Drying holder, method for producing measurement sample, and measurement method

Abstract

To provide a drying holder which enables high-precision measurement by Fourier transform infrared spectroscopy, and to provide a measurement sample preparation method and a measurement method.SOLUTION: A drying holder 101 is provided, comprising a first member 51 including a cylindrically protruding first cylindrical portion 31, and an annular second member 52 configured to allow a filter sheet being pulled flat to be fixed by placing the filter sheet on the first cylindrical portion 31 and fitting the second member 52 from above the filter sheet to surround an outer periphery of the first cylindrical portion 31.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a drying holder, a method for producing a measurement sample, and a measurement method. [Background technology]

[0002] Fourier transform infrared spectroscopy (FTIR) is known as a method for analyzing an object. An example of a Fourier transform infrared spectrophotometer for performing this is described in JP 2021-135204 A (Patent Document 1). The Fourier transform infrared spectrophotometer is equipped with an infrared light source. The infrared light emitted from the infrared light source passes through a predetermined optical system and is then irradiated onto a sample. The infrared light that has passed through the sample is detected by a detector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-135204 Summary of the Invention [Problem to be solved by the invention]

[0004] When the object to be measured is provided in a liquid state, the liquid is impregnated into filter paper, and the measurement is performed using this filter paper as a sample. After the liquid containing the object is impregnated into the filter paper, the filter paper is dried before measurement with a Fourier transform infrared spectrophotometer. However, drying causes wrinkles to form in the filter paper. The surface of wrinkled filter paper is very uneven. Therefore, it is difficult to focus on this surface when measuring with a Fourier transform infrared spectrophotometer. In some cases, measurements must be performed without sufficient focus, resulting in a decrease in the accuracy of the measurement data.

[0005] Therefore, an object of the present invention is to provide a drying holder, a method for producing a measurement sample, and a measurement method that enable highly accurate measurements using Fourier transform infrared spectroscopy. [Means for solving the problem]

[0006] In order to achieve the above object, the drying holder according to the present invention comprises a first member including a first cylindrical portion that protrudes in a cylindrical shape, and an annular second member that can fix the filter paper in a flat, stretched state by fitting around the outside of the first cylindrical portion from above the filter paper when the filter paper is soaked in a liquid containing the target substance and placed on the first cylindrical portion. [Effects of the Invention]

[0007] According to the present invention, the filter paper can be fixed under tension by sandwiching it between the first and second members, and can be dried in this state, thereby creating a sample with a flat surface, which enables highly accurate measurement by Fourier transform infrared spectroscopy. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram of a drying holder in a first embodiment according to the present invention. [Figure 2] FIG. 2 is an explanatory view of a first member provided in the drying holding tool in the first embodiment according to the present invention. [Figure 3] FIG. 3 is an explanatory view of a second member provided in the drying holding tool in the first embodiment according to the present invention. [Figure 4] 1 is a perspective view of a drying holder in a first embodiment according to the present invention. [Figure 5] FIG. 1 is a first explanatory view showing how the drying holder according to the first embodiment of the present invention is used. [Figure 6] FIG. 2 is a second explanatory view of how the drying holder in accordance with the first embodiment of the present invention is used. [Figure 7]1 is a graph showing data obtained by measuring, by Fourier transform infrared spectroscopy, a sample prepared using the drying holder in the first embodiment according to the present invention and a sample prepared without using the drying holder. [Figure 8] 10 is a flowchart of a method for manufacturing a measurement sample in a second embodiment according to the present invention. [Figure 9] 10 is a flowchart of a measurement method in a third embodiment according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment 1) (composition) A drying holder according to a first embodiment of the present invention will be described with reference to Figures 1 to 6. Figure 1 shows a drying holder 101 according to the present embodiment.

[0010] The drying holder 101 includes a first member 51 and a second member 52. A plan view of the first member 51 is shown in FIG. 2. The first member 51 has an opening 6. The first member 51 includes a first tubular portion 31 that protrudes in a tubular shape. The first tubular portion 31 is cylindrical. The first tubular portion 31 has a surface 31a at its upper end. As shown in FIG. 1, the first member 51 includes, in addition to the first tubular portion 31, a second tubular portion 32 that protrudes in the opposite direction from the first tubular portion 31. The second tubular portion 32 has a surface 32a at its lower end. The first member 51 includes an annular protruding portion 4 that protrudes outward from its outer circumferential surface. In the example shown here, the protruding portion 4 has an upper surface 4a and a lower surface 4b. The first member 51 has a vertically symmetrical shape. The opening 6 of the first member 51 may be a through-hole.

[0011] The second member 52 has an upper end 52a and a lower end 52b. In the example shown here, the upper end 52a and the lower end 52b are flat surfaces, but the upper end 52a and the lower end 52b are not limited to flat surfaces. A plan view of the second member 52 is shown in FIG. 3. The second member 52 is annular. The second member 52 has an opening 7. The opening 7 is a through hole.

[0012] A perspective view of the drying holder 101 is shown in FIG. 4. The state in which the drying holder 101 is used is shown in FIGS. 5 and 6. In FIG. 5, the first cylindrical portion 31 Wet filter paper 1 is placed on top of the filter paper 1. The filter paper 1 is soaked in a liquid containing the target object. The target object is, for example, a minute solid. As shown by arrow 91 in Figure 5, the second member 52 is placed over the filter paper 1. By doing so, the first cylindrical portion 31 presses and bends the filter paper 1 and enters the opening 7 of the second member 52. Once the second member 52 has been placed over the filter paper 1, the filter paper 1 reaches the state shown in Figure 6. Figure 6 is a cross-sectional view of the filter paper 1 fixed to the drying holder 101. In this state, the filter paper 1 is in contact with at least the top surface of the first cylindrical portion 31 and the opening to 6 In this case, the surface is pulled toward the outer periphery and is in a flat state.

[0013] In this way, the second member 52 is configured to hold the filter paper 1 soaked in the liquid containing the target substance in the first cylindrical portion. 31 With the filter paper 1 placed on the first cylindrical part, 31 By fitting the filter paper 1 so as to surround the outside of the filter paper 1, the filter paper 1 can be fixed in a flat, stretched state.

[0014] The drying holder 101 is a jig used to dry the filter paper 1 so that it can be used as a sample. After the wet filter paper 1 is fixed as shown in Figure 6, it is dried using an appropriate method. The drying holder 101 with the filter paper 1 fixed thereto may be left to dry naturally, or it may be placed inside a drying chamber for a certain period of time or more. For example, hot air may be blown into the drying holder 101 with the filter paper 1 fixed thereto.

[0015] (Actions and Effects) The drying holder 101 in this embodiment can hold the filter paper 1 in a tensioned state by sandwiching the filter paper 1 between the first member 51 and the second member 52. As a result, the filter paper 1 can be dried in a fixed, flat state. Therefore, this drying holder 101 can create a sample with a flat surface, enabling highly accurate measurement by Fourier transform infrared spectroscopy.

[0016] As shown in this embodiment, the first cylindrical portion 31 is preferably cylindrical. By adopting this configuration, the upper surface of the filter paper 1 can be pulled evenly in all directions. Furthermore, since the first cylindrical portion 31 is cylindrical, it can be used without worrying about the orientation when using the first member 51, which is convenient. In this embodiment, the first cylindrical portion 31 is cylindrical, but this is merely an example, and the first cylindrical portion 31 may be cylindrical with a cross-sectional shape other than a circle.

[0017] As shown in this embodiment, the first member 51 has an annular protruding portion 4 on its outer peripheral surface, and the protruding portion 4 is preferably arranged so that the filter paper 1 can be sandwiched between the lower end 52b of the second member 52 and the upper surface 4a of the protruding portion 4. By adopting this configuration, the filter paper 1 can be sandwiched and firmly fixed. In this embodiment, an example has been shown in which the lower end 52b of the second member 52 is a flat surface, but the same can be said even if the lower end 52b of the second member 52 is not a flat surface.

[0018] In this case, the filter paper 1 soaked in the liquid containing the object is prepared in advance, and the filter paper 1 is placed in the first cylindrical part. 31 With the filter paper 1 placed on the first cylindrical part, 31 In the above description, the second member 52 is fitted so as to surround the outside of the first cylindrical member 52, but this is merely an example. The order of operations is not limited to this. For example, a filter paper 1 that has not yet been soaked with a liquid containing the target substance is prepared, and this is fitted into the first cylindrical member 52. 31 With the filter paper 1 placed on the first cylindrical part, 31 The second member 52 may be fitted so as to surround the outside of the filter paper 1. In this way, the filter paper 1 may be fixed to the drying holder 101 and made flat, and then the liquid containing the target substance may be impregnated into the filter paper 1. Even in this case, the filter paper 1 can be dried while being fixed in a flat state, and a sample with a flat surface can be produced.

[0019] (experiment) The inventors prepared two sets of filter paper 1 soaked in a liquid containing the target substance. One was dried using the drying holder 101 of the present embodiment to create a sample, and the other was dried using a conventional method without using this holder. Using these two sets of samples, measurements were performed using Fourier transform infrared spectroscopy, and the obtained data were compared. The measurement data obtained from these two sets of samples are shown in FIG. 7. FIG. 7 displays absorbance graphs for Data A and B. Data A is from a sample obtained using the drying holder 101. Data B is from a sample obtained by drying using the conventional method. Data A has sufficient absorbance intensity, making the peak easy to identify. On the other hand, Data B has reduced absorbance intensity, making the peaks less clear.

[0020] As described above, it was confirmed that drying using the drying holder 101 of this embodiment enables highly accurate measurement by Fourier transform infrared spectroscopy.

[0021] (Embodiment 2) (Measuring sample manufacturing method) Referring to FIG. 8, a method for manufacturing a measurement sample according to a second embodiment of the present invention will be described. A flowchart of the method for manufacturing a measurement sample according to this embodiment is shown in FIG. 8. The method for manufacturing a measurement sample according to this embodiment includes the steps of fixing filter paper to a drying holder (S1), soaking the filter paper in a liquid containing the target substance (S2), and drying the filter paper while it is held in the drying holder (S3). The "drying holder" here includes a first member including a first cylindrical portion that protrudes in a cylindrical shape, and an annular second member that, when the filter paper is placed on the first cylindrical portion, fits around the outside of the first cylindrical portion from above the filter paper, thereby fixing the filter paper in a flat, stretched state. In other words, the "drying holder" here may be, for example, the drying holder 101 described in the first embodiment.

[0022] (Actions and Effects) According to the method for producing a measurement sample in this embodiment, it is possible to dry a filter paper soaked in a liquid containing a target substance while applying tension to keep it flat, thereby obtaining a sample with a flat surface, which enables highly accurate measurement by Fourier transform infrared spectroscopy.

[0023] (Embodiment 3) (Measurement method) A measurement method according to a third embodiment of the present invention will be described with reference to FIG. 9. A flowchart of the measurement method according to this embodiment is shown in FIG. The measurement method according to this embodiment includes the steps of: (i) fixing filter paper to a drying holder (S1); (ii) soaking the filter paper in a liquid containing the target substance (S2); (iii) drying the filter paper while it is held in the drying holder (S3); and (iv) performing Fourier transform infrared spectroscopy analysis by irradiating the filter paper with infrared light while it is held in the drying holder (S4). The "drying holder" here includes a first member including a cylindrically protruding first cylindrical portion; and a ring-shaped second member that, when the filter paper is placed on the first cylindrical portion, fits around the outside of the first cylindrical portion from above, thereby fixing the filter paper in a flat, stretched state. That is, the "drying holder" here may be, for example, the drying holder 101 described in the first embodiment.

[0024] (Actions and Effects) According to the measurement method of this embodiment, the filter paper soaked in the liquid containing the target substance is fixed in a flat state and dried before being analyzed by Fourier transform infrared spectroscopy, which enables highly accurate measurement. Therefore, highly accurate measurement by Fourier transform infrared spectroscopy is possible.

[0025] As described above, a sample can be produced not only by fixing the filter paper 1 to the drying holder 101 and drying it, but also by irradiating the filter paper 1 with infrared light while it is still fixed to the drying holder 101, thereby performing analysis by Fourier transform infrared spectroscopy. This method can eliminate the need to transfer the sample to another holder. This method is also preferable because it can more reliably maintain the sample in a flat state.

[0026] In the first embodiment, an example in which the drying holder 101 includes the second cylindrical portion 32 has been described, but the drying holder may not include the second cylindrical portion 32. In the first embodiment, an example in which the first cylindrical portion 31 and the second cylindrical portion 32 have the same shape has been described, but they may be the same or different. The dimensional ratios of the drying holder shown in Figs. 1 to 6 are merely examples and are not limited to these. The drying holder may not include the protruding portion 4, for example.

[0027] It should be noted that a plurality of the above-described embodiments may be appropriately combined and adopted.

[0028] The above-described embodiments disclosed herein are illustrative in all respects and are not limiting. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0029] 1 filter paper, 4 extension portion, 4a upper surface (of extension portion), 4b lower surface (of extension portion), 6 opening (of first member), 7 opening (of second member), 31 first cylindrical portion, 31a surface, 32 second cylindrical portion, 32a surface, 51 first member, 52 second member, 52a upper end, 52b lower end, 101 drying holder.

Claims

1. a first member including a first cylindrical portion that protrudes in a cylindrical shape; a second annular member that can fix the filter paper in a flat, stretched state by fitting the second annular member around the outside of the first cylindrical portion from above the filter paper when the filter paper is placed on the first cylindrical portion, The drying holder comprises a second cylindrical portion that projects in a direction opposite to the first cylindrical portion, and the first cylindrical portion and the second cylindrical portion have the same shape.

2. The drying holder according to claim 1 , wherein the first tubular portion is cylindrical.

3. 3. The drying holder according to claim 1, wherein the first member has an annular protrusion on its outer peripheral surface, and the protrusion is positioned so that the filter paper can be sandwiched between a lower end of the second member and an upper surface of the protrusion.

4. A step of fixing the filter paper to a drying holder; A step of soaking the filter paper with a liquid containing the target substance; and drying the filter paper while it is held by the drying holder, The drying holder includes a first member including a first cylindrical portion that protrudes in a cylindrical shape, and an annular second member that, with the filter paper placed on the first cylindrical portion, fits into the first cylindrical portion so as to surround the outside of the first cylindrical portion from above the filter paper, thereby fixing the filter paper in a flat, stretched state; A method for manufacturing a measurement sample, wherein the drying holder has a second cylindrical portion that protrudes in the opposite direction to the first cylindrical portion, and the first cylindrical portion and the second cylindrical portion have the same shape.

5. A step of fixing the filter paper to a drying holder; A step of soaking the filter paper with a liquid containing the target substance; drying the filter paper while it is held by the drying holder; and after the drying step, performing an analysis by Fourier transform infrared spectroscopy by irradiating the filter paper with infrared light while the filter paper is held by the drying holder, The drying holder includes a first member including a first cylindrical portion that protrudes in a cylindrical shape, and an annular second member that, with the filter paper placed on the first cylindrical portion, fits into the first cylindrical portion so as to surround the outside of the first cylindrical portion from above the filter paper, thereby fixing the filter paper in a flat, stretched state; The drying holder includes a second cylindrical portion that protrudes in a direction opposite to the first cylindrical portion, and the first cylindrical portion and the second cylindrical portion have the same shape.

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