JP2006047136A - Device for detecting chemical substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting chemical substance, capable of easily and inexpensively specifying the generation source of a volatile organic compound diffused inside a structure or inside a room. <P>SOLUTION: This chemical substance detecting device 100 for detecting gas of a volatile chemical substance that diffused from an inspection object is equipped with a detection sheet 2, reacting chemically with the volatile chemical substance and changing the color, and an installation means (a spacer 1, a pressing plate 3) for installing the detection sheet 2 at a prescribed aperture from the inspection object. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chemical substance detection apparatus for specifying a generation source of volatile chemical substances generated from a building and fixtures, furniture, interior materials and the like used therein.

In recent years, adverse effects on the human body of volatile chemical substances (hereinafter referred to as chemical substances) generated in buildings and their interiors have been regarded as a problem. That is, it is considered that chemical substances such as formaldehyde contained in building materials, interior materials, adhesives, paints, furniture, and fixtures are diffused into the air, and the human body causes allergic reactions.
In order to avoid this problem, it is necessary not to use a member containing these chemical substances when constructing a building or installing furniture and fixtures. However, for existing buildings and furniture, it is necessary to identify the chemical-containing member and take appropriate measures.

  Conventionally, a measuring means such as a glass detector or a chromatograph is used to detect a chemical substance (concentration) diffused in a building or indoor air. In this case, the detection result is detected as an average concentration in the building or the entire indoor space. This is because the concentration is made uniform according to the fluid equilibrium diffusion law.

In order to specify the chemical-containing member using the measuring means, it is necessary to directly inspect the wall, ceiling, furniture surface, etc. In this case, it takes time and cost, and efficiency It was not right.
That is, conventionally, it has been difficult to specify the source of the main chemical substance specifically and easily, and it has not been possible to efficiently take measures against chemical-containing members.

  The present invention has been made under the circumstances as described above, and provides a chemical substance detection apparatus that can easily and inexpensively specify a source of a volatile organic compound that diffuses in a building or indoors. For the purpose.

The chemical substance detection apparatus according to the present invention, which has been made to solve the above problems, is a chemical substance detection apparatus that detects a gas of a volatile chemical substance released from a test object, and chemically reacts with the volatile chemical substance. And a detection sheet that changes color, and an installation unit that installs the detection sheet from the inspection target via a predetermined gap. The gap is preferably any value between 3 and 5 mm.
By providing the installation means as described above, the detection sheet can be easily installed through the gap with respect to the detection target, and the color of the detection sheet changes, so that the detection result can be easily determined visually. be able to.
In general, the chemical substance diffused from other places is attached to the surface to be inspected, but the detection sheet does not come into direct contact with the surface to be inspected. Only chemical substances released from the test object can be detected purely.

The installation means includes a spacer having a thickness substantially equal to the dimension of the gap, and a pressing plate that presses and fixes the detection sheet placed on the spacer from above, and the spacer and the pressing plate It is preferable that an opening is formed and the detection sheet is provided so as to close a predetermined region of the opening.
If the installation means is configured in this way, a predetermined gap can be formed from the inspection object to the detection sheet depending on the thickness of the spacer. Also, with such a configuration, the detection sheet can be easily replaced. Furthermore, since the structure is simple, the installation means can be formed at low cost.

In addition, it is preferable that a planar dimension of the detection sheet is smaller than a planar dimension of the opening, and the opening is not completely closed by the detection sheet and a gap having a predetermined width is formed. The gap is desirably any value between 3 and 5 mm.
In this way, if the opening is not completely blocked, the gas of the chemical substance diffused under the detection sheet will not accumulate. It is possible to detect the concentration of chemicals that are emitted.

In addition, the detection sheet is formed of a paper or a non-woven fabric containing a reaction solution and a reagent that chemically react with the volatile chemical substance in a dry state, and changes color by chemically reacting with the volatile chemical substance. It is preferable.
If it does in this way, the color of a detection sheet can be changed according to the chemical substance to be diffused. Further, the detection sheet can be formed at a low cost.
The spacer is preferably made of paper or a polymer material.

  ADVANTAGE OF THE INVENTION According to this invention, the chemical substance detection apparatus which can identify the generation source of the volatile organic compound diffused in a building or a room easily and cheaply can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the entire chemical substance detection apparatus according to the present invention, and FIG. 2 is an exploded view showing the configuration of the chemical substance detection apparatus of FIG. The chemical substance detection apparatus 100 in FIG. 1 is for detecting a chemical substance that is diffused into the air from a wall, furniture, or the like in a building or a room, for example, and specifying the source of the chemical substance.

  As shown in FIG. 2, the chemical substance detection device 100 includes a plate-like spacer 1 attached to an inspection target such as a wall or furniture surface, a detection sheet 2 placed on the spacer 1, and a detection sheet 2. And a presser plate 3 that presses and fixes the base plate with the spacer 1. That is, the spacer 1 and the pressing plate 3 constitute an installation means for the detection sheet 2.

  The spacer 1 is formed of a sheet of paper having a predetermined thickness dimension (for example, 3 mm), a polymer material, or the like, and a rectangular opening 1a is formed at a substantially central portion as shown in the drawing. . Protrusions 1b and 1c are formed before and after the opening 1a.

  In addition, the detection sheet 2 is a paper (filter paper or the like) that has been impregnated with or sprayed with a reaction solution, a reagent, or the like so that the color of the detection sheet 2 changes in response to a chemical substance released from the inspection target, or It is formed of a nonwoven fabric or the like. The reaction solution and reagent are preferably prepared by, for example, adding a methyl orange reagent to a hydroxylamine chloride solution and adjusting the pH value to about 6.8 while adjusting the pH with an aqueous caustic soda solution.

  Further, the detection sheet 2 is formed in a rectangular shape like the opening 1a, but at least one dimension of the planar dimensions is shorter than one side (planar dimension) of the opening 1a. . That is, the detection sheet 2 is placed so as to close the opening 1a, but a gap 5 having a predetermined width (for example, 3 mm) is always formed as shown in FIG. 1 without completely closing the opening 1a. It is made so that.

The pressing plate 3 has an opening 3a formed in the same size and shape as the opening 1a of the spacer 1, and through holes 3b and 3c are formed in front and rear thereof. When the presser plate 3 is stacked on the upper portion of the spacer 1, the protrusions 1 b and 1 c formed on the spacer 1 are firmly fitted into the through holes 3 b and 3 c of the presser plate 3, respectively. The detection sheet 2 is pressed and fixed. At that time, the position of the opening 3a and the position of the opening 1a of the spacer 1 are configured to coincide with each other.
In addition, since the detection sheet 2 cannot be reused once the color changes due to a chemical reaction, it is necessary to replace the detection sheet 2 with a new unused sheet for each use at one inspection location. The spacer 1 and the pressing plate 3 are separated by pulling up 3 by hand, and the replacement work can be easily performed.

If the inspection object is in a place open to the space, the gas concentration around it moves in the direction to be averaged according to the average diffusion law. That is, if the detection sheet 2 is installed at a position away from the inspection object (for example, via a distance of 10 cm), the chemical substance detected by the detection sheet 2 has a concentration averaged over the entire room. It becomes. Therefore, in that case, it is not possible to clearly determine a comparison between the generation amount of the chemical substance released from the inspection target and the generation amount from other places.
In general, chemical substances diffused from other places are attached to the surface to be inspected, but when the detection sheet 2 is placed in direct contact with the surface to be inspected, even the attached chemical substances are detected. There is a fear. That is, in that case, it is not possible to purely detect only the chemical substances that are diffused from the inspection target, and errors are likely to occur in the detection results.

For this reason, the chemical substance detection apparatus 100 configured as described above is attached with the lower surface side of the spacer 1 in contact with the surface to be inspected. The attachment method is performed by sticking with a double-sided tape 4 having an adhesive force that can be easily attached or detached, a suction cup (not shown), or the like.
That is, the detection sheet 2 is installed with respect to the inspection object via a distance (for example, a gap of 3 mm) substantially the same as the thickness dimension of the spacer 1. Therefore, the chemical substance diffused from the inspection object can be detected by the detection sheet 2 installed as described above before the gas concentration is averaged, and the chemical substance attached to the inspection object surface ( That is, it is possible to accurately detect only the chemical substance released from the inspection object without detecting a chemical substance having a source at another location.

As described above, when the detection sheet 2 is placed on the spacer 1, the gap 5 having a predetermined width is provided. The gap 5 seals the space between the detection sheet 2 and the surface to be inspected. Therefore, the radiation from the surface to be inspected is made closer to natural radiation.
That is, when the space between the detection sheet 2 and the surface to be inspected is sealed, the diffused gas accumulates and the detected concentration becomes abnormally high, but the diffused gas does not accumulate by providing the gap 5, The concentration in a more natural state can be detected.
On the contrary, if the width dimension of the gap 5 is too large, the diffused chemical substance diffuses, so that the width is set to an appropriate width (for example, 3 mm).

As described above, according to the embodiment of the present invention, since it has a simple structure and is easy to install, it is possible to detect a chemical substance released from a test object without requiring specialized skills. .
Further, when inspecting a plurality of locations, only the detection sheet 2 needs to be replaced, so that the cost is low and the replacement work is easy, so that the inspection can be performed efficiently.
Furthermore, since the detection sheet 2 is installed from the surface to be inspected through an appropriate gap, and the appropriate gap 5 is provided in the openings 1a and 3a of the spacer 1 and the holding plate 3, it naturally diffuses from the object to be inspected. The detected chemical substance can be accurately detected.

In the above-described embodiment, the structure in which the spacer 1 and the pressing plate 3 are separated as shown in FIGS. 1 and 2 is shown. However, the present invention is not limited to this structure, and the spacer as shown in FIGS. And the pressing plate may be integrally formed.
In this case, for example, in the chemical substance detection apparatus 101 whose completed state is shown in FIG. 3, as shown in FIG. 2, the spacer 6 and the pressing plate 7 are integrally formed at the respective end portions 6b and 7b. The pressing plate 7 is rotatable with respect to the spacer 6 about the end portions 6 b and 7 b.

Further, in the spacer 6, a hook-like protrusion 6 c is formed at the end opposite to the end 6 b, and when the spacer 6 and the pressing plate 7 are overlapped with the detection sheet 2 interposed therebetween, it is shown in FIG. 3. Thus, the end 7c of the pressing plate 7 is configured to be engaged with the hook-shaped protrusion 6c.
When the detection sheet 2 is replaced, the state shown in FIG. 4 can be obtained again by pulling the hook-like projection 6c outward by hand and lifting the end 7c of the holding plate 7 upward. In this state, the replacement work is performed.

The shapes of the openings 6a and 7a of the spacer 6 and the holding plate 7 shown in FIGS. 3 and 4 are the same as the openings 1a and 3a of the spacer 1 and the holding plate 3 shown in FIGS. As in the case shown in FIG. 1, the gap 5 is formed when the detection sheet 2 is installed.
Therefore, the configuration shown in FIGS. 3 and 4 can provide the same effect as the configuration shown in FIGS.

  Next, the chemical substance detection apparatus according to the present invention will be further described based on examples.

[Example 1]
In order to examine the effect of the spacer included in the chemical substance detection apparatus according to the present invention, the adhesion of the chemical substance to be diffused to other locations was examined by experiments.
In this experiment, for example, the adhesion rate of formaldehyde, which is a typical chemical substance, was measured. The experimental conditions were that an atmosphere of room temperature of 30 ° C. and relative humidity of 60% was formed in a glass container having a volume of 5 L, and 10 mg of formalin with a concentration of 30% was dropped therein and left for 1 hour.

  Thereafter, when the concentration at which formalin vaporized was measured, it was about 120 ppm. Here, the concentration when the adhesion rate is 0% is 10 mg × 0.3 / 30 = 0.1 mmol when calculated as the molecular weight 30 of formaldehyde. Since the ambient temperature is 30 ° C., when temperature correction is performed, 0.1 mmol × (273 + 30) × 22.4 / 273 = 2.48 mL, and the concentration in the glass container is theoretically 2.48 mL × 1000. / 5 = 496 ppm.

  Therefore, this theoretical value is greatly different from the actual measurement value, and it can be considered that 376 ppm (= 496-120) adheres to the inner wall of the glass container. Further, the adhesion rate at this time was 376/496 = 0.756 (75.6%), which was a very large adhesion rate.

  From the above experimental results, it is proved that when the detection sheet of the chemical substance detection apparatus according to the present invention is in direct contact with the inspection object, an error is generated in the large detection result, and the predetermined detection from the inspection object by the spacer The effectiveness of the configuration according to the present invention in which the detection sheet is installed through the gap was confirmed.

[Example 2]
Next, in the chemical substance detection apparatus according to the present invention, the thickness dimension of the spacer (the gap dimension between the detection sheet and the inspection object) and the width dimension of the gap formed by the detection sheet and the opening of the spacer are examined. Went.
In this experiment, in a room where ventilation is not performed, as shown in the side view of FIG. 5, a spacer 11 whose height (thickness) C can be changed on a plywood 10 containing a chemical substance (formaldehyde). The detection sheet 2 and the pressing plate 12 were placed in order. Then, as the height (thickness) dimension C of the spacer 11 was changed, the width dimension C of the gap formed by the openings 11a and 12a and the detection sheet 2 was changed by the same value.

The value of the dimension C was 1, 2, 3, 4, 5 mm, and the formaldehyde concentration after 5 hours in each case was measured with the detection sheet 2. The results are shown in the table of FIG.
As shown in the results of FIG. 6, when the value of dimension C is 1 mm or 2 mm, gas is accumulated below the detection sheet 2 and the concentration is detected to be high, but when the value of dimension C is 3 to 5 mm, the concentration is constant. It became. From this result, when the thickness dimension of the spacer and the dimension of the opening and the gap formed by the detection sheet are the same, it was confirmed that a stable detection result could be obtained if about 3 mm could be secured.

[Example 3]
Next, the detection sheet of the chemical substance detection apparatus according to the present invention was examined. In this experiment, in producing a detection sheet, a methyl orange reagent was added to a hydroxylamine chloride solution, and the pH value was adjusted to about 6.8 while adjusting the pH with an aqueous caustic soda solution. Dried.

  It is known that when hydroxylamine chloride reacts with formaldehyde, hydrochloric acid is separated and decomposed into formaldoxime and water. The same applies to hydroxylamine phosphate. Methyl orange develops an orange color between pH 4.4 and 6.6.

  For this reason, when formaldehyde is allowed to react with the detection sheet, the separated hydrochloric acid lowers the overall pH value in the acidic direction, and when the pH value becomes 6.6 or less, orange should be developed and the color of the detection sheet should change. is there.

In this experiment, the detection sheet was actually put in a formaldehyde atmosphere, and the change was observed. As a result, the color changed to orange in 30 minutes after the addition in the 0.2 ppm atmosphere, 1.5 hours in the 0.1 ppm atmosphere, and 4 hours in the 0.05 ppm atmosphere.
As a result of this experiment, it was confirmed that the prototype detection sheet was practical even in actual use from the time when the detection sheet changed.

  From the results of the above examples, it was confirmed that according to the chemical substance detection apparatus of the present invention, it is possible to easily and inexpensively specify the source of the volatile organic compound that diffuses into the building or the room.

  The chemical substance detection apparatus according to the present invention is suitable for an application for identifying a source of chemical substances such as formaldehyde diffused in a building or indoors.

FIG. 1 is a perspective view showing the entire chemical substance detection apparatus according to the present invention. FIG. 2 is an exploded view showing the configuration of the chemical substance detection apparatus of FIG. FIG. 1 is a perspective view showing the whole of another embodiment of the chemical substance detection apparatus according to the present invention. FIG. 4 is an exploded view showing the configuration of the chemical substance detection apparatus of FIG. FIG. 5 is a side view of the chemical substance detection apparatus according to the present invention in the embodiment. FIG. 6 is a table showing experimental results using the chemical substance detection apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spacer 1a Opening part 1b Protruding part 1c Protruding part 2 Detection sheet 3 Holding plate 3a Opening part 3b Through hole 3c Through hole 4 Double-sided tape 5 Crevice 6 Spacer 6a Opening part 6b End part 6c Gutter-like protrusion 7 Holding plate 7a Opening part 100 Chemical substance detection device 101 Chemical substance detection device

Claims (7)

In the chemical substance detection device that detects the gas of volatile chemical substances released from the inspection target,
A detection sheet that chemically reacts with the volatile chemical substance to change the color;
A chemical substance detection apparatus comprising: an installation unit configured to install the detection sheet from the inspection target via a predetermined gap.   2. The chemical substance detection apparatus according to claim 1, wherein the gap has a value between 3 and 5 mm. The installation means includes a spacer having a thickness substantially equal to the dimension of the gap, and a pressing plate that presses and fixes the detection sheet placed on the spacer from above.
3. The chemical substance detection apparatus according to claim 1, wherein the spacer and the pressing plate are formed with an opening, and the detection sheet is provided so as to close a predetermined region of the opening. .   The planar dimension of the detection sheet is smaller than the planar dimension of the opening, and the opening is not completely covered by the detection sheet, and a gap having a predetermined width is formed. 3. The chemical substance detection apparatus described in 3.   5. The chemical substance detection apparatus according to claim 4, wherein the gap is any value between 3 mm and 5 mm. The detection sheet is formed of paper or a nonwoven fabric containing a reaction solution and a reagent that chemically react with the volatile chemical substance in a dry state,
6. The chemical substance detection apparatus according to claim 1, wherein the color is changed by a chemical reaction with the volatile chemical substance.   7. The chemical substance detection apparatus according to claim 1, wherein the spacer is made of paper or a polymer material.

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