JPH0769320B2 - Iodine reaction detection method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an iodine reaction utilizing an iodine reaction, for example, a method for detecting an iodine reaction suitable for detecting a latent fingerprint or conducting a chemical experiment.

[0002]

2. Description of the Related Art Conventionally, a method for detecting an iodine reaction utilizing an iodine reaction has been known. In this detection method, an appropriate amount of iodine crystal sealed in a storage container is placed in a glass container, a glass plate is placed on the container, and iodine gas is sublimated to generate iodine gas. Depending on the progress, color reaction on the test object and detection of latent fingerprint are performed. The degree of this detection, that is, the progress of the iodine reaction is visually judged, the glass plate is opened at a proper time to take out the specimen, and immediately after that, the glass container is quickly covered with the glass plate. On the other hand, the iodine crystals remaining in the glass container are transferred to a storage container and sealed and stored.

However, in the above-mentioned conventional detection method,
A relatively large amount of iodine gas scatters during the process of loading iodine crystals from the storage container to the glass container, the process of loading the iodine crystals remaining in the glass container into the storage container, or when opening and closing the glass plate. It has the drawbacks of polluting the environment, damaging the mucous membranes of the nose and throat, and the skin, and corroding metal products due to oxidation.

In the latter method for detecting latent fingerprints, an appropriate amount of iodine crystals are heated in an iodine gas spraying device at an appropriate temperature to promote sublimation, and the sublimated iodine gas is converted into an air stream generated by a fan. A detection method of mixing and spraying on a sample is also known. However, with this detection method,
The degree of scattering of iodine gas becomes larger than that of the above-described detection method, and there is a problem that the harmful effects on the mucous membrane of the nose and throat, the skin, and the like and the harmful effects such as oxidative corrosion are magnified.

In addition, the above-mentioned detection method has a large number of parts for detection, and these parts are bulky, which makes them inconvenient to carry, and they are not suitable for detection in some places. Furthermore, work to put out detection equipment such as a glass container, a cover glass plate, or an iodine gas blowing device from the storage location to the specified detection work position and set it up in the storage location after the detection work is completed. Is relatively complicated, resulting in poor workability. Moreover, at the time of detection work, setup, storage work in a storage place, etc.
It may also damage the detection equipment. That is, it has a drawback of poor handleability.

[0006]

The problem to be solved is that the scattering of iodine gas is high, the work environment is polluted and the mucous membrane of the nose and throat or the skin is damaged, and the metal products are corroded by the oxidizing action. In addition, the number of parts for detection is large, and these parts are bulky, which makes them inconvenient to carry. Therefore, they are unsuitable for, for example, fingerprint detection in the field and have poor handleability.

[0007]

According to a first aspect of the present invention, an iodine crystal holding substrate in which iodine crystals are held is previously charged and sealed in a non-breathable bag body. The feature is that after loading the sample into the container, it is resealed and the iodine reaction is carried out for a predetermined time, suppressing the scattering of iodine gas, reducing the number of parts for detection, and reducing the bulk and carrying it. Therefore, the object of facilitating the handling and improving the handleability and easily executing the detection of the iodine reaction was achieved.

The invention of claim 2 is characterized in that the non-air-permeable bag is made of a transparent synthetic resin sheet, and the progress of the iodine reaction can be surely judged visually. .

The invention of claim 3 is characterized in that the iodine crystal holding substrate is constituted by a woven cloth or a braided body of glass fibers. Improved corrosion resistance.

[0010]

According to the invention of claim 1, the scattering of iodine gas can be limited to a short time only when the sample is loaded into the non-permeable bag or when the sample is taken out from the non-permeable bag. Since the opening area of the non-breathable bag for loading / unloading the sample can be set small, the scattering of iodine gas can be minimized. Further, since the non-air-permeable bag body is loaded with the iodine crystal holding substrate and has a thin and highly flexible structure, the number of parts is small and the volume is low, so that it is easy to carry and the handleability is also improved.

According to the second aspect of the present invention, the progress of the iodine reaction inside the non-air-permeable bag can be visually confirmed.

According to the third aspect of the present invention, since the iodine crystals can be held in the weave of the glass fiber woven cloth or the weave of the glass fiber braid, the holding function of the iodine crystal holding substrate is enhanced and the iodine crystal holding substrate is effective. The usage period can be extended. Moreover, since the corrosion resistance is improved by the acid resistance of the glass fiber itself, the life extension of the iodine crystal holding substrate can be achieved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a non-air-permeable bag body for carrying out the detection method according to the present invention, and FIG. 2 is a vertical side view.
In these figures, the non-breathable bag body 1 is formed in a rectangular shape by a transparent sheet having a high non-breathing property, and an opening 1A is provided on one side of the non-breathable bag body 1 and the other three sides are heat-sealed 1B. It is configured like a bag. As a transparent sheet with a high non-venting property, a polyamide resin sheet with a thickness of 15 μm and a thickness of 5
After laminating a vinylidene chloride resin sheet 11 having a thickness of 11 and a polyethylene resin sheet 12 having a thickness of 55 μ, the vinylidene chloride resin sheet 11 and the polyamide resin sheet 10 and the polyethylene resin sheet are thermocompression bonded. -It is recommended to have a transparent three-layer structure in which the gland 12 is fused. Therefore, the non-breathable bag 1 is made of polyamide resin sheet 10.
After the two three-layer structure sheets are polymerized,
It is obtained by leaving the opening 1A and heat-sealing the other three sides 1B. As a result, excellent non-breathability and high transparency are ensured, and the wear resistance of the non-breathable bag body 1 is improved by the polyamide resin sheet 10 having high wear resistance, and the non-breathable bag due to abrasion is improved. Damage and breakage of the body 1 can be avoided.

FIG. 3 shows the iodine crystal holding substrate 2. The iodine crystal holding substrate 2 is made of a woven glass fiber cloth. Of course, a glass fiber braid may also be used. As shown in FIG. 4, the iodine crystal holding substrate 2 holds the iodine crystals 3, 3, ... Uniformly and evenly. The treatment for holding the iodine crystal-holding substrate 2 on the iodine crystal-holding substrate 2 is carried out by adding the iodine crystal-holding substrate 2 to an organic solvent (ethyl ether) in which the iodine crystals 3, 3 ... Are dissolved in a supersaturated state. It is carried out by a procedure in which the organic solvent value is forcibly volatilized by blowing air after being soaked, and only the iodine crystals 3, 3 ... Are left.

The iodine crystal holding substrate 2 holding the iodine crystals 3, 3 ... Is stored by placing it in the non-permeable bag 1 and sealing it. That is, as shown in FIG.
The iodine crystal holding substrate 2 is loaded through the opening 1A of the non-air-permeable bag body 1, and then the opening 1A is opened and closed airtightly by a known clip 4 as shown in FIGS. 6 and 7. By changing the sealing structure using the clip 4 as described above, a hot melt layer (not shown) is formed on the inner surface of the opening 1A, and the hot melt layer is welded by a known heat sealer. It may be a hermetically sealed structure.

Next, the procedure for detecting a latent fingerprint which is carried out using the method for detecting an iodine reaction according to the present invention will be described. First,
The clip 4 is removed from the non-breathable bag body 1 shown in FIGS. 6 and 7 to open the opening 1A. Next, after the specimen 5 is loaded into the non-air-permeable bag body 1 through the opening 1A (see FIG. 8), the clip 1 quickly closes the opening 1A (see FIG. 9). Since the inside of the non-air-permeable bag 1 is in an iodine gas atmosphere due to the sublimation of the iodine crystals 3, 3 ... Held on the iodine crystal holding substrate 2, the iodine reaction is carried out. The degree of progress of the iodine reaction, that is, the degree of detection of the latent fingerprint can be easily confirmed by seeing through the transparent non-air-permeable bag 1. If a latent fingerprint is detected by the iodine reaction, the non-breathable bag 1 to the clip 4
Then, the opening 1A is opened, the specimen 5 in which the latent fingerprint is detected is taken out, and the opening 1A of the non-air-permeable bag 1 is quickly closed by the clip 4. On the other hand, non-breathable bag 1
When the sample 5 extracted from the sample contains starch, the detection fingerprint is fixed by performing a fixing operation such as blowing of breath, humidification by a well-known ultrasonic humidifier or immersion in hexane.

Since the latent fingerprint can be detected by such a procedure, the scattering of iodine gas can be prevented when the specimen 5 is loaded into the non-breathable bag body 1 and from the non-breathable bag body 1. It can be limited to a short time only when taking out. Moreover, since the opening area of the opening 1A for loading / unloading the sample 5 can be set small, the scattering of iodine gas can be suppressed to the minimum. Therefore, it is possible to avoid the occurrence of harmful effects such as a large amount of iodine gas being scattered and contaminating the work environment, damaging the mucous membranes of the nose and throat, the skin, or corroding metal products due to the oxidizing action. Further, since the iodine crystal holding substrate 2 is inserted in the non-breathable bag body 1, the number of parts can be reduced. Moreover, since the thin and highly flexible structure facilitates carrying and improves handleability, it can be easily applied to fingerprint detection in the field.

On the other hand, the non-air-permeable bag body 1 is a transparent three-layer structure in which the polyamide resin sheet 10 and the polyethylene resin sheet 12 are fused to the vinylidene chloride resin sheet 11 by thermocompression bonding. Since the progress of the iodine reaction in the interior can be visually confirmed, the detection work can be made accurate and easy. Further, since the iodine crystal holding substrate 2 is made of a glass fiber woven cloth, iodine crystals 3, 3 are formed in the weave of the glass fiber woven cloth.
...... can be held. Therefore, the iodine crystal holding substrate 2
The iodine crystal 3, 3 ... Retaining function is enhanced, the effective use period of the iodine crystal holding substrate 2 can be extended, and the acid resistance property of the glass fiber itself improves the corrosion resistance. A life extension of 2 can also be achieved.

The method of detecting the iodine reaction according to the present invention has been described with respect to the method of detecting the latent fingerprint, but the method of detecting the iodine reaction is not limited to the method of detecting the latent fingerprint. It can also be used in the iodine reaction experiment carried out in the above-mentioned experiment, paper chromatography in microanalysis, and coloring reagent in thin layer chromatography.

[0020]

As described above, according to the first aspect of the present invention, since the scattering of iodine gas can be reduced to the minimum, it is possible to avoid the contamination of the work environment and the corrosion of metal products and the like due to the oxidizing action. Moreover, since the number of parts is small and the volume is low, it is easy to carry and the handling is easy.
It is possible to easily detect the reaction regardless of location.

According to the second aspect of the present invention, since the progress of the iodine reaction inside the air-impermeable bag can be visually confirmed, the work can be made accurate and easy.

According to the third aspect of the present invention, since the iodine crystal can be held in the weave of the glass fiber woven cloth or the weave of the glass fiber braid, the holding function of the iodine crystal holding substrate is enhanced, and the iodine crystal holding substrate is effectively used. Can be extended. This is also ensured by achieving an extended life of the iodine crystal holding substrate due to the acid resistance properties of the glass fiber itself.

[Brief description of drawings]

FIG. 1 is a front view showing a non-breathable bag.

2 is a vertical side view of FIG.

FIG. 3 is a front view showing an iodine crystal holding substrate.

FIG. 4 is a partially enlarged view of an iodine crystal holding substrate.

FIG. 5 is a front view showing a state where an iodine crystal holding substrate is loaded in a non-breathable bag.

FIG. 6 is a front view showing a state in which the opening of the non-air-permeable bag is closed.

FIG. 7 is an enlarged vertical side view of a closed opening.

FIG. 8 is a front view showing a loading state of a sample.

FIG. 9 is a front view showing a state in which the opening of the non-air-permeable bag body is closed after the loading of the sample.

[Explanation of symbols]

 1 Non-air-permeable bag 2 Iodine crystal holding substrate 3 Iodine crystal 5 Sample

Claims (3)

[Claims] 1. A non-breathable bag body is preliminarily charged with an iodine crystal holding substrate holding iodine crystals and sealed,
A method for detecting an iodine reaction, which comprises loading a sample into the non-air-permeable bag, sealing the sample again, and carrying out an iodine reaction for a predetermined time. 2. The method for detecting an iodine reaction according to claim 1, wherein the non-breathable bag is formed of a transparent synthetic resin sheet. 3. The method for detecting iodine reaction according to claim 1, wherein the iodine crystal holding substrate is made of a glass fiber woven fabric or a braided body.