JPH0531742B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a semi-quantitative device for chemical component-containing solutions, and more specifically, it relates to a semi-quantitative device for chemical component-containing solutions, and more specifically, it relates to a semi-quantitative device for chemical component-containing solutions. The present invention relates to a device for semi-quantifying the content of iron ions contained in a chemical component-containing solution by comparing the content with a color standard.

[Prior art]

Analysis of specific chemical components in aqueous solutions is an unavoidable operation for managing aqueous solutions.
However, many chemical analyzes require special equipment and complicated procedures. For this reason, there has been a desire to develop a quick and simple analytical method that can be used at any location where analysis is required and that does not require a chemical expert.

Various simple analysis kits are known to meet these demands. Among these simple analysis kits, those that utilize coloration or decolorization reactions use color standards prepared in advance to correspond to the amounts of chemical components, instead of the spectrophotometer normally used for this type of analysis. A semi-quantitative method is used compared to

For example, with the Ponal Kit manufactured by Dojindo Laboratories, after collecting a certain amount of sample water in a test tube, one tablet as a coloring reagent is added, and the color density is determined.
Semi-quantification is performed by comparing resins containing various concentrations of pigments molded into cylindrical shapes with a color standard stacked up in a mosaic pattern. In addition to this example,
The technique described in JP-A-58-66848, ``Method for determining the amount of alkaline substances in fats and oils and assay device,'' also semi-quantitates the amount by comparing it with a known standard color sample.

However, although this method is effective when the sample water is nearly colorless and transparent, when the sample water is colored before the addition of the coloring reagent, comparative quantification becomes extremely difficult. In other words, if the sample water itself is colored, it is necessary to take that coloring into consideration and compare it with the color standard, but it is necessary to subtract the coloration of the sample water itself and compare it with the color standard, which causes subtle color changes. It is often impossible even for experts to make judgments by comparing with color standards.

For this reason, it is possible to prepare a color standard that takes into account the coloring of the sample water itself, but it is also necessary to prepare a white standard that takes into account not only the difference in hue of the coloring, but also the saturation and lightness. This is difficult to implement in practice because the number of types is enormous.

In this regard, Japanese Patent Application Laid-Open No. 52-56995 discloses a technology that performs color compensation between water test and discolored water using a color table or color disk movably placed under the water test container. Disclosed.

However, with this technique, it is necessary to pull or rotate the color table or color disk while looking at the sampled water or discolored sample from above, and in the case of color comparison, it is necessary to compare the colors before and after the approximation. Since they cannot be seen at the same time, it is difficult to judge when the colors are similar, and there have even been cases of misdiagnosis, especially when quantifying iron ion concentration.

[Purpose of the invention]

The purpose of the present invention is to determine the iron ion content by comparing with a color standard, even if the test water (subject) itself is colored, regardless of its hue, saturation, brightness, etc. The purpose of the present invention is to reveal a semi-quantitative device for iron ions in solutions containing chemical components, which can be used to semi-quantitate iron ions in solutions containing chemical components, and which can be carried out easily and quickly at any location, even by non-experts. .

Other objects of the invention will become apparent from the following description of the specification.

[Summary of the invention]

As a result of intensive research, the inventor of the present invention mixed a chemical component-containing solution with a reagent that quantitatively changes color by reacting with the chemical component, and compared it with a color standard to determine the chemical component content of the chemical component-containing solution. In the semi-quantitative device for chemical component-containing solutions, the semi-quantitative device is configured to use, as a standard, a color standard obtained by superimposing a chemical component-containing solution that is not mixed with the reagent on the color standard. A rear plate made of a milky white plate capable of scattering light is installed on the back of the container stand on which the discolored water test container is placed. It has been found that the above object can be achieved by a device for semi-quantitative determination of iron ion concentration in a solution containing chemical components, which is characterized in that a color standard table indicating iron ion concentration is arranged vertically, and the present invention has been achieved.

[Structure of the invention]

The present invention will be described in further detail below.

The method of the present invention can be applied to semi-quantitative determination of all chemical component-containing solutions using a quantitative color change reaction (for example, color development or decolorization reaction) of iron ions.

In the present invention, the chemical component-containing solution without mixing reagents (referred to as test water in this specification) that is used by superimposing it on the color standard is basically an aqueous solution that is not subjected to pretreatment. Not limited to. Specifically, it is preferable to use the solution immediately before adding the reagents necessary to cause quantitative discoloration, and also to prepare the solution immediately before adding the reagents necessary to cause quantitative discoloration of iron ions.
If treatments such as adjustment, pre-oxidation or pre-reduction are required, the liquid is preferably subjected to such treatments.

In the present invention, the color standard on which the test water is superimposed (herein referred to as a color standard table) refers to the color obtained by reacting with a reagent that reacts with iron ions to quantitatively change color. This is a color standard table prepared in advance as a table in which the concentration corresponds to the concentration of the iron ion. Various color standard tables have been known in the past, and these known color standard tables can be employed in the present invention, but the color standard table in the present invention has translucency. That is, the color density in the total transmitted light of the transmitted light of the color standard table and the transmitted light of the sample water can be compared and observed. The direction of the transmitted light may be from the color standard front side to the water test side.

The color standard table particularly effectively used in the present invention is a plate-shaped molded product containing a pigment. Such a color standard table may be a polymer resin or glass molded into a flat plate containing pigments of various concentrations, or a flat resin or glass plate containing pigments dissolved in a solvent may be used. It may be sprayed or applied. Alternatively, a film containing a dye such as cellophane, a hydrophilic binder containing a dye (gelatin, etc.), or a film coated with a hydrophilic binder containing a dye (gelatin, etc.) may be placed on a glass or polymer resin plate. It may be attached or inserted between them. In the case where the color standard table is inserted between two members as described above, it is preferable that the member on the side of the color standard table that is overlapped with the sample water is transparent. The member on the opposite side is processed to have a milky white color that allows light to pass through. This makes the light source less visible and easier to compare. The term milky white includes cases where light can be scattered by a rough surface such as ground glass.

In addition, in the case where a color standard table is inserted between two members as described above, if the member on the side that overlaps the sample water is colored, a color standard table that takes into account the coloring may be prepared.

The color standard table of the present invention does not need to be placed between two members as described above, but may be attached to a milky white plate that is capable of scattering light, for example.
Further, together with such a milky white plate, it may be attached to an arbitrary support member in a replaceable manner such as a sliding type.

In the present invention, the transmitted light that passes through the color standard table and test water, and the transmitted light that passes through a chemical component-containing solution that has been mixed with a reagent to exhibit discoloration (herein referred to as discolored test water) are: The conditions leading to the visual perception of an outside observer, especially the light transmission conditions (container thickness, width, shape, etc.) and the conditions causing coloration, need to be the same. That is, the condition for causing coloring must not be such that a coloring component is present only in the middle of the path of one of the passing lights. However, this does not apply if the color standard table is created taking into account the presence of the coloring component. This also applies to containers for water samples and discolored samples.

The containers containing the test water and the discolored test water have the same conditions for causing coloration with respect to transmitted light, and are particularly preferably made of colorless and transparent glass or polymer resin. Here, the colorless and transparent container is one made of glass or polymer resin, and its shape does not matter. For example, when a cylindrical container such as a test tube is placed over a flat color standard table, the lens effect creates an effect that makes it appear as though the liquid is actually colored to the color shown in the color standard table. This is preferable because it can be used in combination with a flat color standard table even if the container is in the form of a square cell, and a good unique color standard can be obtained.

In the color change test water according to the present invention, a reagent that quantitatively changes color by reacting with iron ions in the test water (hereinafter referred to as a coloring reagent) is added to the test water, mixed, and the color change reaction is completed. It can be obtained by letting The color change reaction time varies depending on the concentration of iron ions, the type and concentration of the coloring reagent, and reaction conditions such as temperature and stirring.

The coloring reagent used in the present invention may be any conventionally known coloring reagent.

The semi-quantitative determination device of the present invention uses visual judgment. Visual observation may be performed by directly comparing the color density of the transmitted light of the water test and color standard table with the transmitted light of the discolored test water, or by comparing the color density projected onto a projection surface such as ground glass. An indirect method of comparatively observing the concentration may also be used.

An example of the apparatus according to the present invention is shown in FIG. 1, and this specific example will now be described.

In the figure, 1 is a rear plate made of a milky-white acrylic plate that can scatter light, 2 is a front plate made of a colorless and transparent acrylic plate, and 3 is a color standard table arranged vertically, which is a colorless and transparent cellulose acetate plate. Colorants of various concentrations (e.g. food red) are applied to the film base.
According to No. 102, etc. ), and the iron ion concentration in the sample water is 0, 0.5, and 0.5, respectively.
Colored layers having concentrations corresponding to 1, 2, 3, 4, and 5 ppm are sequentially arranged and sandwiched between the front and rear plates. 4 is a water test container, and 5 is a discolored water test container, each of which can be placed upright on a container stand 6. At this time, the water test container 4 is
It is placed so that it is located in front of the Further, the discolored water test container 5 is arranged so as not to overlap the color standard table 3.

To carry out semi-quantitative determination of iron ions using this device, a light source (preferably white light) is placed behind the rear plate 1, and the light source is It is only necessary to receive each transmitted light from the two transmitting lights, compare their coloring densities, and visually determine the iron ion concentration (ppm) at which the coloring densities of both transmitted lights are equivalent.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the embodiments of the present invention are not limited thereto.

Wastewater was collected from three chemical factories A, B, and C. A was pale yellow, B was reddish-purple, and C was pale green. After adding 10 mg of sodium L-ascorbate to about 10 ml of each of these three types of waste liquid, each type was poured into two test tubes up to the mouth. To the former, add 2 g of benzyl alcohol, 3 g of ethylene glycol, α,
Add 2 drops (approximately 0.08 ml) of a coloring reagent (liquid) consisting of 0.03 g of α'-dipyridyl with a dropper, stopper it with your finger, and shake for approximately 2 seconds to develop the color, as shown in Figure 1. The latter was inserted into the right side of the container stand 6 of a color standard device, and the latter was inserted into the left side of the container stand 6 without any treatment for comparison, and the iron ion concentration was determined. The results are shown in Table 1 together with the analysis values by atomic absorption.

Table 1 Reagent Analytical Value Analytical value by atomic absorption spectrometry (chemical factory wastewater) (ppm) (ppm) A 4 3.8 B 2 2.1 C 5 4.5 As is clear from Table 1, the analysis before adding the coloring reagent Since the liquid is colored, it was not possible to quantify it using the conventional method of directly comparing it with a color standard, but it can be seen that the analytical method of the present invention makes it possible to accurately quantify the iron ion concentration.

[Brief explanation of the drawing]

FIG. 1 shows a color standard device showing one embodiment of the present invention, which has a structure that also serves as a container (test tube) holder. In the figure, 1 indicates a rear plate, 2 indicates a front plate, 3 indicates a color standard table, 4 indicates a water test container, 5 indicates a discolored water test container, and 6 indicates a container stand.

Claims (1)

[Claims] 1. A device that mixes a chemical component-containing solution with a reagent that quantitatively changes color by reacting with a chemical component, and semi-quantifies the chemical component content of the chemical component-containing solution by comparing it with a color standard. In a semi-quantitative device for a chemical component-containing solution, which uses a color standard obtained by superimposing an unmixed chemical component-containing solution on the color standard as a standard, a container stand is used in which a water test container and a discoloration test container are placed upright. A rear plate made of a milky white plate capable of scattering light is installed on the back, and a color standard table indicating the iron ion concentration in the test water is displayed vertically along the back of the water test container in front of the rear plate. A semi-quantitative device for determining iron ion concentration in a chemical component-containing solution, characterized in that the device is placed in a chemical component-containing solution.