JP6905832B2 - Liquid analysis system and liquid analysis method - Google Patents

Description

The present invention relates to a liquid analysis system and a liquid analysis method.

Water quality analysis of river water, lake water, seawater, or factory effluent is carried out by various methods. In particular, in order to analyze substances dissolved in water, it is necessary to remove suspended or suspended foreign substances before analysis. For example, Patent Document 1 discloses a method of analyzing a sample solution after removing suspended or suspended foreign substances with a filter.

International Publication No. 2008/6603

In the liquid analysis as disclosed in Patent Document 1, it is necessary to collect a sample liquid from the sea, a lake, or the like, and put the collected liquid into an analyzer. Therefore, the liquid cannot be analyzed automatically. Further, in liquid analysis as disclosed in Patent Document 1, a very fine filter may be used. However, foreign substances of various sizes such as solids (sand particles, etc.), dead leaves, or seaweed are mixed in the liquid to be analyzed, so if such a fine filter is used, the filter will be visible. Causes clogging. Therefore, it is necessary to change the filter for each analysis, and the liquid cannot be analyzed continuously.

An object of the present invention is to provide a liquid analysis system capable of automatically and continuously analyzing a liquid.

The liquid analysis system of the present invention is installed in a liquid and is fluidly connected to a liquid sampling pump that pumps the liquid and the liquid that is fluidly connected to the liquid sampling pump and pumped by the liquid sampling pump as a foreign substance by centrifugal force. It includes a centrifuge that separates into a sample liquid, and an analyzer main body that is fluidly connected to the centrifuge and analyzes the sample water sent from the centrifuge.

According to this configuration, each component is fluidly connected from a liquid source such as river water, lake water, seawater, or factory wastewater to the main body of the analyzer, that is, it is configured in-line. Therefore, it is possible to automate a series of steps of collecting a liquid from a liquid source, removing foreign matter from the liquid, and analyzing the liquid from which the foreign matter has been removed, that is, the liquid can be analyzed automatically. In addition, since the centrifuge is used without using a filter to remove foreign substances, the liquid can be continuously analyzed without the need for replacement of the filter.

The centrifuge has a rotating container that can store the pumped liquid and is rotatable around the central axis, and is arranged concentrically with the central axis in the rotating container and has a symmetrical shape with respect to the central axis. And a structure provided with a sampling port for collecting the sample water for sending to the analyzer main body may be further provided on the side portion.

According to this configuration, by providing the structure concentrically with the central axis in the rotary container, it is possible to prevent the generation of a vortex containing air bubbles that should normally be formed in the vicinity of the central axis in the rotary container. If a vortex containing bubbles is generated near the central axis, the analysis may be hindered by involving the bubbles during water sampling. Therefore, it is effective to be able to prevent this. Further, when the foreign matter is separated by centrifugal force, the position where the foreign matter collects differs depending on the specific gravity of the foreign matter. Specifically, foreign matter having a relatively large specific gravity gathers in the region near the inner wall of the rotary container, and foreign matter having a relatively small specific gravity gathers in the lower region of the structure in the center of the rotary container. Therefore, by providing a sampling port on the side of the structure, the area near the inner wall of the rotating container and the lower area of the structure in the center of the rotating container are avoided, that is, the liquid in the portion where foreign matter is not collected is sampled. Can be collected as water.

The lower end position of the structure may be 10 to 90% of the liquid depth when the rotating container is filled with the predetermined amount of the liquid. Further, the maximum diameter of the structure may be 10 to 90% of the inner diameter of the rotary container.

According to this configuration, in the axial direction of the central axis, the foreign matter floating on the liquid surface in the rotary container and the foreign matter having a relatively small specific gravity collected in the lower region in the center of the rotary container are avoided. Since the sampling port is provided, it is possible to obtain sample water from which foreign substances have been removed. Further, in the radial direction of the central axis, the foreign matter having a relatively large specific gravity collected in the region near the inner wall of the rotary container and the foreign matter having a relatively small specific gravity collected in the lower region of the central structure of the rotary vessel. Since the sampling port is provided at a position avoiding the above, it is possible to obtain sample water from which foreign substances have been removed.

A drainage port may be provided at the lower part of the rotary container. A liquid injection port may be provided at the lower part of the rotary container.

According to these configurations, since the liquid injection port is provided at the bottom of the rotary container, when the liquid is injected into the rotary container, the liquid does not flow down vigorously and the liquid in the rotary container is prevented from being agitated. can. Therefore, it is possible to prevent the sample water and the foreign matter from being mixed. Further, since the drainage port is provided at the lower part of the rotary container, the inner surface of the rotary container can be cleaned when the liquid is discharged from the rotary container, and foreign matter can be prevented from remaining in the rotary container.

A cleaning liquid injection port may be provided in the center of the upper part of the rotary container, and the upper part of the structure may have a conical shape.

According to this configuration, since the cleaning liquid injection port is provided in the center of the upper part of the rotary container, the cleaning liquid can be injected from the upper part. Further, since the upper part of the structure has a conical shape, the cleaning liquid injected from the injection port hits the conical shape of the upper part of the structure and scatters toward the inner wall of the rotating container. Therefore, the inner wall of the rotating container can be cleaned with the scattered cleaning liquid.

The liquid analysis system may further include a filter for filtering the sample water interposed between the rotary container and the analyzer main body.

According to this configuration, the foreign matter that could not be completely separated by the centrifuge can be removed by the filter. Further, since the filter is provided downstream of the centrifuge and foreign substances that cause clogging of the filter are removed in advance, clogging of the filter can be suppressed. That is, the period until the filter is replaced can be lengthened and the continuous operation time can be extended as compared with the case where only the filter is installed.

The liquid analysis system sucks out the sample water from the rotating container and sends the sample water toward the analyzer main body, and the liquid feeding pump so as to intermittently reverse the filtrate that has passed through the filter. A control device having a filter cleaning control unit for controlling the above may be further provided.

According to this configuration, the filter can be washed by the filtrate that has passed through the filter, so that clogging of the filter can be suppressed. Therefore, the period until the filter is replaced can be extended and the continuous operation time can be extended as compared with the case where nothing is done.

The liquid analysis system further comprises a control device having a rotating liquid feed control unit that drives the liquid feed pump during rotation of the rotary container to suck out the sample water from the rotary container and send it toward the analyzer main body. Be prepared.

Even if the suspension or the like is separated by centrifugation, if the rotation of the rotating container is stopped, the separated foreign matter will be diffused again. However, according to this configuration, the liquid can be sent while the rotating container is rotating. Only the sample water from which the foreign matter has been separated can be sent to the main body of the analyzer.

In the liquid analysis method of the present invention, a liquid is directly pumped from a liquid source, the liquid is sent to a centrifuge, the liquid is separated into a foreign substance and sample water by the centrifuge, and the sample water is separated into an analyzer main body. The sample water is automatically and continuously analyzed by the analyzer main body.

In the liquid analysis method, when the liquid is separated into the foreign matter and the sample water in the centrifuge, the sample water is a region near the inner wall of the centrifuge and the vicinity of the rotation center of the centrifuge. It may further include collecting the liquid in the region other than the region of the sample water as the sample water.

The liquid analysis method may further include injecting and draining the liquid from the bottom and injecting the cleaning liquid from the top in the centrifuge.

In the liquid analysis method, a filter arranged between the centrifuge and the analyzer main body is further prepared, and the sample water interposed between the centrifuge and the analyzer main body is subjected to the filter. It may further include filtering.

The liquid analysis method may further include washing the filter by intermittently regurgitating the filtered sample water.

According to the present invention, in the liquid analysis system, since each component is configured in-line, it is possible to provide a liquid analysis system capable of automatically and continuously analyzing a liquid.

The system diagram of the liquid analysis system which concerns on embodiment of this invention. A partial cross-sectional view showing the details of the primary filter unit. Front view showing the details of the secondary filter. Control block diagram of the liquid analysis system. The graph which shows the influence which the removal of foreign matter by a primary filter part and a secondary filter part has on an analysis.

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

As shown in FIG. 1, the liquid analysis system 1 of the present embodiment includes a liquid collection pump 100, a primary filter unit 200, a secondary filter unit 300, an analyzer main body 400, and a control device 500. The liquid collection pump 100, the primary filter unit 200, the secondary filter unit 300, and the analyzer main body 400 are fluidly connected, that is, they are configured in-line. Further, a cleaning liquid tank 210 is fluidly connected to the primary filter unit 200. The liquid analysis system 1 separates the liquid pumped by the liquid sampling pump 100 into foreign matter and sample water by the primary filter unit 200 and the secondary filter unit 300, and analyzes the sample water by the analyzer main body 400. The liquid to be analyzed is river water, lake water, seawater, or factory effluent. In this embodiment, the concentrations of nutrient salts such as nitrate nitrogen, nitrite nitrogen, and ammonia nitrogen dissolved in seawater are analyzed.

The liquid collection pump 100 of the present embodiment is a floating type and is used while floating on the sea surface. The liquid collection pump 100 pumps seawater to be analyzed from the suction port 101 and sends it to the primary filter unit 200. However, the mode of the liquid collection pump 100 may be other than the floating type, for example, the submerged type that is submerged in water. Further, if the suction port 101 is installed in seawater, the liquid sampling pump 100 itself can be installed at any place regardless of the installation place.

As shown in FIG. 2, the centrifuge 220 is provided in the primary filter unit 200. The centrifuge 220 includes a rotary container 221 that can store the pumped seawater and is rotatable around the central axis L. Further, the centrifuge 220 is arranged concentrically with the central axis L in the rotary container 221 and has a symmetrical shape with respect to the central axis L. A structure 222 provided with a mouth 222c is provided.

The rotary container 221 is composed of a conical container that is substantially convex downward, and has a shape symmetrical with respect to the central axis L. A cleaning liquid injection port 221a is provided in the center of the upper part of the rotary container 221, and the injection port 221a is connected to the cleaning liquid tank 210 (see FIG. 1). Further, the injection port 221a is connected to a cleaning liquid pipe 221b extending in the rotary container 221 and the cleaning liquid sent from the cleaning liquid tank 210 is injected into the rotary container 221 through the cleaning liquid pipe 221b. Further, a liquid injection port (drainage port) 221c for injecting and draining seawater is provided in the lower part of the rotary container 221. In the present embodiment, the liquid injection port 221c and the liquid drain port 221c are common. A support pipe 221d extends downward from the liquid injection port (drainage port) 221c. The support tube 221d is provided integrally with the rotary container 221. A drive mechanism 231 connected to the motor 230 is arranged around the support pipe 221d, and the drive mechanism 231 is fastened to the rotary container 221 by screwing. Further, a bearing mechanism 232 is arranged around the support pipe 221d and around the cleaning liquid pipe 221b. Therefore, the rotary container 221 is rotated by the drive mechanism 231 that receives the driving force from the motor 230 in a state where the support pipe 221d and the cleaning liquid pipe 221b are supported by the bearing mechanism 232. Further, the support pipe 221d is connected to the T-shaped joint 240 at the lower end. The pipe 241 extending laterally from the T-shaped joint 240 is connected to the liquid sampling pump 100, and the pipe 242 extending downward from the T-shaped joint 240 is opened toward seawater via the solenoid valve 243. That is, in the T-shaped joint 240, seawater is pumped by the liquid sampling pump 100 toward the rotary container 221 in the direction of arrow A and drained from the rotary container 221 in the direction of arrow B by its own weight. Further, the solenoid valve 243 is opened and closed by the control device 500 as described later.

The structure 222 has a substantially columnar shape extending in the direction along the central axis L. A conical portion 222a is provided on the upper portion of the structure 222, and the conical portion 222a has a conical shape that extends radially outward from the central axis L in a circular shape and is inclined downward. A spherical portion 222b is provided at the lower portion of the structure 222, and the spherical portion 222b has a hemispherical shape. Since the spherical surface portion 222b is hemispherical, the flow of the liquid when the rotary container 221 is rotating is not obstructed. From this point of view, the shape of the lower part of the structure 222 is not limited to the hemispherical shape, and may be a flat shape or a conical shape that does not obstruct the flow of the liquid. On the lower side of the structure 222, a sampling port 222c for collecting seawater in the rotary container as sample water for sending it to the analyzer main body 400 is provided. In the present embodiment, four collection ports 222c are provided around the central axis L on the circumference of the structure 222 at equal intervals. The collection port 222c is connected to the secondary filter unit 300 through a collection tube 222d extending upward along the central axis L in the structure 222. The collection pipe 222d and the cleaning liquid pipe 221b partially form a double pipe structure, and above the rotary container 221 the sampling pipe 222d is arranged inside and the cleaning liquid pipe 221b is arranged outside.

Explaining the outer shape of the structure 222 in detail, the upper end of the structure 222 is located near the upper end of the rotary container 221 and the lower end is the liquid depth when the rotary container 221 is filled with a predetermined amount of seawater (see the broken line). It is located at about 70%. Here, the predetermined amount of liquid is an amount of liquid suitable for separating seawater into foreign matter and sample water by the centrifuge 220, and in the present embodiment, the rotary container 221 is usually operated in a full state. .. In particular, the lower end of the structure 222 is preferably located at 10 to 90% of the liquid depth when the rotary container 221 is filled with this predetermined amount of liquid. That is, it is preferable that the lower end of the structure 222 is not located near the upper limit and the lower limit of the rotary container 221. Further, the maximum diameter of the structure 222 is about 25% when viewed from the central axis L direction. Here, the maximum diameter of the structure 222 is preferably 10 to 90% of the inner diameter of the rotary container 221. That is, it is preferable that the outer surface of the structure 222 is not located near the inner wall of the rotary container 221 and near the central axis L. By doing so, in the radial direction of the central axis L, foreign matter having a relatively large specific gravity collected in the region near the inner wall of the rotary container 221 and the foreign matter collected in the lower region of the central structure 222 of the rotary container 221. A sampling port 222c can be provided at a position avoiding foreign matter having a relatively small specific gravity, and sample water from which foreign matter has been removed can be obtained. Further, in the axial direction of the central axis L, the collection port 222c can be provided at a position to avoid foreign matter floating on the liquid surface in the rotary container 221 and foreign matter sunk on the bottom surface in the rotary container 221. Can be obtained as a sample water from which is removed. Further, in the primary filter unit 200, the rotary container 221 is housed in the casing 250 and fixed to the casing 250 at a plurality of places by screwing.

As shown in FIG. 3, the secondary filter unit 300 is provided with a membrane filter (filter) 310. The membrane filter 310 of the present embodiment is a filter in which, for example, a filter having three pore diameters of 0.45 μm, 1.2 μm, and 8.0 μm is combined. A liquid feed pump 320 is provided below the membrane filter 310, and the liquid feed pump 320 is connected to the sampling pipe 222d of the primary filter unit 200 and the lower surface of the membrane filter 310 through a pipe 321. The liquid feed pump 320 can rotate forward and reverse, and is driven and controlled by the control device 500 as described later. Here, when the liquid feed pump 320 is driven in the forward rotation, the liquid is sent in the direction of arrow C so as to pass through the membrane filter 310 from the bottom to the top, and when the liquid feed pump 320 is driven in the reverse rotation, the liquid is sent from the top. The liquid will be sent downward in the direction of arrow D so as to pass through the membrane filter 310. The sample water in the pipe 321 from which the foreign matter has been removed from the liquid by the centrifuge 220 is powered by the liquid feed pump 320 and passes through the membrane filter 310 from the bottom to the top. At this time, the sample water is further filtered by the membrane filter 310. A filtrate tank 330 is provided above the membrane filter 310, and the filtrate filtered by the membrane filter 310 can be stored in the filtrate tank 330. A pipe 322 is connected to the center of the upper part of the filtrate tank 330, and the pipe 322 extends to the analyzer main body 400.

As shown in FIG. 4, the control device 500 includes a solenoid valve control unit 510, a filter cleaning control unit 520, and a liquid feed control unit 530 during rotation. The solenoid valve control unit 510 controls the solenoid valve 243 that opens and closes the drainage port 221c of the rotary container 221. Further, the filter cleaning control unit 520 controls the liquid feed pump 320 which is normally driven in the forward rotation, and intermittently drives the liquid feed pump 320 in the reverse rotation to reverse the filtrate that has passed through the membrane filter 310. When the liquid feed pump 320 is driven in the reverse rotation, the filtrate in the filtrate tank 330 flows back, that is, it passes through the membrane filter 310 from top to bottom (see arrow D in FIG. 3). As a result, the membrane filter 310 can be cleaned at predetermined time intervals. Here, the predetermined time differs depending on the properties of the membrane filter 310 and the like, and a time suitable for cleaning the membrane filter 310 can be set. Further, the liquid feed control unit 530 during rotation controls the liquid feed pump 320, drives the liquid feed pump 320 during the rotation of the rotary container 221 to suck out the sample water from the rotary container 221 and analyzes the secondary filter unit 300. It is sent toward the device main body 400. Even if the suspension or the like is separated by centrifugation, if the rotation of the rotary container 221 is stopped, the separated foreign matter will be diffused again. However, by this control, the liquid can be sent during the rotation of the rotary container 221. Therefore, only the sample water from which the foreign matter has been separated can be sent to the analyzer main body. The rotating liquid feed of the rotary container 221 may be executed based on, for example, a signal from a sensor (not shown) for detecting the rotation of the rotary container 221, and particularly such a signal is detected. Instead, it may be executed after the rotation start command for the rotary container 221.

The analyzer main body 400 (see FIG. 1) analyzes the sample water from which the suspended or suspended foreign matter has been removed by the primary filter unit 200 and the secondary filter unit 300. As an analysis principle, a flow analysis method can be used. Furthermore, among the flow analysis methods, the flow injection (FIA) analysis method can be used. Specifically, the water quality test method based on the flow analysis method of JIS K0170: 2011 is adopted. When the specified reaction solution is mixed with seawater containing nutrients, the color develops according to the type and concentration of the target nutrients, so the nutrient concentration can be obtained by measuring the absorbance at a specific wavelength. For example, hydrochloric acid acidic naphthylethylenediamine coloring FIA method is used for nitrite nitrogen, cadmium reduction / hydrochloric acid acidic naphthylethylenediamine coloring FIA method is used for nitrate nitrogen, and indophenol blue coloring FIA method using phenol is used for ammonia nitrogen. Absorbance can be measured and nutrient concentration can be analyzed.

As shown in FIG. 5, seawater from which suspended or suspended foreign matter has not been removed, sample water that has passed only the primary filter unit 200 (primary filter only), and the primary filter unit 200 and the secondary filter unit 300 The passed sample water (primary filter + secondary filter) is compared from the viewpoint of absorbance. While the absorbance of seawater is about 0.12, the absorbance after passing through the primary filter unit 200 is greatly reduced to about 0.04. Further, the absorbance is reduced to about 0.0004 by adding the secondary filter unit 300. Therefore, it is possible to analyze with high accuracy without the disturbance of light scattering by the suspension.

According to this embodiment, each component is fluidly connected from a liquid source such as seawater to the analyzer main body 400, that is, it is configured in-line. Therefore, it is possible to automate a series of flow of collecting seawater from the sea, removing foreign matter from the seawater, and analyzing the sample water from which the foreign matter has been removed, that is, it is possible to analyze the seawater automatically and continuously.

Further, by providing the structure 222 concentrically with the central axis L in the rotary container 221, it is possible to prevent the generation of a vortex containing air bubbles that should normally be formed in the vicinity of the central axis L in the rotary container 221. If a vortex containing air bubbles is generated near the central axis L, it may become an obstacle when separating foreign matter by centrifugal force, so it is effective to be able to prevent this. Further, when the foreign matter is separated by centrifugal force, the position where the foreign matter collects differs depending on the specific gravity of the foreign matter. Specifically, foreign matter having a relatively large specific gravity collects in the region near the inner wall of the rotary container 221, and foreign matter having a relatively small specific gravity gathers in the lower region of the structure 222 in the center of the rotary container 221. Therefore, by providing the sampling port 222c on the side of the structure 222, the region near the inner wall of the rotary container 221 and the lower region of the structure 222 in the center of the rotary container 221 are avoided, that is, foreign matter is not collected. Part of the liquid can be collected as sample water.

Further, since the liquid injection port (drainage port) 221c is provided in the lower part of the rotary container 221, when the seawater is injected into the rotary container 221, the seawater does not fall and the seawater in the rotary container 221 is agitated. Can be prevented. Therefore, it is possible to prevent the sample water and the foreign matter from being mixed.

Further, since the cleaning liquid injection port 221a is provided in the center of the upper part of the rotary container 221, the cleaning liquid can be injected from the upper part. Further, since the upper portion of the structure 222 has a conical portion 222a, the cleaning liquid injected from the injection port hits the conical portion 222a on the upper portion of the structure 222 and scatters toward the inner wall of the rotary container 221. Therefore, the inner wall of the rotary container 221 can be cleaned with the scattered cleaning liquid.

Further, the foreign matter that could not be completely separated by the centrifuge 220 can be removed by the membrane filter 310. Further, since the membrane filter 310 is provided downstream of the centrifuge 220 and foreign substances that cause clogging of the membrane filter 310 are removed in advance, clogging of the membrane filter 310 can be suppressed. That is, the period until the membrane filter 310 is replaced can be lengthened and the continuous operation time can be extended as compared with the case where only the membrane filter 310 is installed.

Further, because of the control by the filter cleaning control unit 520, the membrane filter 310 can be intermittently cleaned by the filtrate that has passed through the membrane filter 310, and clogging of the membrane filter 310 can be suppressed. Therefore, the period until the membrane filter 310 is replaced can be lengthened and the continuous operation time can be extended as compared with the case where nothing is done.

Further, since the liquid injection port (drainage port) 221c is provided in the lower part of the rotary container 221, drainage can be performed from the lower part of the rotary container 221. The drainage can clean the inner wall of the rotary container 221 and remove residual foreign matter and the like.

1 Liquid analysis system 100 Liquid collection pump 101 Suction port 200 Primary filter unit 210 Cleaning liquid tank 220 Centrifuge 221 Rotating container 221a Injection port 221b Cleaning liquid pipe 221c Liquid injection port (drainage port)
221d Support pipe 222 Structure 222a Conical part 222b Spherical part 222c Sampling port 222d Sampling pipe 230 Motor 231 Drive mechanism 232 Bearing mechanism 240 T-shaped joint 241,242 Piping 243 Solenoid valve 250 Casing 300 Secondary filter part 310 Membrane filter (filter) )
320 Liquid feed pump 321 322 Piping 330 Filter tank 400 Analyzer body 500 Control device 510 Solenoid valve control unit 520 Filter cleaning control unit 530 Liquid transfer control unit during rotation

Claims (13)

A suction port is installed in the liquid, and a liquid sampling pump that pumps the liquid and
A centrifuge that is fluidly connected to the liquid collection pump and separates the liquid pumped by the liquid collection pump into foreign matter and sample water by centrifugal force.
It is provided with an analyzer main body that is fluidly connected to the centrifuge and analyzes the sample water sent from the centrifuge .
The centrifuge
A rotating container that can store the pumped liquid and can rotate around the central axis.
It is arranged concentrically with the central axis in the rotary container, has a symmetrical shape with respect to the central axis, and is provided with a sampling port for collecting the sample water to be sent to the analyzer main body at the side portion. With structure
With more
A liquid analysis system in which the maximum diameter of the structure is 10 to 90% of the inner diameter of the rotary container. The lower end position of the structure, the liquid is 10 to 90% of the depth when filled with a predetermined amount of the liquid in the rotating container, a liquid analysis system according to claim 1. The liquid analysis system according to claim 1 or 2, wherein a drainage port is provided in the lower part of the rotary container. The pouring hole at the bottom of the rotating container is provided, the liquid analysis system according to any one of claims 1 to 3. A cleaning liquid injection port is provided in the center of the upper part of the rotary container.
The upper part of the structure has a conical shape, a liquid analysis system according to any one of claims 1 to 4. A filter disposed between the rotating container and the analyzer body, further comprising a liquid analysis as claimed in any one of claims 5 to filter for filtering the sample water system. A liquid feed pump for sucking out the sample water from the rotary container and sending it toward the analyzer main body,
The liquid analysis system according to claim 6 , further comprising a control device having a filter cleaning control unit that controls the liquid feed pump so that the filtrate that has passed through the filter flows back intermittently. 7. A control device further comprising a rotating liquid feed control unit that drives the liquid feed pump during rotation of the rotary container to suck out the sample water from the rotary container and send the sample water toward the analyzer main body. The liquid analysis system described in. A liquid feed pump for sucking out the sample water from the rotary container and sending it toward the analyzer main body,
The claim further comprises a control device having a rotating liquid feed control unit that drives the liquid feed pump during rotation of the rotary container to suck out the sample water from the rotary container and send the sample water toward the analyzer main body. The liquid analysis system according to any one of claims 1 to 6. Pumping liquid directly from the liquid source,
The liquid is sent to the centrifuge and
The liquid is separated into foreign matter and sample water by the centrifuge.
The sample water is sent to the main body of the analyzer and
It is a liquid analysis method that automatically and continuously analyzes the sample water by the analyzer main body .
In the centrifuge, when the liquid is separated into the foreign matter and the sample water, the region excluding the region near the inner wall of the centrifuge and the region near the center of rotation of the centrifuge is excluded as the sample water. A liquid analysis method further comprising collecting the liquid in the sample water as the sample water during the rotation of the centrifuge . The liquid analysis method according to claim 10, further comprising injecting and discharging the liquid from the lower part and injecting the cleaning liquid from the upper part in the centrifuge. Further preparing a filter arranged between the centrifuge and the analyzer body,
The liquid analysis method according to claim 10 or 11, further comprising filtering the sample water interposed between the centrifuge and the analyzer main body by the filter. The liquid analysis method according to claim 12 , further comprising washing the filter by intermittently regurgitating the filtered sample water.

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