KR20060040275A - Sampling device and method of collecting sample using the same - Google Patents

Abstract

Sampling equipment includes a sampling part and a fixing part. The sampling unit accommodates a sampling solvent and the sampling solvent and the transmittance of the sampling solvent is less than that of the contaminants. The fixing unit surrounds and fixes the sample collection unit. Therefore, contamination at the time of sampling is prevented and cost is reduced.

Description

Sampling device and method of collecting sample using the same

1 is a plan view showing a sampling device according to a first embodiment of the present invention.

Figure 2 is an exploded view showing the sampling device shown in FIG.

3 is a plan view showing a sample collection unit according to a second embodiment of the present invention.

4 is a plan view showing a sample collection unit according to a third embodiment of the present invention.

5 is a graph showing concentrations of a solvent and a contaminant layer before sampling.

6 is a graph showing concentrations of a solvent and a contaminant layer after sampling.

7 is a cross-sectional view of the sampler installed in the observation well according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: storage container 11: collecting solvent

12: upper suture 13: lower suture

20: protection net 30: counterweight

40: connecting line 50: observation

60: groundwater level 70: aquifer

100: sampling part 200: fixing part

The present invention relates to a sampling device and a sampling method using the same, and more particularly, to a sampling device and a sampling method using the same to prevent contamination and reduce costs.

Groundwater pollution surveys and soil pollution surveys are actively conducted due to the social interest in environmental conservation and the strengthening of groundwater and soil environmental conservation laws. In particular, BTEX pollution on sites containing oil reservoirs such as gas stations, and TCE and PCE contamination in groundwater centered on industrial complexes and urban centers are emerging as major issues. These BTEX, TCE, PCE, etc. are volatile organic compounds (VOCs). In the groundwater contamination investigation, the measured value may vary according to the groundwater sampling method, and substances with a higher specific gravity than water, such as TCE and PCE, may show the difference in pollution concentration according to the depth. Sampling techniques are needed.

In groundwater contamination surveys, groundwater observation wells are usually installed in the area of potential pollution and groundwater samples are collected and analyzed to determine whether they are contaminated. Conventional groundwater harvesting techniques can be classified into three categories.

One method is to take a sample when it stabilizes by measuring values of pH, water temperature, electrical conductivity (EC), dissolved oxygen (DO), etc. while pumping a certain amount of groundwater using a pump or submersible pump. to be.

The second method is to minimize groundwater disturbance and aeration by extracting groundwater at low speed as possible when pumping groundwater.

Finally, there is a method of extracting a certain amount of groundwater by hanging a container to catch groundwater such as a baler.

Although these techniques are commonly used methods, it is difficult to precisely measure the contamination due to disturbance of the groundwater system during groundwater sampling.

In addition, when the groundwater is extracted for sampling the groundwater, the ground surface is contaminated in the process of disposal with the groundwater extracted by the pollutants contained in the groundwater. In order to separate the groundwater extracted to prevent the contamination, additional costs are required.

Moreover, equipment such as disposable balers, peristaltic pumps, and submersible pumps for extracting groundwater are difficult to move due to their size and weight. In addition, the conventional equipment requires many auxiliary equipment such as pumps, electric and electric cables, and hoses. Moreover, the irradiation time is delayed and cleaning costs are increased because the equipment used in one observation well must be cleaned before sampling and moving to another observation well. Even though the equipment is washed, cross contamination may occur when sampling because a large number of observation wells to be investigated require the same equipment to be used for multiple observation wells. In particular, in the case of polluting through outdoor movement from time to time, manpower and investigation costs increase due to mobility limitations.

In the case of taking a sample using a conventional technique, in order to collect a sample existing at a depth of more than a predetermined depth from the groundwater surface, a device such as a baler or a hose must be inserted to the above depth. In this case, when the equipment such as the baler and the hose is inserted below the water level, the groundwater system is disturbed due to the equipment such as the baler and the hose, and an error occurs in the measurement of the pollutant. That is, when a groundwater sample is to be collected at a specific depth, if the observation well is not installed at the depth, the groundwater is mixed inside the observation well, and thus it is fundamentally impossible to collect an undisturbed sample. Therefore, in order to collect groundwater samples by depth, a plurality of observation wells are installed at various depths, or groundwater is separated and collected by depth using equipment such as a packer. In this case, the packer serves as a partition wall separating the space inside the observation well into a plurality of parts.

However, when a plurality of observation wells are provided, the observation cost increases, and the observation well itself acts as a contamination path that contaminates the groundwater system. In addition, when the packer is used to separate the space inside the observation well into a plurality of parts, the observation time increases and the observation efficiency decreases.

Finally, in the case of submersible pumps, groundwater disturbances and aeration are a concern in the process of transporting the observation wells and samples to the collection bottle. In particular, when the pollutant is a volatile organic compound, a part of the pollutant is volatilized by the disturbance and aeration, and an error occurs in the concentration measurement.

A first object of the present invention for solving the above problems is to provide a sampling device that is prevented from contamination and the cost is reduced.

It is a second object of the present invention to provide a sampling method using the sampling device as described above.

Sampling equipment according to an embodiment of the present invention for achieving the first object includes a sampling and fixing portion. The sampling unit accommodates a sampling solvent and the sampling solvent and the transmittance of the sampling solvent is less than that of the contaminants. The fixing unit surrounds and fixes the sample collection unit.

In the sampling method according to an embodiment of the present invention for achieving the second object, first, a collecting solvent is accommodated therein, and a storage container having a transmittance of the collecting solvent smaller than that of a contaminant is disposed in the sampling unit. Let's do it. Then, the sample collection unit is moved into the contaminant layer. Thereafter, contaminants in the contaminant layer are diffused into the receiving container. Finally, the sampling portion containing the contaminant is separated from the contaminant layer.

The present invention can be applied to the measurement of fluids such as groundwater, seawater, sewage, rainwater, wastewater, waste oil and the like.

Therefore, the groundwater system is not disturbed at the time of sampling, thereby enabling accurate measurement of contaminants. In addition, secondary contamination during the sampling process is reduced.

The sampling device is small in size and light in weight and therefore easy to move, and does not require additional equipment. It is also possible to store samples so that they can be analyzed in laboratories separated from contaminated places.

Moreover, disposable measurements are possible, which eliminates the need for cleaning of the sampling equipment and prevents cross contamination. In addition, samples of various depths can be taken, and measurements at two or more different depths simultaneously. In particular, when the pollutant is a volatile organic compound, a portion of the pollutant is prevented from being volatilized by the disturbance and aeration, thereby reducing the error in the concentration measurement.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

1 is a plan view showing a sampling device according to a first embodiment of the present invention, Figure 2 is an exploded view showing the sampling device shown in FIG.

1 and 2, the sample collection device includes a sample collection unit 100, the fixing unit 200 and the balance weight (30).

The sample collection part 100 includes a sampling solvent 11, a storage container 10 for receiving the sampling solvent 11, an upper suture 12, and a lower suture 13.

The sampling solvent 11 depends on the pollutant to be measured and includes distilled water, alcohol, and the like. In this embodiment, the collection solvent 11 includes distilled water.

The storage container 10 uses a semi-permeable membrane, synthetic resin, etc. having a higher permeability of the pollutant than the permeability of the collecting solvent (11). The synthetic resin is a low density polyethylene resin (LDPE), such as polyethylene (PE) -based resin, polypropylene (PP) -based resin, polyester (Polyester) resin, polyvinyl chloride Chloride (PVC) resin, polyurethane resin, polysilicon resin and the like. In this embodiment, the storage container 10 includes the low density polyethylene resin (LDPE). The low density polyethylene resin prevents the movement of water and simultaneously passes contaminants such as volatile organic substances. The low density polyethylene resin is produced by heating at a high pressure of 1,000 atm and 200 ° C. or higher using a small amount of air as a catalyst. The low-density polyethylene resin has a density of about 0.91, does not have sufficient molecular arrangements, and thus is easily elongated, and volatile organic substances can be moved between the low-density polyethylene molecules.

The storage container 10 may have a tube shape. At this time, the cross section of the storage container 10 may have a circular, polygonal, sawtooth. In addition, the storage container 10 may be a plastic bottle (not shown) that can be opened and closed with a stopper (not shown).

The upper seal 12 and the lower seal 13 bind the upper and lower portions of the storage container 10 to prevent the sampling solvent 11 from leaking out of the storage container 10. The upper suture 12 and the lower suture 13 may be bound using a string, or heat-sealed using a pharynx.

The fixing part 200 includes a protection net 20 and a connecting line 40. The protection net 20 surrounds the sample collection unit 100 and fixes the sample collection unit 100 in the horizontal direction. In this case, the sample collection part 100 may be deformed by a change in concentration in the storage container 10 or an impact when moving in the tubular crystal. Deformation of the sample collection unit 100 is prevented by the protection net 20. The connection line 40 is connected to the upper portion of the protective net 20 so that the sample collection part 100 can be moved in the vertical direction.

The balance weight 30 is connected to the lower portion of the protective net 20 to arrange the sampler 100 in the direction of gravity. In this case, the protection net 20 may be omitted, and the connecting line 40 and the counterweight 30 may be directly connected to the upper and lower portions of the sample collection part 100.

In the case of simultaneously measuring the concentration of contaminants at various depths, after connecting the plurality of sampling portions 100 and the plurality of fixing portions 200 in a line, the lower portion of the fixing portion disposed on the lowermost The counterweight 30 is arrange | positioned.

According to this embodiment as described above, the sample collection equipment can easily measure the concentration of contaminants, including the sampling solvent (11). It is also possible to simultaneously measure the concentration of contaminants at various depths.

Example 2

3 is a plan view showing a sample collection unit according to a second embodiment of the present invention. In the present embodiment, the rest of the components except the outlet and the cover are the same as in Example 1, and thus detailed description thereof will be omitted.

Referring to FIG. 3, an outlet 14 is formed in the storage container 10 ′. When the collection of the contaminant is completed, the collecting solvent 11 including the contaminant is discharged to the outside of the storage container 10 ′ through the outlet 14.

A cover 15 is disposed on the outlet 14 and the receiving container 10 ′ adjacent to the outlet 14 to control the extraction solvent 11 to be discharged through the outlet 14. When the cover 15 is covered, the collecting solvent 11 is isolated inside the storage container 10 '. However, when the cover 15 is peeled off, the collecting solvent 11 is discharged to the outside of the storage container 10 'through the outlet 14.

In this embodiment, the cover 15 comprises a cover 16 and a protrusion 17. The protrusion 17 is disposed on one side of the cover 16 and is connected to the cover 16 so that the cover 15 is easily separated from the storage container 10 ′.

According to the present embodiment as described above, it is possible to easily discharge the sampling solvent 11 containing contaminants to the outside of the storage container 10 'by using the discharge port 14 and the cover 15. .

Example 3

4 is a plan view showing a sample collection unit according to a third embodiment of the present invention. In the present embodiment, the rest of the components except for wrinkles are the same as in Example 1, and thus detailed description thereof will be omitted.

Referring to FIG. 4, a plurality of corrugations 9 are formed in the storage container 10 ″ to increase the surface area of the storage container 10 ″. When the surface area of the storage container 10 '' is increased, the area in which the storage container 10 '' is in contact with the contaminant layer (not shown) is increased to prevent contaminants in the contaminant layer (not shown). The amount of diffusion is increased. The corrugations 9 may be arranged in a horizontal direction, a vertical direction, a diagonal direction, or the like. In this embodiment, the pleats 9 are arranged in the transverse direction of the storage container 10 ''. In this case, the storage container 10 '' may include an embossed pattern instead of the pleats 9.

According to the present embodiment as described above, the surface area of the storage container 10 '' is increased to increase the amount of diffusion of the pollutant into the storage container 10 ''. Thus, the measurement time of the pollutant is reduced.

While not intending to limit the scope of the invention by theory, the collection of the contaminants can be explained by the Fick's Law. According to the law of the fix, when a substance with a high concentration and a substance with a low concentration come into contact, a solute transfer occurs between the two substances, and the concentration of the two substances becomes equal after a predetermined time. The concentration of contaminants in the groundwater layer is higher than the concentration of contaminants in the distilled water. A portion of the contaminant is moved by diffusion into the distilled water from the groundwater layer through the container. Therefore, after a predetermined time, the concentration of the contaminants in the groundwater layer becomes equal to the concentration of the contaminants in the storage container.

5 is a graph showing concentrations of a sampling solvent and a contaminating layer before sampling, and FIG. 6 is a graph showing concentrations of a sampling solvent and a contaminating layer after sampling.

Referring to FIG. 5, the concentration Cs of the contaminants in the sampling solvent before sampling is higher than the concentration Cb of the contaminants in the contaminant layer. The storage container, which is a semipermeable membrane, forms a boundary between the sampling solvent and the contaminant layer. When the concentration Cs of the contaminant in the sampling solvent and the concentration Cb of the contaminant in the contaminant layer are different from each other, the contaminant diffuses from the high concentration to the low concentration according to the law of the fix. Therefore, as time passes, the concentration of contaminants in the solvent is gradually increased. On the other hand, the size of the contaminant layer is much larger than that of the collection solvent, so that the concentration Cb of the contaminant in the contaminant layer is hardly changed.

Referring to FIG. 6, after a predetermined time passes, the concentration Cb of the contaminant in the contaminant layer is in equilibrium with the concentration Cs ′ of the contaminant in the collection solvent. Therefore, by measuring the concentration (Cs') of contaminants in the sampling solvent in the equilibrium state, it is possible to know the concentration (Cb) of the contaminants in the contaminant layer.

Sample Collection Method

7 is a cross-sectional view of the sampler installed in the observation well according to an embodiment of the present invention. Sampling equipment in the present embodiment is the same as in Example 1, detailed description thereof will be omitted.

Referring to Figure 7, first excavate the site to be measured to sell the observation well 50 that exposes the contaminated aquifer 70. The observation well 50 is deeper than the depth of the groundwater level 60 of the aquifer 70. In this case, in order to prevent soil from flowing into the observation well 50 or a part of the observation well 50 collapses, a casing (not shown) may be installed on the inner surface of the observation well 50. The diameter of the observation well 50 is larger than the diameter of the sampling equipment. In particular, when the casing (not shown) is installed on the inner surface of the observation well 50, the inner surface of the observation well 50 is non-uniform, so that the diameter of the observation well 50 is sufficiently larger than the sampling device.

Then, the sample collection unit 100 is moved to the depth to be measured. The sampling solvent 11, which is distilled water, is filled in the receiving container 10 of the sample collecting part 100. The storage container 10 includes a low density polyethylene resin (LDPE), and the collecting solvent 11 is confined in the storage container 10, but contaminants in the aquifer layer 70 pass therethrough. That is, contaminants in the aquifer layer 70 move into the storage container 10 through diffusion.

Subsequently, the concentration of the contaminant in the storage container 10 is left to equilibrate with the concentration of the contaminant in the aquifer layer 70 at the depth at which the sample collection part 100 is located.

Subsequently, when the concentration of the contaminant in the storage container 10 is in equilibrium with the concentration of the contaminant in the aquifer 70, the observation part 50 includes the sample collection part 100 including the contaminant. Depart from

Subsequently, the protection net 20 on the sample collection part 100 is removed. Subsequently, the concentration of the contaminants in the sampling solvent 11 is measured by making a hole in the sample collecting part 100.

According to this embodiment as described above, secondary pollution during sampling is prevented, and cost and time are reduced.

According to the present invention as described above, the groundwater system is not disturbed at the time of sampling, which enables accurate measurement of contaminants. In addition, secondary contamination during the sampling process is reduced. The sampling device is small in size and light in weight, easy to move, and does not require additional equipment. In addition, it is possible to store the sample so that it can be analyzed in a laboratory separated from the contaminated place.

Moreover, disposable measurements are possible, which eliminates the need for cleaning of the sampling equipment and prevents cross contamination. In addition, samples of various depths can be taken, and measurements at two or more different depths simultaneously. In particular, when the pollutant is a volatile organic compound, a portion of the pollutant is prevented from being volatilized by the disturbance and aeration, thereby reducing the error in the concentration measurement.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (12)

A sampling unit accommodating a collecting solvent and the collecting solvent and including a receiving container having a transmittance of the collecting solvent smaller than that of a contaminant; And Sampling equipment comprising a fixing unit for surrounding and fixing the sample collection. According to claim 1, Sample collection equipment characterized in that it further comprises a balance weight disposed under the sample collection portion arranged in the gravity direction of the sample collection portion. The sample collection device of claim 2, wherein the fixing unit comprises a net and a fixing rope for fixing the net. The sample collection device of claim 2, wherein the sample collection device includes a plurality of sample collection units, and the fixing unit connects the sample collection units in a line. According to claim 1, wherein the sampling solvent is a sampling device, characterized in that the water. The sample collection device according to claim 1, wherein the storage container comprises a synthetic resin. 2. The sampling device of claim 1, wherein the contaminant is a volatile organic compound. According to claim 1, wherein the storage container is formed with a discharge port for discharging the sampling solvent, the sample collection portion is disposed on the discharge port and the storage container adjacent to the discharge port has a cover for controlling the discharge of the collecting solvent Sampling equipment, characterized in that it further comprises. The sample collection device according to claim 1, wherein the storage container includes a plurality of corrugations for increasing the surface area. Disposing a storage container in a sampling unit in which a sampling solvent is stored therein and the transmittance of the collecting solvent is less than that of a contaminant; Moving the sampler into a contaminant layer; Diffusing contaminants in the contaminant layer into the receiving container; And Sampling method comprising the step of leaving the sampling portion containing the contaminant from the contaminant layer. 11. The method of claim 10, further comprising the step of selling the observation wells to expose the contaminant layer. The method of claim 10, wherein the contaminant layer comprises a groundwater layer, a seawater layer, a reservoir or a reservoir.

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