JP4492741B2 - Weighing device and sample analysis pretreatment device - Google Patents

Description

  The present invention relates to a weighing device for measuring the weight of a sample in a process of performing a pretreatment for soil analysis in agricultural land or sludge analysis in an environment-contaminated region, and a sample analysis pretreatment device using the same.

  Conventionally, with regard to the weighing device, it is known that the soil sample container is tilted, and then the container is vibrated and weighed. With this method, depending on the natural frequency of the soil particles as the sample, Differences in weighing time are likely to occur, especially in the case of a fine powdery soil sample, the sample will be scattered in the air inside the weighing device, so it will enter into other containers. There were a lot of problems. (See Patent Document 1 and Patent Document 2)

  Further, it is also disclosed that after tilting a container with a cap having a shape in which the supply port for the soil sample is narrowed, the container is rotated and weighed while supplying the sample. When the rotation speed of the container is changed, due to the influence of the nature of the soil to be weighed due to the strength of the rotation speed, clogging of the sample may occur at the tip supply port of the container cap when the sample container is tilted, When the sample container starts to tilt, there are many drawbacks and problems that a large amount of sample may come out at once from the opened supply port. Moreover, it has been difficult to increase the speed at which the sample container is tilted and the speed at which the sample container is rotated to a predetermined level or higher. (See Patent Document 3)

  In the sample supply device, in contrast to the constant and constant supply of the sample, the screw conveyance by the shaft rotating with the both ends having the screw fixed to the outer periphery has been conventionally used. In terms of interruptability and supply speed capability, it is still not sufficient and satisfactory. In particular, when a subtle and accurate amount of sample is intermittently supplied to individual containers, there is a problem in that even if the screw is stopped, the sample flows backward or sags to cause variation. (See Patent Document 4)

  Next, with respect to the liquid injection device, the sample supply means for supplying the sample to the extraction container by tilting and rotating the sample container to a predetermined angle, the measurement means, and the weighing value of the sample set in advance based on the measurement information Although one having a control means for controlling the sample supply means has been disclosed, in the structure of a conventional one-part injection device including these, after the first reagent is injected, the next When injecting the reagent, the entire line must be cleaned continuously for several minutes so that the reagent from the previous operation does not remain in the line. However, the work efficiency is extremely poor, and there is a problem that the continuous merit of high efficiency due to automation of work using a recent robot cannot be obtained. (See Patent Document 3)

As mentioned above, not all of the public properties have yet been solved for various drawbacks and problems, and no other effective technology has been found for these properties.
Therefore, there has been a strong demand from the market to improve the efficiency of comprehensive pretreatment work by improving weighing accuracy, improving efficiency, and reducing the pretreatment liquid injection time.

References

  Open 2000-337950   JP2003-161680   JP2007-163189   JP 2003-228761

  In order to solve these problems and to meet the demands of many markets, the present invention improves the weighing accuracy of the sample and the weighing device that can streamline the weighing operation, and the injection time of the pretreatment chemical solution. It is to provide a sample analysis pretreatment apparatus capable of improving the overall efficiency of sample analysis pretreatment work by shortening and continuous line cleaning after injection.

  In order to solve the above problems, the weighing device and the sample analysis pretreatment device of the present invention are provided with a supply port at a predetermined position of a lid of a cylindrical sample container having a bottom and inserted into the supply port. A sample container assembly comprising a spiral grooved shaft provided with a spiral groove having a predetermined depth on the outer periphery of a shaft that can rotate and slide in parallel with the axis; and the sample container assembly. Means for rotating in a predetermined posture; means for repeatedly extracting and inserting the spiral grooved shaft from the supply port; and a measurement container for receiving a sample supplied from the supply port; And a measuring device for measuring a weighing value of the sample.

  In addition, a supply port is provided at a predetermined position of the lid of the cylindrical sample container having the bottom, and it can be rotated while being inserted into the supply port, and can be continuously moved on the outer periphery of the shaft that can slide in parallel with the axis A sample container assembly including a spiral grooved shaft provided with a spiral groove having a predetermined depth, means for holding the sample container assembly in a predetermined posture, and rotating the spiral groove shaft and supplying a predetermined value from a supply port. Weighing provided with means for arbitrarily extracting the distance and inserting and moving and stopping, and a measuring container for receiving the sample supplied from the supply port and a measuring means for measuring the weighing value of the sample in the measuring container after supplying the sample Device.

  In addition to the weighing device described above, a measurement container containing a predetermined amount of sample, a chemical solution supply means for supplying a chemical solution, and a measurement means for measuring the measured value of the sample in the measurement container are provided. In the circuit for supplying the chemical solution and the cleaning solution, at least two systems for supplying the chemical solution and means for discharging the cleaning solution after cleaning each line are provided. The sample analysis pretreatment apparatus is characterized by being operated.

As described above, according to the weighing device, the sample supply device, and the sample analysis pretreatment device of the present invention, the following many excellent effects can be obtained.
According to the first aspect of the present invention, the supply port is provided at a predetermined position of the lid of the sample container, and can be rotated while being inserted into the supply port. By using a weighing device having a sample container assembly comprising a grooved shaft provided with a continuous spiral groove of a predetermined depth, the sample can be taken out and stopped arbitrarily in the weighing operation of the sample for analysis, It is easy to make minute adjustments of the weighing, and the sample container assembly is in a predetermined posture, and is rotated at an optimal downward inclination angle on the spot, and a shaft with a spiral groove is extracted from the supply port by a predetermined distance and inserted and moved. By providing a separate means for repeating, the mechanism of the apparatus is easy to understand and easy to handle. Therefore, since no special skill is required, anyone can easily obtain an efficient and extremely accurate weighing result, and can obtain stable analysis work and reliable data.

Also, the invention of claim 2 can provide the same effect as that of claim 1, but as a means for holding the sample container assembly in a predetermined posture, only a simple inclined holding stand may be used, and the apparatus becomes simple and compact. The portable storage is convenient and can be widely used for weighing medicines.
Furthermore, by reciprocating while rotating the shaft with the spiral groove, particularly in the case of supplying a large amount of sample or supplying the sample at a high speed, it is possible to exert an excellent effect on the efficiency of the weighing operation.
That is, in addition to the conventional normal screw conveyance “two-dimensional operation”, the rotary piston and the slide piston conveyance are simultaneously operated, so that it is a three-dimensional “three-dimensional operation” and the supply amount adjustment range is widened. The absolute ability supplied can also be improved.
In addition, as an actual embodiment, even in the case of the above-mentioned claim 1, even if the sample container is rotated separately, it is equivalent if it is related to the slide reciprocating motion of the spiral grooved shaft.

  Further, according to the invention of claim 3, by providing the chemical solution supply means as a plurality of systems and operating the chemical solution supply operation and the cleaning solution supply operation alternately, respectively, the liquid injection operation can be switched in a short time, and the cleaning is also performed. Since it can be performed sufficiently, the pre-processing work can be performed continuously, and the work efficiency can be significantly improved. Moreover, there is no residue of the sample or reagent that has been previously weighed, and a stable analytical value can always be obtained efficiently.

  As described above, the present invention has a great practical value that solves all of the conventional problems all at once and improves the efficiency of the pretreatment work together with the accurate weighing work as a whole.

Embodiments of the present invention will be described with reference to the drawings.
As mentioned above, embodiment of the weighing apparatus and sample analysis pretreatment apparatus of this invention shows the most preferable form of invention, and this invention is not limited to this.
FIG. 1 is a cross-sectional view from the side showing the configuration of the main part of the first embodiment of the weighing apparatus of the present invention. FIG. 2 is an enlarged front view in which a part of the sample container assembly of FIG. 1 is cut away.

    FIG. 2 also serves as a sample supply device of the present invention, and is not limited to the soil analysis of the present embodiment, and can supply accurate amounts of various drugs. Therefore, in addition to FIG. 2, it is also possible to provide a weighing apparatus by providing a measuring container for receiving the sample supplied from the supply port and a measuring means for measuring the weighing value of the sample in the measuring container after the sample is supplied. It is.

  As shown in FIGS. 1 and 2, 1 is a sample container assembly, 2 is a sample container holder, 3 is a shaft slide unit with a spiral groove, and 4A is a sample balance. The apparatus mainly includes a sample container assembly 1 that supplies a sample before weighing, a sample container holder 2 that holds the sample container assembly 1 in a posture that requires the sample container assembly 1, and a predetermined position where the sample container holder 2 is required. A holder moving unit 25 that moves to a position at a required tilt angle, a spiral grooved shaft slide unit 3 that slides the spiral grooved shaft 13 along the axis, and a sample supplied from the sample container And a measurement container 9 that is extracted and measured, and a sample balance 4A that measures a weighing value.

In the first embodiment, this apparatus is configured to automatically repeat a sample weighing operation in soil analysis or the like with various robots.
Therefore, in application in other scenes including manual work, a partial configuration can be omitted, arranged, or added.
For example, when a medical drug or the like is weighed, since it is performed in a certain narrow place, the holder moving unit 25 for moving the sample container holder 2 can be omitted.

A more detailed description of this device and its operation will be described below.
The sample container assembly 1 filled with the sample is inserted into the sample container holder 2 and fixedly held.
A rotating pulley 23 is provided at the rear end of the sample container holder 2 as means for rotating the sample container assembly 1 while holding the sample container assembly 1 in a downward inclined posture, and is connected to a stepping motor so that the sample is filled together with the sample container holder 2. The sample container assembly 1 is also rotated at the same time. This rotational speed can be arbitrarily changed or stopped.
Next, the spiral grooved shaft slide unit 3 having the shaft support arm 31 that slides in parallel with the spiral grooved shaft 13 is provided as means for repeatedly extracting and inserting the spiral grooved shaft 13 from the supply port 12a at a predetermined distance. The handle portion 13b of the spiral grooved shaft 13 inserted in the sample container assembly 1 filled with the sample is clamped to the shaft support arm 31 of the spiral grooved shaft slide unit 3, and the spiral grooved shaft is thereby clamped. 13 can only slide in parallel with the axis, and the movement in the radial direction is fixed.

The sample container holder 2 is supported by a holder stay 26, and the sample container assembly 1 is tilted so that the supply port 12a faces downward, and the supply port 12a is moved to a position above the opening of the measurement container 9. A moving unit 25 is provided.
The measurement container 9 is inserted and set in a measurement container holder 91 installed at the center of the sample balance 4A.
The sample balance 4A as a measuring means for measuring the weight value of the sample in the measurement container 9 after supplying the sample is made of an electronic method, and is installed on the upper surface of the balance table 41 having a vibration isolator on the lower surface.

  It is designed to automate the work of changing the optimum relationship position and posture of the above series of components by a microcomputer and a robot.

As shown in FIG. 2, the sample container assembly 1, which is the greatest point of the present invention, supplies a sample to a conical top on the open side of a sample container main body 11 having a cylindrical semi-spherical bottom. A spiral groove of a predetermined depth that is continuous with the outer periphery of the shaft that covers the sample container lid 12 having the mouth 12a, can rotate while being inserted into the supply port 12a, and can slide in parallel with the axis. The shaft 13 with the spiral groove provided with is inserted.
The spiral grooved shaft 13 is generally formed with a drill-shaped groove, which is a tool for making a hole in an object, on the outer periphery of a cylindrical shaft, and a supply port is provided at the root of the straight portion corresponding to the gripping portion of the drill. 12a is formed, and a stopper 13c of the same size is also formed at the tip of the stem portion 13b of the straight portion. Here, the shaft end is stopped and the shaft support arm 31 is stopped. Makes it possible to securely clamp the spiral grooved shaft 13.

  Since it is configured in this manner, the sample S sufficiently stored in the sample container body 11 surrounds the entire shaft 13 with the spiral groove, that is, a state where a drill bit is buried in the sample S and stuck. become. In this state, if the sample container assembly 1 is inclined at a predetermined angle so that the supply port 12a faces downward, the sample S falls by its own weight and approaches the supply port 12a and gathers. Thereafter, the spiral grooved shaft 13 is slid and pulled out by a predetermined length (here, about 5 mm), and when the sample container body 11 is rotated together with the sample container holder 2, the sample S to be weighed flows out from the supply port 12a.

Since the sample S rotates in synchronism with the sample container main body 11 and the spiral grooved shaft 13 does not rotate (synchronize), if the number of rotation is increased, a large amount of sample is continuously discharged and the sample is clogged at the supply port 12a. There is no end. In addition, if the shaft 13 with the spiral groove is inserted to the position of the lid 13a, there is no sample attrition (excessive material that hangs later), a small amount of adjustment can be easily performed, and the supply port 12a is directed downward. The sample flow can also be stopped completely.
The lid 13a for the spiral grooved shaft 13 may be provided as necessary, and if the sealing property between the supply port 12a and the spiral grooved shaft 13 can be sufficiently secured, the straight portion of the shaft (the portion without the spiral groove). ) Can completely stop the flow of the sample, and the lid 13a for the lid becomes unnecessary.

As a second embodiment of the weighing device, although not shown, a supply port is provided at a predetermined position of the lid of the sample container, and a spiral shape continuous to the outer periphery of a shaft that can be slid and rotated while being inserted into the supply port. A sample container assembly comprising a grooved shaft provided with a groove having a predetermined depth, a means for holding the sample container assembly in a downward inclined posture, such as a test tube holding stand, and the spiral grooved shaft rotationally moving. And a slide motion or reciprocating piston motion means that repeatedly removes and inserts a predetermined distance from the supply port, a measurement container that receives the sample supplied from the supply port, and a weighing of the sample in the measurement container after the sample is supplied And a measuring means for measuring the value.
That is, the sample container main body is fixed, and the three-dimensional operation is performed by rotating and reciprocating the shaft with the spiral groove.

In the second embodiment, the sample container is not rotated, but instead, the spiral grooved shaft is rotated, and the sample is supplied in the same manner as in the first embodiment. become.
In this case, since the spiral grooved shaft must be operated in a complex manner, there may be problems of complexity of the mechanism and high cost, but on the other hand, only the spiral grooved shaft is rotated and a predetermined distance from the supply port is set. Since the means for repeating the extraction and insertion movement may be used, it can be made a particularly compact device, can be used for a larger number of samples with a larger particle size, and can also supply a sample at a higher speed than in the first embodiment.

  Further, the next possibility is a sample supply device using the sample container assembly shown in FIG. 2, and by producing this mechanism with high accuracy and precision, various samples and various drugs can be obtained from trace amounts. A large amount can be supplied over a wide range. According to this, the sample supply is started or stopped by inserting and removing the spiral grooved shaft from the supply port by a predetermined length, and then the sample supply amount is controlled by rotating or rotating the sample by a predetermined angle. It can be directly connected to the measurement and packaging of the next process, and the range of application is greatly expanded.

FIG. 3 is a perspective view showing the configuration of the main part of the first embodiment of the sample analysis pretreatment apparatus of the present invention. FIG. 4 is a schematic view of a two-system chemical solution supply apparatus that supplies the six types of extracted chemical solutions in FIG.
The chemical solution supply apparatus of the present invention referred to here is the chemical solution tank 8, the chemical solution pipe 61, the switching valve 71, the liquid delivery pipe 6, the liquid delivery pump 7, the liquid injection nozzle 5, and the cleaning liquid tank and the cleaning liquid pipe shown in FIG. Is included.

As shown in FIG. 3, a liquid injection device B added adjacent to the weighing device A described in claim 1 is provided to form a series of sample analysis pretreatment devices.
This liquid injection device B is measured at a liquid solution balance 4B for liquid injection provided in the center with a measurement container holder 91 for receiving the measurement container 9 accurately weighed by the weighing device A, and at a position in front of the chemical liquid balance 4B. Two liquid injection nozzles 5 for injecting chemical liquids for component extraction into the container 9 are provided via a nozzle holder 51. These liquid injection nozzles 5 are moved over the opening of the measurement container 9, and after the liquid injection, A nozzle rotating / sliding machine 52 is provided for allowing the nozzle holder 51 for returning to the original position to rotate and slide.

Then, after injecting the chemical liquid, the liquid injection nozzle 5 is withdrawn from the position above the opening of the measurement container 9, and a waste liquid container 55 for receiving the excess chemical liquid falling from the liquid injection nozzle 5 at a predetermined position that receives the tip of the liquid injection nozzle 5. Is connected to a waste liquid tank (not shown) on the lower side of the setting table of the weighing platform 41 and discharged from there.
The waste liquid container 55 is also used for discharging a cleaning liquid (distilled water or purified water) for completely cleaning the nozzle and the chemical liquid passage after injecting one chemical liquid.

  The measuring container 9 storing the sample S weighed by the weighing device A is moved and installed at a predetermined position on the upper surface of the liquid pouring scale 4B of the liquid pouring device B by a robot or the like.

  What has been described above is a portion on the upper side of the sample analysis pretreatment apparatus, and a further necessary portion for injecting the chemical liquid into the nozzle is on the lower side of the installation base in this figure. Will be described.

FIG. 4 is a schematic view of a two-system chemical solution supply apparatus that supplies six types of chemical solutions in FIG. As shown in FIG. 4, the chemical supply apparatus includes two switching valves 71 each having six chemical liquid pipes 61 and six connection ports from six chemical liquid tanks 8 corresponding to six types of chemical liquids LA to LF. Two liquid delivery pumps 7 for pumping up each chemical solution are installed, and a liquid delivery pipe 6 is connected from the liquid delivery pump 7 to the two liquid injection nozzles 5 described above and connected. The two liquid injection nozzles 5 move one by one together with the liquid injection holder as indicated by the arrows in the figure, and a prescribed amount of chemical solution is injected at the upper position of the opening of the measurement container 9 to measure the liquid amount.

  In addition, in order to use the next chemical solution after the liquid injection operation, the inside of the liquid delivery pipe 7 and all the lines of the liquid delivery pipe 6 and the liquid injection nozzle 5 must be washed. Each of the cleaning liquid pipes 62 for sending the cleaning liquid H from the two cleaning liquid tanks 59 is connected to each switching valve 71.

In this way, by configuring a two-system chemical solution supply device that supplies a large number of chemical solutions, after injecting the chemical solution LA that is the first chemical solution, the chemical solution LB that is the second chemical solution to the measurement container after the next weighing Injecting the second chemical liquid LB from the second nozzle is performed continuously using another chemical liquid supply apparatus immediately without waiting.
And when moving to the 3rd chemical | medical solution LC or the 4th chemical | medical solution LD, the switching liquid 71 switches the piping connection, the cleaning liquid H is pumped up by the suction of the liquid delivery pump 7, and the inside is cleaned. Since this washing process is performed from the adjacent weighing device A shown in FIG. 3 until the next measurement container containing the weighed sample is set at a predetermined position of the liquid injection device B, the chemical solution tank 8 and the chemical solution Providing a large number (6, etc.) of pipes 61 greatly improves the work efficiency.
In addition, when using highly viscous drugs, etc., it is necessary to continuously flow the cleaning solution for a long time in order to clean the entire line until there is no drug residue. After injecting one line using a relatively low-drug chemical, wash the drug, and then continue to supply the next drug, and continue the high-viscosity drug line. It is possible to carry out sufficient cleaning by continuously washing and draining the waste liquid. As a result, there is no residual reagent, and a stable analysis value can always be obtained.

  As described above, after two types of chemicals have been completed on one pallet in succession, the work can proceed to the next pallet. Since the first chemical liquid supply path can be cleaned with the cleaning liquid, the third chemical liquid injection operation is prepared, and continuous and repeated liquid injection operations can be performed very efficiently. Since the loss time is remarkably reduced as a constant work by the robot, an extremely large efficiency effect can be obtained throughout.

  In this embodiment, the chemical solution supply device for supplying two chemical solutions is configured, but there may be cases where more than several types of chemical solutions are required, and multiple systems corresponding to these and many chemical solution tanks are provided. The one provided is also conceivable. In this case, if the problem of installation space and cost is solved, it is preferable that a higher efficiency can be obtained.

To explain the series of weighing and pre-processing operations,
1) A predetermined amount of powder sample that substantially fills the volume of the sample container main body 11 is stored and a conical sample container lid 12 is formed. Then, a spiral grooved shaft 13 is inserted from the supply port 12a at the top of the lid. And set in the sample container holder 2.
2) The sample container assembly 1 is transported to the weighing area by a robot and set at a predetermined position of the weighing device A.
3) The spiral grooved shaft 13 inserted into the container lid 12 of the sample container main body 11 is clamped to the shaft support arm 31.
4) The spiral grooved shaft 13 is rotated and moved so as to be in a horizontal position from the upper position of the sample container assembly 1.
5) The sample container assembly 1 is inclined downward within a range of 45 degrees from the horizontal position.
6) The sample container assembly 1 is rotated for each sample container holder 2, and the sample S is sent to the measurement container 9 and weighed by the sample balance 4A.
7) Set the measuring container 9 containing the accurately weighed sample in the liquid injection device B.
8) One liquid injection nozzle 5 is moved onto the measurement container 9 to inject a predetermined amount of liquid.
9) In the new sample, after the operations 1) to 6) above, the other injection nozzle 5 is continuously moved onto the new measurement container 9 to inject a predetermined amount.
10) When moving to another pallet, thoroughly wash the first extraction chemical solution, which should correspond to the third extraction solution, so that it is discharged from the injection nozzle 5 and the liquid delivery pipe 6.
11) The above process is automatically repeated, and the pretreatment is efficiently performed by the number of the predetermined types of extracts.

Furthermore, various modifications of the above-described embodiments are possible as other embodiments.
It is to be included in the range which does not deviate from the meaning, without being limited to the Example which described the shape, material, etc. of each said component.
For example, the sample container lid 12 does not have to be conical, the material of the spiral grooved shaft 13 has a small tribometer coefficient, the surface roughness of the groove is changed depending on the sample, It is conceivable that the shaft groove is not a sharp U-shape, and the V-shape is better for a fine sample and a small amount of powder. Furthermore, by changing the size and diameter of the sample container and the shaft with the spiral groove, it is possible to utilize it in more situations, meet a smaller amount of weighing requirements, and further improve the weighing speed. is there.

It is sectional drawing from the side which shows the principal part structure of the 1st Example of the weighing apparatus of this invention. FIG. 2 is an enlarged front view in which a part of the sample container assembly of FIG. 1 is cut away. It is a perspective view which shows the principal part structure of the 1st Example of the sample analysis pretreatment apparatus of this invention. FIG. 4 is a schematic view of a two-system chemical solution supply device that supplies six types of extracted chemical solutions in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sample container assembly 11 Sample container main body 12 Sample container lid 12a Supply port 13 Spiral groove shaft 13a Lid 13b Shaft 13c Stopper 2 Sample container holder 21 Sample container holder main body 22 Holder shaft 23 Rotating pulley 25 Holder moving unit 26 Holder Stay 3 Shaft Slide Unit 31 with Spiral Groove 31 Shaft Support Arm 32 Shaft Slide Machine 4A Sample Scale 4B Chemical Solution Scale 41 Scale Stand 5 Liquid Injection Nozzle 51 Nozzle Holder 52 Nozzle Rotation / Slide Machine 55 Waste Liquid Container 59 Cleaning Liquid Tank 6 Liquid Delivery Pipe 61 Chemical liquid pipe 62 Cleaning liquid pipe 7 Liquid delivery pump 71 Switching valve 8 Chemical liquid tank 81 Tank base 9 Measuring container 91 Measuring container holder A Weighing apparatus B Injection apparatus H Cleaning liquid S Sample LA Chemical liquid A
LB Chemical B
LC Chemical C
LD chemical D
LE Chemical E
LF Chemical F

Claims (3)

  A spiral provided continuously on the outer periphery of the shaft that can be rotated while being inserted into the supply port at a predetermined position on the lid of a cylindrical sample container having a bottom and can be slid in parallel with the axis A sample container assembly comprising a spiral grooved shaft provided with a groove having a predetermined depth, means for rotating the sample container assembly in a predetermined posture, and extracting the spiral groove shaft from a supply port by a predetermined distance; A weighing apparatus comprising: means for repeating insertion movement; and a measuring container for receiving a sample supplied from the supply port and a measuring means for measuring a weighing value of the sample in the measuring container after the sample is supplied.   A spiral provided continuously on the outer periphery of the shaft that can be rotated while being inserted into the supply port at a predetermined position on the lid of a cylindrical sample container having a bottom and can be slid in parallel with the axis A sample container assembly comprising a spiral grooved shaft provided with a groove having a predetermined depth, a means for holding the sample container assembly in a predetermined posture, and rotating the spiral groove shaft and a predetermined distance from the supply port. A means for arbitrarily repeating extraction, insertion movement, and stopping, and a measurement container for receiving a sample supplied from the supply port and a measurement means for measuring a weighing value of the sample in the measurement container after the sample supply are provided. Weighing device.   In addition to the weighing device according to claim 1 or 2, a measurement container containing a predetermined amount of sample, a chemical solution supply means for supplying a chemical solution, and a measurement means for measuring the measured value of the sample in the measurement container; In the circuit for supplying the chemical solution and the cleaning solution, at least two systems for supplying the chemical solution and the discharge unit for the cleaning solution after the cleaning of each line are provided, and one of the system lines is always after the chemical supply operation. A sample analysis pretreatment apparatus that is operated for cleaning work in a line.

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