JP2007139497A - Detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detector capable of simply detecting hexavalent chromium. <P>SOLUTION: The detector 1 has an elution part 2 for eluting hexavalent chromium from an evaluation target and a reaction part 3 containing a substance such as diphenylcarbazide or the like discolored upon the reaction with hexavalent chromium eluted in the elution part 2. When hexavalent chromium being an evaluation target is detected using the detector 1, the presence and absence of hexavalent chromium being the evaluation target can be discriminated from the discoloration of the reaction part 3 only by bonding the elution part 2 of the detector to the evaluation target without decomposing or processing the evaluation target. By this constitution, hexavalent chromium can be easily and rapidly detected at a low cost. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a detector, and more particularly to a detector for detecting hexavalent chromium.

  Conventionally, chromate treatment has been widely used for plating such as screws and sheet metal for the purpose of improving the corrosion resistance. In the past, hexavalent chromium was mainly used for chromate treatment. However, in order to improve safety, hexavalent chromate treatment tends to be regulated now. Valuation chromate treatment has begun to attract attention. Chromate-treated products are widely used at present, but it is considered that a method for determining the presence or absence of chromium, especially the presence or absence of hexavalent chromium, in the members and parts of various products will be required in the future.

  As a method for detecting hexavalent chromium in parts, for example, diphenylcarbamate is used to examine the discoloration state (color and absorbance) by eluting hexavalent chromium into the liquid from such parts and reacting it with diphenylcarbazide. There are a gid method, a method of appropriately processing parts and the like, and an evaluation method using an analytical instrument such as AES (Auger Electron Spectroscopy), SAM (Scanning Auger Electron Microscopy), or XPS (X-ray Photoelectron Spectroscopy).

Conventionally, various detection methods have been proposed in various fields. For example, a method of simply measuring a nitrite ion concentration using a nitrite ion detection paper (see Patent Document 1), moisture on one side of a water-permeable film. A method of detecting moisture using a moisture detection label provided with a color developing layer that develops color (see Patent Document 2), and a gas detector carrying a detection reagent that develops color on contact with a gas component on a film-like support A method of detecting gas using the method (see Patent Document 3) has been proposed.
JP-A-2005-76038 Japanese Patent Laid-Open No. 10-90244 Japanese Patent Laid-Open No. 9-210985

  When multiple parts are obtained at once, the presence or absence of hexavalent chromium can be known by using the attached quality data and analysis / evaluation such as sampling inspection. Can be guaranteed.

  However, there is a possibility that an already assembled product or an OEM (Original Equipment Manufacture) product supplied from another manufacturer contains a mixture of chromated parts and other parts. In order to know whether hexavalent chromium is used or not, it is necessary to disassemble the assembly and analyze and evaluate each disassembled part. In particular, when hexavalent chromium is detected using an analytical instrument, it is often necessary to disassemble the disassembled parts into a shape suitable for each analytical instrument. As described above, in order to obtain quality assurance data for hexavalent chromium such as an assembled product, a great amount of labor and time are required, and the accompanying increase in cost cannot be ignored.

  In addition, the trivalent chromate treated product, which is a substitute for the hexavalent chromate treated product, is difficult to distinguish from the hexavalent chromated treated product in appearance. The same problem arises because each must be analyzed and evaluated. Furthermore, at present, it is a transition period from the hexavalent chromate treatment to the trivalent chromate treatment, and hexavalent chromium may be mixed into the trivalent chromate film.

  This invention is made | formed in view of such a point, and it aims at providing the detection body which can detect hexavalent chromium easily.

  In the present invention, in order to solve the above-mentioned problem, in the detection body used for detection of hexavalent chromium, an elution part for elution of hexavalent chromium from the detection object in contact with the detection object, and the elution part And a reaction part containing a substance for detecting the eluted hexavalent chromium.

  According to such a detection object, hexavalent chromium is eluted from the detected object at the elution part that contacts the detected object, and the substance contained in the reaction part is dissolved in the elution part. Is detected. Since the presence or absence of hexavalent chromium in the detected object can be determined by bringing the elution portion into contact with the detected object, the detection of hexavalent chromium can be easily performed.

  In the present invention, the detector has a structure having an elution part for eluting the hexavalent chromium of the object to be detected and a reaction part containing a substance for detecting the eluted hexavalent chromium. As a result, the presence or absence of hexavalent chromium in the detected body can be determined only by bringing the elution portion into contact with the detected body without disassembling or processing the detected body. Therefore, hexavalent chromium can be detected easily and quickly at a low cost.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the detection body used for detection of hexavalent chromium and the principle of detection will be described.
FIG. 1 is a schematic view of a detector.

  The detector 1 has a configuration in which a layered elution part 2 and a reaction part 3 are laminated. The detection body 1 is formed in, for example, a seal shape, and the elution part 2 side is attached to an evaluation target that is a detection target, and all or a part of the elution part 2 is adhered to the surface of the evaluation target. Can be done.

  The elution part 2 contains water or a chemical solution (acetone, ethanol, etc.) for eluting hexavalent chromium from the evaluation object when it comes into close contact with the surface of the evaluation object. The elution part 2 can hold water and chemical solution for elution of hexavalent chromium for a certain period of time, and does not fix hexavalent chromium eluted from the surface to be evaluated by such water or chemical solution. Consists of materials. A configuration example of the elution part 2 will be described later.

  The reaction unit 3 contains a substance (color changing agent) that changes color (including color development, the same applies hereinafter) by reacting with hexavalent chromium, for example, diphenylcarbazide. In the detector 1, when the eluted hexavalent chromium moves through the elution part 2 through water or chemicals and reaches the reaction part 3, and reacts with the color change agent contained in the reaction part 3, the reaction part 3. Has become discolored. A configuration example of the reaction unit 3 will be described later.

  The planar size of the detection body 1 can be arbitrarily set according to the evaluation target. For example, when used for a screw, the size of the detector 1 is a size that can be affixed to the screw head, or used for a larger plate or the like. For example, the size may be set according to the size. Moreover, although the thickness of the detection body 1 can also be set arbitrarily, in consideration of the elution amount of hexavalent chromium and the like, it is desirable to appropriately set the thickness, particularly the elution portion 2.

  In addition, although the detection body 1 of the above structures is based also on the material, for example, the reaction part 3 is formed in a sheet form on the sheet-like elution part 2, and the elution part on the sheet-like reaction part 3 is formed. 2 is formed into a sheet shape, or the sheet-like elution part 2 and the sheet-like reaction part 3 are bonded together.

  FIGS. 2 to 4 are diagrams for explaining the flow of a method for detecting hexavalent chromium using a detector, wherein FIG. 2 is a schematic diagram when the detector is affixed, FIG. 3 is a schematic diagram when hexavalent chromium is eluted, FIG. 4 is a schematic view when the reaction part is discolored.

For example, it is assumed that the evaluation object 4 has a hexavalent chromate film 6 formed on the surface of a base layer 5 that is a base layer or a plating layer.
When performing detection using the detection body 1, first, as shown in FIG. 2, the detection body 1 is placed on the surface of such an evaluation object 4, here the hexavalent chromate film 6, and the elution portion 2 is provided. Paste it in close contact. At that time, the elution part 2 contains water or a chemical solution in advance, or impregnates the detection body 1 with water or a chemical solution immediately before being attached to the surface of the evaluation object 4 to contain water or a chemical solution. I will let you.

  When the detector 1 is affixed to the hexavalent chromate film 6, hexavalent chromium starts to elute from the hexavalent chromate film 6 by water or chemicals contained in the elution part 2 as shown in FIG. 3. For convenience, FIG. 3 shows a region in which the hexavalent chromium in the elution portion 2 is eluted in a layered manner.

  Then, when a certain period of time has passed and the eluted hexavalent chromium moves through the elution part 2 and reaches the reaction part 3, as shown in FIG. 4, the color changing agent contained in the reaction part 3 In response, the reaction part 3 changes color. The presence of hexavalent chromium can be detected by this discoloration.

  Here, the evaluation object 4 having the hexavalent chromate film 6 is taken as an example. However, when the same conditions are processed for an evaluation object that does not contain hexavalent chromium, the reaction section 3 normally does not change color. Therefore, it can be known that the evaluation object does not contain hexavalent chromium.

The discoloration of the reaction unit 3 can be determined by visual observation, and can also be determined using a spectrophotometer if the amount of hexavalent chromium eluted is equal to or greater than a certain level.
As described above, by using the detection body 1 as described above, the detection body 1 is simply attached to the evaluation object 4 without disassembling or processing the evaluation object 4, and the six in the film. The presence or absence of valent chromium can be determined, and the detection of hexavalent chrome can be performed very easily and quickly.

  Trivalent chromium is less likely to elute in water or the like than hexavalent chromium. Therefore, if the detector 1 is attached to the surface of a film that is a trivalent chromate film, it is possible to determine whether or not hexavalent chromium is mixed in the film.

  Further, the diphenylcarbazide solution changes color by reacting with zinc plating in addition to hexavalent chromium. For this reason, in the trivalent chromate film in which structural defects due to cracks, peeling, and the like are present, a discoloration reaction between the diphenylcarbazide solution and galvanization occurs in the detector 1, and as described later, this detector 1 Can also be used to determine the quality of the trivalent chromate film (see the second embodiment).

  In the above description, the detection body 1 in which the lamellar elution part 2 and the reaction part 3 are laminated is illustrated, but these do not necessarily need to be clearly divided into two layers, and the above-mentioned one layer is the above. It is also possible to adopt a configuration having both functions of the elution part 2 and the reaction part 3 as described above.

Hereinafter, a configuration example of the detection body will be described.
First, the structure of the elution part of a detection body is demonstrated.
FIG. 5 is a diagram illustrating a first configuration example of the detector.

  The detection body 10 shown in FIG. 5 has a configuration in which holes 11 a are provided in the elution portion 11. The material of this elution part 11 will not be specifically limited if it does not react with the water and chemical | medical solution for hexavalent chromium elution, and does not fix the eluted hexavalent chromium.

  When hexavalent chromium is detected using such a detection body 10, first, water and a chemical solution for elution of hexavalent chromium are put into the holes 11a before the detection body 10 is attached to an evaluation target. Try to put it in. This can be easily performed by, for example, dropping water or a chemical solution from the elution portion 11 side or impregnating the elution portion 11 side with water or a chemical solution. And the detection body 10 is affixed on the surface of evaluation object so that the elution part 11 closely_contact | adheres. In that case, the detection body 10 comes to be affixed on the surface of evaluation object by the surface tension of the water and chemical | medical solution which are contained in the elution part 11. FIG.

  As a result, when a film containing hexavalent chromium is formed on the surface to be evaluated, the hexavalent chromium is eluted from the film by the water or the chemical solution in the pores 11a, and reaches the reaction section 3. When a predetermined reaction occurs, the reaction part 3 changes color. On the other hand, when the film containing hexavalent chromium is not formed on the surface to be evaluated, the reaction part 3 usually does not change color.

  Here, the configuration in which only one hole 11a is formed in the elution part 11 is illustrated, but if such a hole can easily put water or a chemical into the elution part, A plurality of them may be formed.

FIG. 6 is a diagram illustrating a second configuration example of the detection body.
The detector 20 shown in FIG. 6 has an elution portion 21 made of a porous material such as a mesh or a filter. In addition, the elution part 21 is made of a material that is porous in this way and does not react with water or chemicals for elution of hexavalent chromium and does not fix the eluted hexavalent chromium.

  In the case of detecting hexavalent chromium using such a detector 20, as in the case of the detector 10 shown in FIG. 5, the hexavalent chromium is eluted in the elution portion 21 before being attached to the evaluation object. So that it is impregnated with water or chemicals for use. And the detection body 20 is affixed on the surface of evaluation object using the surface tension of the water or chemical | medical solution, and the presence or absence of the hexavalent chromium of the evaluation object is discriminate | determined from the discoloration state of the reaction part 3. FIG.

FIG. 7 is a diagram showing a third configuration example of the detection body.
The detection body 30 shown in FIG. 7 is configured using a polymer whose elution portion 31 has water retention. In addition to the water retention property, the elution part 31 is made of a polymer that does not react with hexavalent chromium elution water or chemicals and does not fix the eluted hexavalent chromium.

  When hexavalent chromium is detected using such a detector 30, the elution part 31 is impregnated with water or a chemical solution before being attached to an evaluation target, and then the detection is performed. The body 30 is affixed to the surface to be evaluated. And the presence or absence of the hexavalent chromium of the evaluation object is discriminate | determined from the discoloration state of the reaction part 3. FIG.

  The water content of the water-retaining polymer can be controlled in advance by controlling the molecular weight and the like. If this is utilized, it is possible to control the amount of hexavalent chromium elution water or chemical solution contained in the elution part 31. If the amount of water or chemical contained in the elution part 31 is controlled to be constant, the amount of liquid at the time of elution of hexavalent chromium can be made constant even if the evaluation object changes.

FIG. 8 is a diagram illustrating a fourth configuration example of the detection body.
In the detection body 40 shown in FIG. 8, the elution portion 41 is configured using a microcapsule 41a. It should be noted that the water and chemical solution for elution of hexavalent chromium can be held for a certain period of time in the elution part 41 excluding the microcapsule 41a, and does not react with the water or chemical solution for elution of hexavalent chromium. What is used is one that does not fix the hexavalent chromium that can be embedded in the microcapsule 41a.

  The microcapsule 41a can contain, for example, hexavalent chromium elution water or a chemical solution. Various forms can be used for the microcapsule 41a, such as a microcapsule 41a that discharges the water or chemical liquid therein when it is destroyed, or a substance that gradually leaches out the water or chemical liquid without destruction. .

  When hexavalent chromium is detected using such a detector 40, the microcapsule 41a is destroyed to release water or chemicals therein before being attached to an evaluation target, or the microcapsule 41a is released. Water or chemicals are leached from the surface and pasted on the surface to be evaluated. And the presence or absence of the hexavalent chromium of the evaluation object is discriminate | determined from the discoloration state of the reaction part 3. FIG.

  In the form in which the microcapsule 41a is destroyed and water or a chemical solution is discharged, it is not necessary to supply the elution part 41 with water or a chemical solution from the outside so that the evaluation can be performed more easily. . Moreover, in the form in which water or a chemical solution is leached from the microcapsule 41a, it becomes possible to perform a long-term evaluation using the phenomenon.

  In addition, it is possible to enclose water or a chemical solution in the microcapsule 41a and dissolve the microcapsule 41a with the chemical solution or water before attaching the detection body 40 to the evaluation target. In this case, when the microcapsule 41a is dissolved with the chemical solution or water, and the chemical solution or water is mixed with the water or the chemical solution contained in the microcapsule 41a, the elution part 41 contains the chemical solution with a predetermined composition. It is also possible to control so that Further, in order to dissolve the microcapsule 41a, another solvent or the like may be used in addition to the chemical solution and water.

Next, the structure of the reaction part of a detection body is demonstrated.
FIG. 9 is a diagram illustrating a fifth configuration example of the detection body.
In the detection body 50 shown in FIG. 9, the reaction part 51 is configured using a resin, and the resin contains a color changing agent such as diphenylcarbazide.

  The resin used in such a reaction part 51 is capable of discriminating the color change when hexavalent chromium reacts with the color change agent, and holds water or chemical solution for elution of hexavalent chromium in the elution part 2 for a certain period of time. For example, PET (Poly Ethylene Terephthalate) or the like can be used.

Note that the elution parts 11, 21, 31, and 41 illustrated in FIGS. 5 to 8 can be applied to the elution part 2 of the detection body 50.
FIG. 10 is a diagram illustrating a sixth configuration example of the detector.

  A detection body 60 shown in FIG. 10 is configured using a microcapsule 61, and a discoloring agent such as diphenylcarbazide is included in the microcapsule 61. Such a microcapsule 61 is embedded in the elution part 2.

  When hexavalent chromium is detected using such a detector 60, the microcapsule 61 is broken, gradually oozed out of the microcapsule 61, or with water or chemicals used for elution of hexavalent chromium. The color-changing agent is released into the elution part 2 using a method such as dissolving 61. This is affixed to the surface of the evaluation object, and the presence or absence of discoloration is observed to determine the presence or absence of hexavalent chromium. In such a configuration, since the color changing agent is released into the elution part 2, when hexavalent chromium is eluted from the evaluation target, the color change is seen relatively quickly and the hexavalent chromium is detected quickly. Is possible.

  In addition, the elution part 2 of such a detector 60 can hold water and chemical solution for elution of hexavalent chromium for a certain period of time, and does not react with water and chemical solution for elution of hexavalent chromium and is eluted. The material is not particularly limited as long as it does not fix hexavalent chromium and can embed the microcapsule 61 therein.

Next, other configuration examples of the detection body will be described.
FIG. 11 is a diagram illustrating a seventh configuration example of the detector.
A detector 70 shown in FIG. 11 includes an elution part 71 and a reaction part 72, an adhesive layer 73 provided around the elution part 71 and a reaction part 72, and a translucent film 74 provided on the surface.

Various forms as described above can be applied to the elution part 71 and the reaction part 72, respectively.
The adhesive layer 73 strongly adheres the detector 70 to the surface to be evaluated, adheres the translucent film 74 to the surface, and further contains water for elution of hexavalent chromium contained in the elution portion 71. It is provided for the purpose of preventing chemicals from evaporating. The material is not particularly limited. For example, PVA (Poly Vinyl Alcohol) that has been widely used as an adhesive can be used.

  The translucent film 74 serves as a protective film that protects the reaction portion 72 and the like from the outside and prevents water and chemical solution for elution of hexavalent chromium contained in the elution portion 71 from being evaporated. The translucent film 74 is preferably colorless and transparent so that when the hexavalent chromium is detected, the discoloration of the reaction portion 72 can be easily confirmed. For example, a PET film or the like is used.

  According to the detection body 70 having such a configuration, the adhesion of the adhesive layer 73 can surely be brought into close contact with the surface to be evaluated. Furthermore, due to the sealing effect by the adhesive layer 73 and the translucent film 74, it is possible to suppress the evaporation of water and chemicals contained in the elution portion 71 and to secure a long time required for detection of hexavalent chromium. .

  In addition, such a detector 70 forms the laminated body of the elution part 71 and the reaction part 72 of a layer form, for example, forms the adhesive bond layer 73 in the side surface, and also has a translucent film on the reaction part 72 side. It can be formed using a method such as sticking.

FIG. 12 is a diagram illustrating an eighth configuration example of the detector. In FIG. 12, the same elements as those shown in FIG. 11 are denoted by the same reference numerals, and detailed description thereof is omitted.
The detection body 80 shown in FIG. 12 has the same configuration as the detection body 70 shown in the seventh configuration example, but has an elution portion 81 configured using a light-impermeable material. This is different from the detector 70 shown in the seventh configuration example. For the elution part 81, for example, a ceramic filter or the like can be used.

  According to the detection body 80 having such a configuration, since the elution portion 81 is opaque, when the hexavalent chromium is detected, the presence or absence of the discoloration of the reaction portion 72 and the degree thereof are determined on the evaluation target surface. It is possible to recognize more clearly by suppressing the influence of color.

FIG. 13 is a diagram illustrating a ninth configuration example of the detector. In FIG. 13, the same or equivalent elements as those shown in FIG. 11 are denoted by the same reference numerals, and detailed description thereof is omitted.
The detector 90 shown in FIG. 13 includes the pH evaluation unit configured by the elution unit 71b and the pH measurement unit 91 in addition to the hexavalent chromium detection unit configured by the elution unit 71a and the reaction unit 72. 7 is different from the detector 70 shown in the configuration example of FIG. The cells of the hexavalent chromium detection part and the pH evaluation part are separated by an adhesive layer 73, and the outer periphery and the surface are sealed by the adhesive layer 73 and the translucent film 74, respectively.

A conventionally known pH indicator can be used for the pH measuring unit 91, and it is configured by mixing it with a resin or including it in a piece of paper.
According to the detector 90 having such a configuration, the presence or absence of hexavalent chromium can be determined on the hexavalent chromium detection unit side, and the pH at the time of elution of hexavalent chromium can be measured on the pH evaluation unit side. It becomes like this.

FIG. 14 is a diagram illustrating a tenth configuration example of the detection body. In FIG. 14, the same or equivalent elements as those shown in FIG. 11 are denoted by the same reference numerals, and detailed description thereof is omitted.
The detection body 100 shown in FIG. 14 is provided with a plurality of elution portions 71c, 71d, 71e, 71f, 71g to which a drug for adjusting pH is added, and the detection shown in the seventh configuration example is provided. It is different from the body 70. The cells composed of the elution parts 71c, 71d, 71e, 71f, 71g and the reaction part 72 are separated from each other by the adhesive layer 73, and the outer periphery and the surface are sealed by the adhesive layer 73 and the translucent film 74, respectively. It has been stopped.

  Each elution part 71c, 71d, 71e, 71f, 71g is added with a pH-adjusting chemical so that the internal liquid has a different pH when water or chemicals for elution of hexavalent chromium is supplied. ing.

  According to the detection body 100 having such a configuration, hexavalent chromium can be detected under a plurality of pH conditions. Therefore, for example, it is possible to acquire information on which pH condition the hexavalent chromium is likely to elute. Such information is useful for knowing the influence of external environment such as acid rain on parts and the like.

FIG. 15 is a diagram showing an eleventh configuration example of the detection body. In FIG. 15, the same or equivalent elements as those shown in FIG. 13 are denoted by the same reference numerals, and detailed description thereof is omitted.
The detector 110 shown in FIG. 15 includes elution parts 71h and 71i to which a pH adjusting agent is added so that the pH conditions are different from those of the elution parts 71a and 71b. It differs from the detector 90 shown in the ninth configuration example in that a reaction unit 72 and a pH measurement unit 91 are provided. Also in the detection body 110, the cells are separated from each other by the adhesive layer 73, and the outer periphery and the surface are sealed by the adhesive layer 73 and the translucent film 74, respectively.

  According to the detection body 110 having such a configuration, the elution parts 71a and 71b, the reaction part 72 and the pH measurement part 91 provided respectively, detect hexavalent chromium in a certain pH environment and evaluate the pH at that time. The elution parts 71h and 71i, the reaction part 72 and the pH measurement part 91 provided respectively, can detect hexavalent chromium in another pH environment and can evaluate the pH at that time. It becomes like this.

Then, the specific example which implemented the detection of hexavalent chromium is demonstrated.
First, the first embodiment will be described.
Here, iron, glass (SiO ₂ ), stainless steel (SUS304), a trivalent chromate film and a hexavalent chromate film were used as samples to be evaluated. The trivalent chromate film and the hexavalent chromate film are both formed on a galvanized layer formed on an iron base layer.

A cotton having a plane size of about 5 mm square (about 5 mm long × about 5 mm wide) was placed on the surface of each sample, and a diphenylcarbazide solution (diphenylcarbazide: 0.4 g, acetone: 20 ml, About 0.2 cm ^{3 of} water (20 ml) was added dropwise. Then, the diphenylcarbazide solution was dropped, and the discolored state after 10 minutes and the discolored state after drying of the diphenylcarbazide solution were examined. The results are shown in Table 1. Here, cotton is used as the detection body, and the color of each sample itself does not affect the presence / absence of discoloration and the determination of the degree thereof.

  From Table 1, all samples were white cotton before the diphenylcarbazide solution was dropped, but only 10 minutes after the diphenylcarbazide solution was dropped, only the hexavalent chromate film changed to light pink. As for other samples, no discoloration was observed, and the cotton remained white.

  In addition, after the diphenylcarbazide solution was dried, discoloration further progressed in the hexavalent chromate film, and a brownish purple color was exhibited. After the diphenylcarbazide solution was dried, the other samples were also discolored, showing light brown purple with iron, light purple with glass, light purple with stainless steel, and deep purple with a trivalent chromate film. However, the degree of discoloration was greatest for the hexavalent chromate film.

  Thus, hexavalent chromium could be detected by a simple method in which a diphenylcarbazide solution was dropped onto cotton. After the diphenylcarbazide solution is dried, all samples will change color although the color and degree of discoloration will be different.Hexavalent chromium should be detected before the dropped diphenylcarbazide solution is dried. Is desirable.

Next, a second embodiment will be described.
Here, as a sample to be evaluated, a galvanized sample formed on an iron base layer, and a trivalent chromate film and a hexavalent chromate film on the sample were each used an abrasive having a particle size of # 1000, and a chromate layer was formed on the surface. Polished so that the galvanized layer and the galvanized layer coexist.

Then, a cotton having a plane size of about 5 mm square is placed on the surface of the galvanized sample and the trivalent chromate film and the hexavalent chromate film after the polishing, respectively, and a diphenylcarbazide solution (diphenylcarbazide: 0.4 g) is placed on the surface. acetone: 20 ml, water: 20 ml) to about 0.2 cm ³ was added dropwise to examine the color change after drying and after the dropwise addition 10 minutes, respectively. The results are shown in Table 2.

  According to Table 2, all the samples were white in cotton before the diphenylcarbazide solution was dropped, but after 10 minutes from the dropping of the diphenylcarbazide solution, the galvanized sample, the trivalent chromate film, and the hexavalent film. Discoloration to purple was observed in all chromate films. In addition, after drying, the galvanized sample and the trivalent chromate film were observed to change to dark purple, and the hexavalent chromate film was changed to brown.

  Thus, when the trivalent chromate film is polished to some extent, the zinc plating that is the base layer of the trivalent chromate film is exposed, so that the diphenylcarbazide solution reacts with the zinc plating and changes color 10 minutes after dropping. Therefore, this detection method can also be used as a method for determining the presence or absence of structural defects due to cracking, peeling, or the like of the trivalent chromate film.

  As described above, the detection body is configured in a seal shape here, and is attached to the detection body at the time of detection. Accordingly, it is possible to detect hexavalent chromium by visual observation of discoloration or the like by attaching the detection body to the detection body without disassembling or processing the detection body. Therefore, the presence or absence of hexavalent chromium can be easily and efficiently discriminated, and the cost of analysis and evaluation can be reduced.

  In addition, the detector can be used to determine the presence or absence of a defect in the trivalent chromate layer, whereby quality control of the trivalent chromate layer can be easily and quickly performed at low cost.

  In the above description, detection of chromium has been described as an example. However, when detecting other elements such as lead, mercury, cadmium, etc., detection is performed using a detector having the same configuration as described above. It is also possible to do this. That is, by using a sensing element that, when affixed to a sensing object, elutes a predetermined element from the surface and makes it possible to artificially or mechanically determine the presence of the eluted predetermined element by discoloration, etc. It becomes possible to easily detect various elements.

  In the above explanation, an example of detecting hexavalent chromium by visual observation of discoloration, that is, an example in which a reaction part is formed of a material that reacts with hexavalent chromium and changes color, has reacted with hexavalent chromium. The material is not limited to this as long as the material can be identified.

(Supplementary note 1) In the detector used for detecting hexavalent chromium,
An elution part for eluting hexavalent chromium from the detected object in contact with the detected object;
A reaction part containing a substance for detecting hexavalent chromium eluted in the elution part;
A detection body characterized by comprising:

(Additional remark 2) The said substance reacts with hexavalent chromium and changes color, The detection body of Additional remark 1 characterized by the above-mentioned.
(Additional remark 3) The said elution part is comprised so that the liquid used for the elution of the hexavalent chromium from the said to-be-detected body can be hold | maintained, The detection body of Additional remark 1 or 2 characterized by the above-mentioned.

(Additional remark 4) The said elution part has a hole which can hold | maintain the said liquid, The detection body of Additional remark 3 characterized by the above-mentioned.
(Additional remark 5) The said elution part is formed using the porous material which can hold | maintain the said liquid, The detection body of Additional remark 3 characterized by the above-mentioned.

(Additional remark 6) The said elution part is formed using the water retention polymer | macromolecule, The detection body of Additional remark 3 characterized by the above-mentioned.
(Additional remark 7) The said elution part is formed using the microcapsule which includes the said liquid, The detection body of Additional remark 3 characterized by the above-mentioned.

(Additional remark 8) The said reaction part is formed using the translucent material, The detection body of Additional remark 1 characterized by the above-mentioned.
(Additional remark 9) The said elution part is formed using the opaque material, The detection body of Additional remark 8 characterized by the above-mentioned.

(Additional remark 10) The said reaction part is comprised with resin containing the said substance, The detection body of Additional remark 1 or 2 characterized by the above-mentioned.
(Additional remark 11) The said reaction part is a microcapsule in which the said substance was included, The detection body of Additional remark 1 or 2 characterized by the above-mentioned.

(Additional remark 12) The surroundings of the said elution part and the said reaction part are sealed leaving the contact surface with the said to-be-detected body of the said elution part, The detection body of Additional remark 1 characterized by the above-mentioned.
(Additional remark 13) The detection body of Additional remark 1 or 2 characterized by having a pH measurement part for measuring pH at the time of eluting hexavalent chromium from the said to-be-detected body.

(Additional remark 14) The detection body of Additional remark 1 or 2 characterized by having 1 or 2 or more other elution parts from which the pH at the time of eluting hexavalent chromium from the said to-be-detected object differs from the said elution part. .
(Additional remark 15) When eluting hexavalent chromium from the said to-be-detected body in the pH measurement part for measuring pH at the time of eluting hexavalent chromium from the to-be-detected body in the said elution part, and the said other elution part The detector according to appendix 14, characterized by comprising: another pH measurement unit for measuring the pH of the sample.

(Additional remark 16) It has the adhesive bond layer adhere | attached on the said to-be-detected body around the said elution part, The detection body of Additional remark 1 characterized by the above-mentioned.
(Additional remark 17) In the detection method of hexavalent chromium,
An elution part for eluting hexavalent chromium from the detected object in contact with the detected object;
A reaction part containing a substance for detecting hexavalent chromium eluted in the elution part;
Using a detector with
A detection method comprising: bringing the elution portion of the detection body into contact with the detection object; and determining the presence or absence of hexavalent chromium in the detection object based on the presence or absence of discoloration in the reaction section.

  (Additional remark 18) The said substance reacts with hexavalent chromium, and discolors, The detection method of Additional remark 17 characterized by the above-mentioned.

It is the schematic of a detection body. It is the schematic at the time of detection body sticking. It is the schematic at the time of hexavalent chromium elution. It is the schematic at the time of reaction part discoloration. It is a figure which shows the 1st structural example of a detection body. It is a figure which shows the 2nd structural example of a detection body. It is a figure which shows the 3rd structural example of a detection body. It is a figure which shows the 4th structural example of a detection body. It is a figure which shows the 5th structural example of a detection body. It is a figure which shows the 6th structural example of a detection body. It is a figure which shows the 7th structural example of a detection body. It is a figure which shows the 8th structural example of a detection body. It is a figure which shows the 9th structural example of a detection body. It is a figure which shows the 10th structural example of a detection body. It is a figure which shows the 11th structural example of a detection body.

Explanation of symbols

1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110 Detector 2, 11, 21, 31, 41, 71, 71a, 71b, 71c, 71d, 71e, 71f, 71g , 71h, 71i, 81 Elution part 3, 51, 72 Reaction part 4 Evaluation object 5 Base layer 6 Hexavalent chromate film 11a Hole 41a, 61 Microcapsule 73 Adhesive layer 74 Translucent film 91 pH measurement part

Claims (5)

In the detector used to detect hexavalent chromium,
An elution part for eluting hexavalent chromium from the detected object in contact with the detected object;
A reaction part containing a substance for detecting hexavalent chromium eluted in the elution part;
A detection body characterized by comprising:   The detector according to claim 1, wherein the substance changes color by reacting with hexavalent chromium.   The detector according to claim 1, wherein the elution part is configured to hold a liquid used for elution of hexavalent chromium from the object to be detected.   The detector according to claim 1, further comprising a pH measuring unit for measuring a pH when the hexavalent chromium is eluted from the object to be detected. The detection body according to claim 1 or 2, wherein the detection body has one or more other elution parts having a pH different from that of the elution part when the hexavalent chromium is eluted from the object to be detected.

Images