JP2009058440A - Gap water extractor of rock by dilution/dispersion system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gap water extractor of a rock by a dilution/dispersion system capable of accelerating the extraction of the gap water from the rock to efficiently extract the gap water. <P>SOLUTION: The gap water extractor of the rock by the dilution/dispersion system includes a housing container 10 for storing ultrapure water 22 in which the rock 21 is immersed, stirrers 12 and 13 for stirring the ultrapure water 22 stored in the housing container 10 and a syring 18 for sampling the ultrapure water 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for extracting pore water from a rock by a dilution / dispersion method, and is particularly suitable for use in investigating the composition of pore water in rock.

  In recent years, research on underground facilities using sedimentary rocks in the deep underground has been conducted. In particular, sedimentary rocks have few cracks, and have excellent natural barrier properties such as shielding and self-sealing function as the host rock for geological disposal of radioactive waste, so it is intended to be applied to investigation of radioactive waste disposal facilities in deep underground Research is being carried out in each country.

  However, sedimentary rocks have a high porosity and contain a large amount of pore water. Therefore, it is necessary to construct a three-dimensional hydrogeological structure model of the ground in order to accurately grasp the movement of water in the ground. There is. In order to build a detailed hydrogeological model of sedimentary rock ground, it is necessary to accurately evaluate the geology, hydraulic and geochemical characteristics of the target ground. Of these, for geochemical characteristics, it is important to accurately understand the quality of groundwater by collecting and analyzing groundwater existing in the target ground in situ.

  For example, in borehole excavation conducted to learn the composition of groundwater from deep sedimentary rocks, groundwater is contaminated by mud, making it difficult to collect in situ groundwater. In addition, when there are many highly permeable layers in the ground, groundwater flows upward and downward in the hole due to the difference in pore water pressure for each layer, making it difficult to collect the groundwater in the initial state. On the other hand, when the ground has low water permeability, it is difficult to collect groundwater with the ability of the in-situ water sampling device or it takes a long time. Furthermore, in order to collect in-situ groundwater at a specific depth, a special water sampling device such as a packer system is required, which increases the cost and limits the water sampling depth.

  On the other hand, the groundwater of sedimentary rock soft rock is mainly located in the gap between rocks, and when the ground is low-permeability, the pore water extracted from the gap of the rock core may reflect the composition of in situ groundwater. In many cases, it can be positioned as a complementary means for groundwater quality surveys.

  Examples of techniques for extracting pore water from sedimentary rocks include a centrifugal separation method and a consolidation method.

  However, in any extraction method, the extracted water remains in the gap, so the amount of pore water collected is small, and a large amount of rock may have to be processed for analysis that requires several cc of water. The operation becomes complicated and the number of samples increases, so that the sampling points become wide and the composition of the pore water collected is varied.

  In addition, when forming a rock into a shape suitable for extraction of pore water, the rock's pore water evaporates, so it is necessary to form the rock in as short a time as possible. For this reason, as an apparatus for extracting pore water in rocks, an apparatus that does not require rock formation or that can be simply formed is desired.

Kikata Construction, Takahiro Oyama, Yasunori Mahara: Production of compacted rock extraction device and application to deep sedimentary rocks, Applied Geology, Vol. 40, No. 5, 260-269, 1999

  The present invention has been made in view of the above situation, and provides a rock pore water extraction apparatus using a dilution / dispersion system that can facilitate the extraction of pore water from rocks and efficiently extract pore water. For the purpose.

  In order to achieve the above object, a rock pore water extraction apparatus according to the present invention according to claim 1 according to the present invention comprises a storage container that mixes and stores together a fluid for diluting pore water of a rock and the rock. And stirring means for stirring the fluid to promote dispersion of pore water contained in the rock into the fluid.

  In the present invention according to claim 1, when the rock is stored in the storage container and the rock is immersed in the fluid, various components contained in the pore water of the rock are extracted into the fluid. As a result, the fluid in the storage container is diluted with pore water. Thereby, when analyzing pore water, there is no need to dilute the fluid again with water or the like, and the pore water can be analyzed efficiently. Further, since the dispersion of elements from the rock pore water to the diluted solution is promoted by the stirring means, the pore water can be analyzed more efficiently.

  According to a second aspect of the present invention, there is provided a rock pore water extraction device using the dilution / dispersion method according to the present invention, wherein the rock pore water extraction device using the dilution / dispersion method according to the first aspect comprises a sampling means for collecting the fluid. It is characterized by having.

  In the present invention according to claim 2, the rock water in the rock can be collected by the collecting means while the rock is stored in the storage container. Thereby, the water quality change of the pore water diluted with the fluid can be continuously observed.

  According to a third aspect of the present invention, there is provided the rock pore water extraction device by the dilution / dispersion method according to the present invention, wherein the stirring means is the rock pore water extraction device by the dilution / dispersion method according to the first or second aspect. The magnetic stirrer includes a stirrer disposed in the storage container, and the storage container includes a support base including a base portion on which the rock is placed and a leg portion that supports the base portion. The pedestal portion of the support stand is provided with a through hole having a diameter smaller than the diameter of the rock.

  In this invention which concerns on Claim 3, since a rock is accommodated in a storage container via a support stand, rotation of a stirrer is not inhibited by a rock.

  Further, the rock pore water collecting method according to claim 4 of the present invention is a rock pore water collecting method using the rock pore water extraction device according to claim 2 or claim 3 by the dilution / dispersion method. A step of immersing rock in a fluid and stirring the fluid by the stirring means; a step of stopping the stirring means; and a step of extracting pore water of the rock from the storage container by the sampling means. It is characterized by that.

  In the present invention according to claim 4, the rock pore water is extracted into the fluid by immersing the rock in the fluid, and the extraction is promoted by stirring with the stirring means. Moreover, the suspension of the rock in a liquid sinks under a storage container by stopping a stirring means. Thereafter, the fluid in the storage container is taken out by the collecting means. The composition of the extracted fluid is obtained by analyzing the extracted fluid.

  The rock pore water extraction apparatus and the rock pore water extraction method according to the present invention using a dilution / dispersion method can extract rock pore water and efficiently analyze it.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a rock pore water extraction device using a dilution / dispersion method according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a mode of using a rock pore water extraction device using a dilution / dispersion method, and FIG. Shows the manner in which pore water in the rock is extracted. The illustrated embodiment is an exemplification, and the present invention is not limited to the following description.

  Based on FIG. 1, the whole structure of the rock pore water extraction apparatus by a dilution / dispersion system is demonstrated.

  As shown in FIG. 1, the rock pore water extraction apparatus according to the present embodiment using a dilution / dispersion system includes a storage container 10. The storage container 10 is a cylindrical container formed in a shape capable of storing the stirring bar 12 and the support base 14 therein. A lid 11 that closes the opening of the storage container 10 is detachably attached to the storage container 10, and an annular rubber ring 26 is fitted to the side surface of the lid 11. The rubber ring 26 fills a gap between the side surface of the lid 11 and the inner surface of the storage container 10. Further, the lid 11 slides along the inner surface of the storage container 10 via the rubber ring 26. That is, the lid 11 is movable up and down while closing the opening of the storage container 10. The storage container 10 and the lid 11 can be suitably formed of a corrosion-resistant alloy, for example, Hastelloy (registered trademark) whose main component is nickel.

  The stirrer 12 constitutes a stirring means together with the stirrer 13. In this embodiment, a so-called magnetic stirrer is used. The stirrer 12 is a flat plate member formed in a cross shape in plan view, and is disposed at the bottom of the storage container 10.

  The stirrer 13 has the storage container 10 mounted on the upper surface thereof, and rotates the stirrer 12 disposed in the storage container 10 by a magnetic force. Specifically, the stirrer 13 is provided with a rod-shaped magnet (not shown), and this magnet is rotated in a horizontal plane by a driving motor (not shown). When the drive motor rotates, the magnet of the stirrer 13 also rotates, so that the stirrer 12 in the storage container 10 rotates in accordance with the rotation of the magnet of the stirrer 13.

  The support base 14 includes a pedestal portion 15 and a plurality of leg portions 16 (four in this embodiment). The pedestal portion 15 is a flat plate member, and rocks are placed on the upper surface of the pedestal portion 15. The pedestal 15 is provided with a plurality of through-holes 17 that penetrate in the thickness direction. The diameter of the through hole 17 is smaller than the diameter of the rock placed on the pedestal portion 15. Moreover, the leg part 16 is attached to the lower surface of the base part 15, and the front-end | tip is extended toward the downward direction.

  Note that the leg 16 of the support base 14 is secured below the pedestal 15 so that when the support base 14 is disposed in the storage container 10, a space that does not hinder the rotation of the stirrer 12 is secured. Is formed.

  The interstitial water extraction apparatus of this embodiment is provided with a syringe 18 that is an example of a collecting means. Further, the lid 11 is provided with a water intake port 19 penetrating in the thickness direction, and the syringe 18 communicates with the inside of the storage container 10 through the water intake port 19.

  Based on FIG. 2, the mode at the time of use of the rock pore water extraction apparatus by a dilution and dispersion system is demonstrated.

  As shown in FIG. 2, the storage container 10 is placed on the upper surface of the stirrer 13. A stirrer 12 is disposed at the bottom of the storage container 10, and a support base 14 is disposed so as to cover the stirrer 12. Furthermore, a rock 21 is placed on the pedestal 15 of the support base 14.

  Here, ultrapure water 22, which is an example of a fluid whose weight has been measured in advance, is poured into the storage container 10, and the rock 21 is crushed. The opening of the storage container 10 is closed with the lid 11, and the air accumulated in the upper part of the storage container 10 is exhausted from the syringe 18 through the water inlet 19. At this time, when the ultrapure water 22 is discharged into the syringe 18 together with the air accumulated in the storage container 10, the weight of the ultrapure water 22 discharged from the total weight of the syringe air body and the syringe is measured. So this is discarded.

  When the stirrer 12 is rotated by the rotation of the drive motor of the stirrer 13, the ultrapure water 22 is stirred. The through hole 17 of the support base 14 becomes a passage for the ultrapure water 22 stirred by the stirrer 12, and is provided for smooth stirring of the ultrapure water 22.

  By the stirring, the pore water contained in the rock 21 flows out of the rock 21 and is mixed with the ultrapure water 22, and the ultrapure water 22 gradually dilutes the pore water. Hereinafter, pore water diluted with ultrapure water 22 is referred to as diluted pore water.

  When collecting the diluted pore water (ultra pure water 22) in the storage container 10, the stirrer 13 is stopped to stop stirring, and the suspension of the rock 21 is allowed to settle below the storage container 10 and then stored. This is done by moving the lid 11 that closes the container 10 downward. Due to the movement of the lid 11, the diluted pore water (ultra pure water 22) is pressed by the lid 11 and pushed out by the syringe 18. In this manner, the syringe 18 can collect diluted pore water without contact with the atmosphere.

  The composition of this diluted pore water is calculated by calculating the amount of pore water contained in the rock used for extraction from the water content ratio of the rock obtained separately, and calculating the mixing ratio with ultrapure water that dilutes the pore water. The mixing ratio is obtained by multiplying the extracted analysis value of the diluted pore water.

  The composition (X) of this diluted pore water calculates the amount (g) (A) of pore water contained in the rock used for extraction from the water content ratio of the rock obtained separately, and dilutes the pore water (B). Calculated by calculating the mixing ratio (D) with ultrapure water (g) and (C) and multiplying this mixing ratio (D) by the analysis value (E) of the diluted pore water (see Equation 1 below) .

  In the rock pore water extraction apparatus using the dilution / dispersion system configured as described above, the rock 21 is immersed in the ultrapure water 22, so that components dissolved in the pore water from the pore water contained in the rock 21 are outside the rock 21. And mixed with ultrapure water 22. That is, the ultrapure water 22 is obtained by diluting pore water. And since the ultrapure water 22 in which the pore water component is dissolved can be collected in the syringe 18, the pore water in the rock 21 can be analyzed.

  Further, when the stirrer 13 is operated, the ultrapure water 22 in the storage container 10 is agitated by the rotation of the stirrer 12, so that the pore water in the rock 21 can be extracted in a short time.

  Based on FIG. 3, it demonstrates in detail that extraction of the pore water of the rock 21 can be performed in a short time.

  As shown in FIG. 3, pore water 23 such as ground water exists in the gap between the rocks 21. Sodium (Na), which is an example of a component of pore water, is dissolved in the pore water. On the other hand, the storage container 10 (see FIGS. 1 and 2) stores ultrapure water 22 in which the presence of ions cannot be detected by a method of analyzing diluted pore water (ion chromatography or ICP analysis). Since the concentration of sodium ions is different between the pore water 23 and the ultrapure water 22, sodium ions move to the ultrapure water 22 due to the gradient of this concentration.

  Here, if stirring of the ultrapure water 22 by the stirrer 12 is not performed, the concentration of sodium ions in the ultrapure water 22 increases in the vicinity of the rock 21. Accordingly, the concentration gradient of sodium ions becomes small, so that sodium ions are difficult to extract into the ultrapure water 22. Of course, the concentration of sodium ions in the ultrapure water 22 is gradually homogenized, but it takes time.

  On the other hand, when the ultrapure water 22 is stirred by the stirrer 12, the concentration of sodium ions in the ultrapure water 22 is homogenized, so that the gradient of sodium ion concentration in the vicinity of the rock 21 is not reduced. Extraction of sodium ions in the pore water 23 of the rock 21 can be performed in a short time.

  As described above, in the rock pore water extraction apparatus according to the present embodiment using the dilution / dispersion method, various components such as sodium ions are extracted from the pore water 23 of the rock 21 into the ultrapure water 22 and diluted with the syringe 18. Can be collected as water. As a result, the water quality of the pore water 23 of the rock 21 can be analyzed. Further, by using the stirrer 12 and the stirrer 13, the pore water 23 can be extracted in a short time.

  Moreover, since various components such as ionic sodium extracted from the rock 21 are dissolved in the ultrapure water 22, the pore water 23 of the rock 21 is diluted with the ultrapure water 22. Therefore, in the prior art, when extracting the pore water and analyzing the pore water, it was necessary to dilute the pore water with water. It is possible to analyze pore water.

  In addition, as shown in FIG. 2, the rock 21 only needs to be accommodated in the storage container 10, and complicated work is not required for the formation of the rock 21, so that the pore water evaporates as much as possible when the rock 21 is formed. Can be suppressed.

  Furthermore, since the water that is still sealed in the storage container 10 can be collected by the syringe 18, changes in the water quality of the ultrapure water 22 can be continuously observed.

  In addition, as the storage container 10, it is not limited to what was shown by this embodiment. For example, a syringe may be used. Since the volume of the syringe is variable, it is possible to provide a storage container having a volume that matches the size of the sample.

  INDUSTRIAL APPLICABILITY The present invention can be used in the industrial field in which pore water contained in rocks is collected and verified.

1 is an exploded perspective view of a rock pore water extraction apparatus using a dilution / dispersion method according to an embodiment of the present invention. It is a figure which shows the aspect at the time of use of the rock pore water extraction apparatus by a dilution and dispersion system. It is a conceptual diagram which shows the aspect from which the pore water of a rock is extracted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Storage container 11 Cover 12 Stirrer 13 Stirrer 14 Support stand 15 Base part 16 Leg part 17 Through-hole 18 Syringe 19 Water intake 21 Rock 22 Ultrapure water 23 Pore water 26 Rubber ring

Claims (4)

A storage container for mixing and storing a fluid for diluting pore water in the rock and the rock;
An apparatus for extracting pore water from a rock by a dilution / dispersion system, comprising stirring means for stirring the fluid to promote dispersion of pore water contained in the rock into the fluid. In the rock pore water extraction device by the dilution / dispersion method according to claim 1,
An apparatus for extracting pore water from a rock by a dilution / dispersion system, comprising a collecting means for collecting the fluid. In the rock pore water extraction device by the dilution / dispersion method according to claim 1 or 2,
The stirring means is a magnetic stirrer provided with a stirring bar disposed in the storage container,
In the storage container, a support base composed of a pedestal part on which the rock is placed and a leg part that supports the pedestal part is erected,
An apparatus for extracting pore water from a rock by a dilution / dispersion system, wherein a through hole having a diameter smaller than the diameter of the rock is provided in a pedestal portion of the support base. A method for collecting rock pore water using the rock pore water extraction device according to the dilution / dispersion method according to claim 2 or claim 3,
Immersing rock in the fluid and stirring the fluid by the stirring means;
Stopping the stirring means;
A step of extracting rock pore water from the storage container by the collecting means.

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