JPH0749342A - Gas exposure indication paper - Google Patents

Abstract

PURPOSE:To form a portable low cost exposure indication paper and to accurately detect the gas intensity without wetting the indication paper by a constitution wherein the elongated indication paper changing color by a specific kind of gas is covered with a transparent film, while an exposure section is formed on an edge portion thereof. CONSTITUTION:An elongated potassium iodide starch paper 2 (indication paper) that changes its color by exposure to a specific kind of gas, e.g. ozone, is covered with transparent films 1, 3 to form an exposure section 2a to be exposed to outer air on an edge portion thereof. A part 3a of the film 3 on the exposure section of the indication paper is removed. When exposing it over a prescribed period of time in the ozone gas, the gas is diffuses into the inside from the exposure section 2a so that the indication paper 2 (potassium iodide starch paper) changes color. The length of a transition interval corresponds to an amount of exposing of the ozone gas, thereby it is possible to easily detect the intensity of ozone by reading the length of the transition interval with a scale 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas exposure indicator which changes color when exposed to a specific type of gas.

[0002]

2. Description of the Related Art In recent years, nosocomial infections in hospitals (nosocomial infections), particularly nosocomial infections due to MRSA (Martha), have become a major social problem. In order to prevent such nosocomial infections, a disinfection device using ozone is being developed.

In this type of apparatus, after supplying ozone into a room or a container, ozone is decomposed by an ozone killer composed of a catalyst.

[0004]

On the other hand, ozone has a strong sterilizing and disinfecting power, but on the other hand, ozone is a harmful gas to the human body when inhaled for a long time even in a minute amount. Therefore, when using a disinfection device using ozone, it is necessary to detect the concentration of residual ozone after use, how much ozone treatment has been performed, and the like. An ozone monitor is used to detect the concentration of ozone.

However, the ozone monitor is expensive and inconvenient to carry and use.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and provide a gas exposure indicator paper which is low in cost and easy to carry.

[0007]

In order to achieve the above object, the present invention is to cover an elongated indicator paper, which is exposed to a specific type of gas and discolors, with a transparent film, and attach it to one end of the elongated indicator paper. The exposed part is exposed to the outside air.

In the present invention, the indicator paper contains an indicator which reacts with a specific type of gas and a compound which gels the indicator.

[0009]

According to the above construction, by exposing the exposed portion of the gas exposure indicator paper for a predetermined time in an atmosphere of a specific type of gas, the exposed portion is exposed to the gas and the gas diffuses from one end of the indicator paper to the inside. At the same time, since the indicator paper changes color, the intensity of the gas can be easily detected by reading the length of this color change area. The gas exposure indicator paper is low in cost and extremely easy to carry because it consists only of an indicator paper and a transparent film.

Further, since the indicator paper contains an indicator that reacts with a specific type of gas and a compound that gels the indicator, the gelled indicator functions as a moisturizer.
It is not necessary to wet the indicator paper with water even for a gaseous oxidative substance, and accurate ozone strength can be detected.

[0011]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 (a) is a plan view of an embodiment of the gas exposure indicator paper of the present invention, and FIG. 1 (b) is a sectional view taken along the line AA.

In FIGS. 1 (a) and 1 (b), reference numeral 1 is a long transparent film (eg, cellophane tape) made of a material that blocks passage of ozone gas. On the transparent film 1, one piece of a long potassium iodide starch paper 2 having a width and a length shorter than that of the transparent film 1 is attached. The potassium iodide starch paper 2 is designed to change color when exposed to ozone gas. Incidentally, the potassium iodide starch paper 2 as the instruction paper is one sheet in the figure, but it may be two or more sheets.

Here, the potassium iodide starch paper 2 is a test paper that has been known for a long time and exhibits a blue-violet color with respect to a solution containing an oxidizing agent. For example, it is prepared by immersing a filter paper in 1 liter of a solution prepared by dissolving 3 g of potassium iodide and 5 g of soluble starch and drying it.

On the transparent film 1 and the potassium iodide starch paper 2, a transparent film 3 having the same shape as the transparent film 1 is attached. This transparent film 3 can be manually removed at a part (left side in the drawing) 3a during use. By removing a part 3a of the transparent film, only one end of the potassium iodide starch paper 2, that is, the exposed part 2a is exposed to the outside air.
That is, the transparent film 3 seals the potassium iodide starch paper 2 when not in use to prevent it from being exposed to ozone gas, and when used, only the exposed portion 2a of the potassium iodide starch paper 2 comes into contact with the outside air. ing.

A scale 4 based on the boundary line of the exposed portion 2a is provided on the transparent film 3 so as to indicate the exposure amount of ozone. Although the scale 4 is written on the transparent film 3, it may be printed on the transparent film 1.

Next, the operation of the embodiment will be described.

In an atmosphere of ozone gas, a part 3a of the transparent film 3 on the exposed portion 2a of the gas exposure indicator paper is removed,
By exposing the potassium iodide starch paper 2 for a predetermined time, the exposed portion 2a of the potassium iodide starch paper 2 is exposed to ozone gas, and the ozone gas diffuses from the exposed portion 2a to the inside and the potassium iodide starch paper 2 is discolored. The length of this color change area corresponds to the exposure amount of ozone gas (since the exposure amount is equal to the time integral of the intensity), the intensity of ozone gas can be easily detected by reading the length scale 4 of this color change area. be able to.
The gas exposure indicator paper consists of potassium iodide starch paper 2 and transparent films 1 and 3, so the cost is low,
And it becomes easy to carry.

(Concrete Example) FIG. 2 is a diagram showing the result of measuring ozone strength using the gas exposure indicator paper of this embodiment.
The horizontal axis represents ozone intensity and the vertical axis represents discoloration length.

Ozone gas from the ozonizer was introduced into a sealed container, and a gas exposure indicator was put in the container to read the scale. Ozone intensity was measured with an environmental ozone monitor. Ozone intensity has 4 conditions (500, 400, 3
00, 30 ppm). Potassium iodide starch paper 2
Has a width of about 2 mm.

As shown in the figure, it can be seen that the ozone intensity and the discoloration length are on one curve even if the exposed ozone intensity is different.

From this curve, the relationship between ozone strength and discoloration length can be seen. Therefore, the ozone strength can be directly read by converting the discoloration length into ozone strength and writing the obtained numerical value on the scale 4.

By the way, when the strength of ozone gas is detected by using the gas exposure indicator paper, if it is directly exposed to ozone gas, the potassium iodide starch paper remains dry.
No clear bluish-purple coloration was observed, and the color changed to a slightly dark brown. For this reason, a clear blue-violet coloration is exhibited when it is wet with water.

However, when an oxidizing substance is contained in water, a reaction occurs and an accurate indication cannot be given.

Therefore, the present inventor, when producing potassium iodide starch paper, adds a compound that gels to potassium iodide as an indicator (polymer absorption polymer) so that the indicator functions as a moisturizer. Tried that. As a result, even a gaseous oxidizing substance shows a clear iodine starch reaction and changes color without getting wet with water, so that the ozone intensity can be accurately detected.

As described above, according to the present embodiment, the elongated indicator paper which changes color when exposed to a specific type of gas is covered with a transparent film, and an exposed portion exposed to the outside air is formed at one end of the elongated indicator paper. Therefore, it is possible to realize a gas exposure indicator paper which is low in cost and easy to carry. In addition, the instruction paper
Since it contains an indicator that reacts with a specific type of gas and a compound that gels the indicator, the indicator functions as a moisturizer, and it is necessary to wet the indicator paper with water even for a gaseous oxidizing substance Is eliminated, and the ozone intensity can be accurately detected.

In this embodiment, ozone gas is used as the specific type of gas and potassium iodide starch paper is used as the indicator paper, but the present invention is not limited to these, and the indicator paper is not limited to this. It goes without saying that other types of indicator paper may be used as long as they are exposed to a type of gas and discolor.

[0028]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) It is possible to realize a gas exposure indicator that is low in cost and easy to carry.

(2) Ozone intensity can be accurately detected without wetting the indicator paper with water.

[Brief description of drawings]

FIG. 1 (a) is a plan view of an embodiment of a gas exposure indicator paper of the present invention, and FIG. 1 (b) is a sectional view taken along the line AA.

FIG. 2 is a diagram showing a result of measuring ozone strength using the gas exposure indicator paper of the present embodiment.

[Explanation of symbols]

 1, 3 Transparent film 2 Indicator paper (potassium iodide starch paper) 2a Exposed part

Claims (2)

[Claims] 1. A gas characterized in that an elongated indicator paper that changes color when exposed to a specific type of gas is covered with a transparent film, and an exposed portion exposed to the outside air is formed at one end of the elongated indicator paper. Exposure instruction paper. 2. The gas exposure indicator paper, wherein the indicator paper contains an indicator that reacts with a gas of a specific type and a compound that gels the indicator.