result of the reflectance twice before and after making formaldehyde into the measuring object in the measurement using the formaldehyde detection sheet | seat in Embodiment 1. FIG. It is a characteristic view which shows the result of having measured the air containing formaldehyde in the density | concentration range of 15ppb to 120ppb using the formaldehyde detection sheet | seat in Embodiment 1. FIG. It is a characteristic view which shows the result of having measured the reflectance by changing the exposure time in the air containing 90 ppb formaldehyde using the formaldehyde detection sheet in Embodiment 1. FIG. It is a characteristic view which shows the result of having measured the transmission spectrum of the formaldehyde detection sheet | seat in Embodiment 1 before and behind exposing to the air containing formaldehyde. It is a characteristic view which shows the measurement result of the reflectance twice before and after making formaldehyde into the measuring object in the measurement using the formaldehyde detection sheet | seat in Embodiment 2. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Detection agent solution, 102 ... Container, 103 ... Sheet-like carrier, 103a ... Detection sheet (formaldehyde detection sheet), 103b ... Detection sheet after measurement, 104 ... Air to be measured.

Claims (3)

A sheet-like carrier composed of fibers;
And at least a detection agent supported on the carrier,
The detection agent is 1-phenyl-1,3 porcine down dione, ammonium acetate, and selected salts from among ammonium salicylate and ammonium succinate, and acid selected among acetic acid and citric acid Formaldehyde detection sheet characterized by containing. In the formaldehyde detection sheet according to claim 1,
The formaldehyde detection sheet, wherein the sheet-like carrier is composed of fibers mainly composed of cellulose. In the formaldehyde detection sheet according to claim 1 or 2,
The formaldehyde detection sheet, wherein the detection agent is supported on the carrier by impregnating the carrier with a solution in which the detection agent is dissolved.

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