JP2005345280A - Indicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indicator capable of certainly determining a specific gas in a sample gas even if gas which shows reaction similar to that of the specific gas is contained in the sample gas and capable of measuring and determining the concentration of the specific gas in the sample gas over a long time. <P>SOLUTION: The indicator is composed of a detection member 2 capable of detecting the specific gas, a removing material 3, a spacer 4 provided with venting holes 4a, a main body 5 capable of housing them and a lid member 6, which is formed of a transparent member, capable of sealing the opening part 5a of the main body. The detection member and the removing material are arranged in the main body through the spacer 4 and the venting holes 5e of the main body are provided near the removing material. The amount of the specific gas is detected by adsorbing the sample gas vented from the venting holes of the main body by the detection member through the removing material and the spacer and the detected amount of the specific gas can be confirmed from a window part 66. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an indicator that can measure and determine an air environment over a long time, for example, in a room of an art museum or a museum or in a storage.

  In general, an active sampling method, a passive sampling method, or the like is used to determine an air environment such as a room in an art museum or a museum or a storage room.

  As an active sampling method, for example, a sample gas is introduced into a sampler using a pump or the like, the sample gas is collected for a predetermined time of about several minutes to 30 minutes, and the concentration is determined by analyzing the sample gas. Is.

  In this active sampling method, it is an evaluation in a short time of several minutes to about 30 minutes, and it is not possible to evaluate the sampling over a long time, and when determining the air environment such as the storage May be different from the actual concentration because it is necessary to open a door or the like during measurement.

  As a passive sampling method, for example, there is a discoloration test paper method. This discoloration test paper method is a method for judging the air environment used in art museums or museums, etc., and a reagent is prepared by mixing a pH indicator, and the reagent is immersed in a discoloration test paper such as filter paper to remove excess reagent. The filter paper is allowed to stand for about 24 hours after being removed, and the color of the filter paper is evaluated by comparing with the reference color chart.

  This standard color chart is yellow in acidic, yellow-green in neutral, and blue in basic, and is divided into steps 1 to 8 from acidic to neutral and basic. In this discoloration test paper method, when it reacts with an acidic substance, the color changes to the yellow side, and when it reacts with a basic substance, the color changes to the blue side. Therefore, the degree of discoloration changes depending on the strength and amount of the acidity of the substance. Therefore, the air environment can be determined by measuring the change. In this discoloration test paper method, since the reagent is immersed in the filter paper, the sampling time is about 24 hours at the maximum.

  In this discoloration test paper method, since it can be determined simply by placing the filter paper at the measurement position, measurement is possible even when determining the air environment such as in the storage as in the active sampling method. It is not necessary to open the door etc. at the time of sampling, but the sampling time is about 24 hours at the maximum, it cannot be measured and judged over a longer time, and the discolored test paper is wet Because it is used, for example, it is difficult to use it in the vicinity of substances that affect the quality of cultural assets, etc. Furthermore, if acidic substances and basic substances coexist in the measurement environment, it works in the direction of neutralization. As a result, appropriate evaluation may not be possible.

  Therefore, as a passive sampling method that can be used in a wet state, for example, a gas indicator body is formed in a substantially plate shape and a passage for introducing a specific gas to be detected is formed therein, and the inner wall of the passage is formed. In the gas indicator, the indicator layer that changes color by reacting with a specific gas along the passage is pasted, and the indicator body is provided with a window for viewing the color change of the indicator layer in the passage. There is a high-sensitivity gas indicator in which an opening having a predetermined area that can be contacted is formed and an indicator layer is provided in the opening (see Patent Document 1).

  The known technique of Patent Document 1 aims to detect a low-concentration gas in a short time so that the presence / absence of a low-concentration specific gas and the CT value of the specific gas can be clearly understood. The indicator layer is composed of an indigo dye and silica gel holding moisture, and has an indicator layer that is immediately exposed to ozone gas and an indicator layer that is sequentially exposed by the diffusion of ozone gas, They are exposed to direct contact with these indicator layers.

JP-A-8-122318

  However, in the known technique disclosed in Patent Document 1, a low concentration gas is detected in a short time, and is not measured and determined over a long period of time. In the sample gas to be determined, Since the gas other than the specific gas contained in the gas also contacts the indicator layer, if the sample gas contains a gas that shows a similar reaction to the specific gas, the specific gas to be measured When other gases come into contact with the indicator layer, interference (disturbance) occurs, and there is a problem that reliable determination cannot be performed.

  Therefore, the conventional indicator for detecting a specific gas is a passive sampling method that can be used in a dry state, in which the sample gas contains a gas that exhibits a reaction similar to that of the specific gas. However, there is a problem that must be solved by making it possible to make a reliable determination and to measure and determine the concentration of a specific gas in the sample gas over a long period of time.

  As a specific means for solving the problems of the conventional example described above, the indicator according to the present invention includes a detection member capable of detecting a specific gas, a removal material, a spacer provided with a spacer vent, and the detection member and the removal material. And a main body capable of accommodating the spacer, and an opening formed in the main body, and a lid member in which at least the window located in the opening is formed of a transparent member, and the spacer is disposed in the main body. The detection member and the removal material are disposed through the main body ventilation hole in the vicinity of the removal material, and the sample gas vented from the main body ventilation hole is adsorbed by the detection member through the removal material and the spacer. Thus, the main feature is that the amount of the specific gas is detected and the detected amount of the specific gas can be confirmed from the window.

  In the present invention, the detection member comprises a detection agent obtained by adhering and drying a reagent on a carrier formed in a substantially spherical or polyhedral shape, and a support for supporting the detection agent; the carrier includes silica gel, alumina Any one or more of diatomaceous earth and quartz sand; the reagent is a coloring solution obtained by dissolving a coloring reagent in a solvent; the support is a resin, fiber or nonwoven fabric; and the lid member Are formed with a flange portion protruding from the opening of the main body and a hanging portion in which the peripheral edge of the flange portion is suspended below the bottom portion of the main body, and the lid member is passed through the flange portion and / or the hanging portion. Including pores as an additional requirement.

  An indicator according to the present invention is formed on a detection member capable of detecting a specific gas, a removal material, a spacer provided with a spacer vent, a main body capable of storing the detection member, the removal material, and the spacer, and the main body. A cover member that can seal the opened opening and at least the window located in the opening is formed of a transparent member, and a detection member and a removal material are disposed in the main body via a spacer, A main body ventilation hole is provided in the vicinity of the removal material, and the amount of a specific gas is detected by the sample gas vented from the main body ventilation hole being adsorbed to the detection member via the removal material and the spacer. This is a passive sampling method that can be used in a dry state because the amount of the specified gas can be confirmed from the window, and the sample gas contains a gas that exhibits a similar reaction to the specified gas. Even if it is, the interference of the gas can be prevented by the removal material, and it can be reliably determined, and the concentration of a specific gas in the sample gas can be measured and determined over a long time. Has an effect.

Next, the present invention will be described in detail based on specific embodiments.
The indicator which concerns on embodiment of this invention is demonstrated using FIGS. 1-4. FIG. 1 is a schematic plan view of the indicator 1, FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is an exploded view of components of the indicator 1. A schematic cross-sectional view is shown.

  The indicator 1 seals a detection member 2, a removal material 3, a spacer 4, a main body 5 that can store the detection member 2, the removal material 3, and the spacer 4, and an opening 5 a formed in the main body 5. It is comprised from the lid member 6 which can be formed.

  As shown in the enlarged cross-sectional view of FIG. 4, the detection member 2 has a reagent 8 attached to a carrier 7 formed in, for example, a substantially spherical or polyhedral shape by means of impregnation, spraying or coating. The detection agent 9 is dried by heat drying or reduced pressure drying later, and a support 10 that is provided around the detection agent 9 so as to sandwich the detection agent 9 and supports and supports the detection agent 9. . In FIG. 4, the detection agent 9 is provided on both surfaces of the support 10 disposed in the center, and the detection agent 9 is supported on the upper and lower surfaces of the detection agent 9 to support the detection agent 9. However, the present invention is not limited to this. For example, the support 10 is provided so as to sandwich the detection agent 9 and is formed in a single layer supporting the detection agent 9 or one of the supports 10. The detection agent 9 may simply be supported on the surface.

  The detection agent 9 includes a carrier 7 as a base material and a reagent 8 attached to the carrier 7. As the carrier 7, for example, one kind or two or more kinds of carriers such as silica gel, alumina, diatomaceous earth, or silica sand can be used. As the reagent 8, for example, potassium carbonate, phosphoric acid or hydroxylamine phosphate For example, ammonia, acetic acid, formic acid, formaldehyde or the like is detected by changing the reagent 8 by using a coloring solution in which a coloring reagent (pH indicator) such as glycerin is dissolved in a solvent (wetting agent) such as glycerin. Will be able to.

  Moreover, as the said support body 10, it is formed in substantially plate shape or disk shape, for example using resin, a fiber, or a nonwoven fabric. As a method for supporting the detection agent 9 on the support 10, for example, heating is performed in a state where a resin having a melting point lower than that of the support 10 is provided between the support 10 and the detection agent 9, and the resin is used. For example, a method in which the detection agent 9 is supported and adhered to the support 10 by being cooled again after being melted can be used.

  In this way, the detection member 2 supports the support 10 with the detection agent 9 that has been dried by attaching the reagent 8 to the carrier 7, and thus can be used in a dry state. The gas can be detected.

  In addition, the removing material 3 is a color reagent (pH indicator) capable of adsorbing a gas that exhibits a similar reaction to the specific gas to be determined as the type of the color reagent (pH indicator) of the reagent 8 used in the detection member 2. The other configuration is the same as that of the detection member 2, and a gas showing a similar reaction other than the specific gas adsorbed by the detection member 2 contained in the sample gas is used. By actively adsorbing to the removing material 3, interference with a gas other than the specific gas adsorbed by the detection member 2 is prevented.

  The spacer 4 is formed in a substantially plate shape or a disk shape using a material having chemical resistance such as a glass material or a resin material such as polyethylene, polypropylene, or polystyrene. In addition, one or more spacer vent holes 4a are formed in the periphery thereof.

  The main body 5 includes, for example, a bottom portion 5b formed in a substantially plate shape or a disk shape, and an upright portion 5c. For example, the main body 5 has a chemical resistance and gas barrier such as a glass material or a resin material such as polyethylene, polypropylene, or polystyrene. It is formed using what has property.

  Inside the main body 5, the detection member 2, the removal material 3, and the spacer 4 can be accommodated. When the detection member 2, the removal material 3, and the spacer 4 are accommodated in the main body 5 through the opening 5a, for example, the removal material 3 is disposed on the bottom 5b inside the main body 5, The spacer 4 is disposed on the detection member 2 and the detection member 2 is disposed thereon, that is, the removing material 3 and the detection member 2 are disposed via the spacer 4.

  By disposing the removal material 3 and the detection member 2 through the spacer 4 in this way, the removal material 3 and the detection member 2 can be physically separated from each other, and gas permeability and diffusibility are provided. Can be improved. At this time, a step portion 5d may be provided at a height at which the spacer 4 in the main body 5 is disposed, so that the spacer 4 can be disposed in a stable state.

  In the vicinity of the removal material 3 of the main body 5, for example, when the removal material 3 is disposed on the bottom portion 5 b in the main body 5 in the above example, it is preliminarily disposed in the substantially central portion of the bottom portion 5 b or around it. One or more main body vents 5e are drilled and provided. By perforating the main body vent hole 5e in this manner, even when the opening 5a of the main body 5 is sealed by the lid member 6, the surrounding air, that is, the sample gas, passes from the main body vent hole 5e. 5 is ventilated.

  The lid member 6 is formed using a material having chemical resistance and gas barrier properties such as a glass material or a resin material such as polyethylene, polypropylene, or polystyrene, and is fitted into the opening 5a of the main body 5. For example, as shown in the drawing, the fitting portion 6a of the lid member 6 is formed in a convex shape in accordance with the inner diameter shape of the opening 5a, and the fitting portion 6a is fitted into the opening 5a. Thus, the opening 5 a of the main body 5 can be sealed with the lid member 6.

  And the part located in the opening part 5a of the cover member 6 at least, for example, the fitting part 6a has the chemical resistance and gas barrier property, and the window part 6b is made of a transparent member. It forms so that the detection member 2 arrange | positioned in this main body 5, ie, this main body 5, can be visually confirmed from this window part 6b. In the window portion 6b, for example, the entire lid member 6 is formed by using a member having the chemical resistance and gas barrier property and having transparency, and the entire lid member 6 is formed of a transparent window portion. It also includes the use as.

  Further, the lid member 6 may simply be formed so as to seal the opening 5a and allow the detection member 2 in the main body 5 to be visually observed. For example, as shown in FIG. A flange portion 6c formed by extending the peripheral portion of 6a so as to protrude from the opening portion 5a of the main body 5, and a droop formed by dropping the peripheral portion of the flange portion 6c below the bottom portion 5b of the main body 5 A portion 6d may be provided. When the flange portion 6c and the hanging portion 6d are formed on the lid member 6, a lid member ventilation hole 6e is provided in the flange portion 6c and / or the hanging portion 6d so as to pass through the lid member. The sample gas may be vented into the main body 5 from the main body vent hole 5e through the pore 6e.

  When the indicator 1 is formed by combining these members, for example, in the example shown in the figure, as described above, the removal material 3 is disposed from the opening 5a to the bottom 5b in the main body 5, and on the top, The detection member 2 is disposed via the spacer 4, and the fitting portion 6 a of the lid member 6 is fitted to the opening portion 5 a to seal the opening portion 5 a of the main body 5. At this time, the sealing material 11 is disposed between the fitting portion of the main body 5 and the lid member 6, that is, between the opening portion 5a and the fitting portion 6a, and the opening portion 5a and the fitting portion 6a are arranged. You may make it improve adhesiveness and airtightness. As the sealing material 11, for example, a sealing material such as an O-ring formed using a material having chemical resistance and elasticity such as silicon can be used.

  Further, for example, a sheet material 12 or the like is pasted on the portion of the main body 5 of the indicator 1 before use which is provided with the main body vent 5e, that is, the bottom 5b of the main body 5, and the sheet material 12 is used. It is preferable to prevent air from being ventilated in the previous main body 5 and peel off the sheet material 12 during use so that the sample gas can be ventilated in the main body 5 for determination.

  In the indicator 1 thus formed, the sample gas is vented and introduced into the main body 5 from the main body vent hole 5e through the lid member vent hole 6e, and the sample gas vented and introduced into the main body 5 is Then, the detection member 2 is brought into contact with the removal member 3 and the spacer 4.

  When the sample gas passes through the removing material 3, the sample gas contains a gas that is adsorbed by the removing material 3. That is, the sample gas is similar to the sample gas other than the specific gas that is adsorbed by the detection member 2. Is contained in the removal material 3, the sample gas that has passed through the removal material 3 passes through the spacer vent holes 4 of the spacer 4. When contacting the detection member 2, gas that exhibits a similar reaction other than the specific gas is not included, and therefore interference by a gas that exhibits a similar reaction other than the specific gas in the detection member 2. Since no interference occurs, the detection member 2 reliably detects and adsorbs only a specific gas, and the color of the detection agent 9 (reagent 8) of the detection member 2 changes. Judgment with less error can be made reliably, and The detection member 2 because it does not contact directly with the sample gas, a long time the concentration of a specific gas in the sample gas (e.g., about 4 days) will be able to determine and measure over.

  Furthermore, since the member constituting the indicator 1 is dry and not in a wet state, it can be used in the vicinity of a substance that affects the quality of a cultural property or the like, for example. Because it reacts only with a specific gas, even in the measurement environment, that is, when an acidic substance and a basic substance coexist in the sample gas, the amount of the specific gas can be reliably detected and judged. It becomes.

  The amount of the specific gas detected by the detection member 2 in this way can be easily confirmed from the outside of the indicator 1, that is, can be easily visually confirmed from the transparent window 6b of the lid member 6. For example, even when the indicator 1 is placed in a transparent case or a storage room in which a cultural property or the like is stored, the identification detected by the indicator 1 from the outside of the case without opening the case This makes it possible to easily check and determine the amount of gas.

  Next, the reagent 8 used for the detection agent 9 of the detection member 2 of the indicator 1 according to the present invention and the reagent 8 used for the removal material 3 will be described. Since the configuration other than the reagent 8 is as described in the above embodiment, the description thereof is omitted. In Example 1, when used as the indicator 1 for an organic acid, a change in the color change range of the color-developing reagent (pH indicator) due to the acid-base neutralization reaction is used. In this case, it is thought that basic substances such as ammonia interfere (disturb) from the acid-base neutralization reaction, so that the basic substance reacts with the acidic substance before reacting with the detection agent. Try to remove it.

  In short, as the reagent 8 used for the detection agent 9, for example, a coloring solution obtained by dissolving an alkaline coloring reagent (pH indicator) such as potassium carbonate in a solvent (wetting agent) such as glycerin is used. For example, an acidic substance such as phosphoric acid is dissolved in a solvent such as glycerin, and if necessary, pure water or alcohol such as methanol is mixed.

  In this Example 2, when used as the indicator 1 for ammonia, the change in the color change region of the color reagent due to the acid-base neutralization reaction is utilized. Since the acidic substance is considered to interfere (disturb), the acidic substance is removed by reacting with the basic substance before reacting with the detection agent.

  In short, the reagent 8 used for the detecting agent 9 is, for example, a coloring solution obtained by dissolving a coloring agent of an acidic substance such as phosphoric acid in a solvent such as glycerin, and the reagent 8 used for the removing agent 3 is, for example, hydroxylated. An alkaline substance such as potassium or potassium carbonate is dissolved in a solvent such as glycerin, and if necessary, pure water or alcohol such as methanol is mixed.

  In Example 3, when used as an indicator 1 for formaldehyde, since reaction using hydroxylamine phosphate that reacts with an aldehyde group is considered, it has the property of reacting with a substance having an aldehyde group and releasing phosphoric acid. Using hydroxylamine phosphate, and utilizing the change in the color change range of the coloring reagent due to the liberated phosphoric acid, the interfering substance in this case is a basic substance such as ammonia that generates neutralization reaction with the liberated phosphoric acid It is thought that acidic substances similar to liberated phosphoric acid interfere with (interfering), so before reacting with hydroxylamine phosphate, basic substances such as ammonia are acidic substances, acidic substances are basic substances and Remove by reacting each.

  In short, the reagent 8 used for the detecting agent 9 is, for example, a coloring solution obtained by dissolving a hydroxylamine phosphate coloring reagent in a solvent such as glycerin, and the reagent 8 used for the removing agent 3 is, for example, a base such as ammonia. When removing acidic substances, use acidic substances such as phosphoric acid, and when removing acidic substances, use alkalis such as potassium hydroxide or potassium carbonate, or a mixture of these, and use them in solvents such as glycerin. Dissolve and if necessary, mix with pure water or alcohol such as methanol.

It is the top view which showed schematically the indicator which concerns on embodiment of this invention. FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1. It is sectional drawing which decomposed | disassembled and showed schematically the structural member of the indicator. It is sectional drawing which expanded and showed schematically the detection member used for the indicator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indicator 2 Detection member 3 Removal material 4 Spacer 4a Spacer ventilation hole 5 Main body 5a Opening part 5b Bottom part 5c Upright part 5d Step part 5e Main body ventilation hole 6 Lid member 6a Fitting part 6b Window part 6c Flange part 6d Drooping part 6e Lid member Vent 7 Carrier 8 Reagent 9 Detection agent 10 Support 11 Sealing material 12 Sheet material

Claims (6)

Seals a detection member capable of detecting a specific gas, a removal material, a spacer provided with a spacer vent, a main body capable of storing the detection member, the removal material, and the spacer, and an opening formed in the main body. And at least a lid member formed of a transparent member with a window located at the opening,
A detection member and a removal material are disposed in the main body via a spacer,
A main body vent is provided in the vicinity of the removal material,
The sample gas vented from the main body vent is adsorbed to the detection member via the removing material and the spacer to detect the amount of the specific gas,
An indicator, characterized in that the amount of the detected specific gas can be confirmed from the window. The detection member is
The indicator according to claim 1, comprising a detection agent obtained by adhering and drying a reagent on a carrier formed in a substantially spherical or polyhedral shape, and a support that supports the detection agent. The indicator according to claim 2, wherein the carrier is one or more of silica gel, alumina, diatomaceous earth, and silica sand. The reagent is
The indicator according to claim 2, wherein the indicator is a color developing solution obtained by dissolving a color developing reagent in a solvent. The support is
It is resin, a fiber, or a nonwoven fabric, The indicator of Claim 2 characterized by the above-mentioned. In the lid member,
Forming a flange portion projecting from the opening of the main body, and a hanging portion in which the peripheral edge portion of the flange portion is suspended below the bottom portion of the main body;
The indicator according to claim 1, wherein a lid member ventilation hole is provided in the flange portion and / or the hanging portion.

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