JPS5994071A - Specimen liquid sampling apparatus in flow type analysis - Google Patents

Abstract

PURPOSE:To make it possible to shorten an analytical time and to conserve a specimen required in analysis, by providing a means for up and down driving a specimen suction pipe so that the leading end of said suction pipe is intermittently immersed in the specimen solution. CONSTITUTION:When a specimen container C is placed under a specimen suction pipe 2 and a motor 8 is operated, a slinder 10 begins to move downwardly and the specimen suction pipe 2 attached thereto is fallen. When a pump P is operated at this point of time, the suction pipe 2 is continuously fallen while sucking air to reach a specimen solution at the leading end thereof and further continuously fallen while sucking the specimen solution. When the suction pipe 2 is fallen to a predetermined position, the protruded piece 12 of the slider 10 operates a falling switch 7 while the motor 8 is reversed by a motor control circuit 13 to raise the slinder 10. During rising, the leading end of the specimen suction pipe 2 is exposed to air and upwardly moved while sucking air until reaches an upper limit switch 6 and again moved downwardly by the reversal of the motor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sampling device suitable for a flow type ion concentration detector.

To supply the sample solution to the flow-type ion concentration detector, a sampling device with a pump on one side of the measurement cell and a sample suction tube on the other side is used. The sample solution was continuously fed to the measurement cell. However, with such a sampling device,
Since the previous sample solution adhering to the piping system and measurement cell cannot be drained smoothly, a large amount of sample solution must be sucked out to facilitate the discharge of the remaining sample, which increases sample consumption and analysis time. There was a problem.

In view of these problems, the present invention provides an improved sampling device that allows residual sample to be quickly discharged by alternately transporting sample solution and air, thereby allowing analysis to be performed in a short time with a small amount of sample. The purpose and aim is to provide.

Therefore, details of the present invention will be explained below based on illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, in which reference numeral l denotes a vertical mechanism that intermittently immerses the tip of the sample suction tube 2 in the sample solution, and is rotatably mounted on the machine frame 3. A screw punch 4 installed vertically is connected to a motor 8 which is rotated in forward and backward directions by a lower limit switch 6.7 via an appropriate reduction gear train 9, and is screwed onto this screw punch 4, as will be described later. A suction tube 2 is suspended into the sample container C from one side of the measurement cell 11 by a slider 10 that moves downward.
It is configured to hold a part of the body and move it up and down. Note that reference numeral 12 in the figure is a protrusion provided at the tip of the slider 10, which is attached to the upper and lower limit switch 6, which is attached at a position where the tip of the suction tube 6 moves up and down with respect to the liquid level of the sample solution.
Reference numeral 13 indicates a motor control circuit for switching the direction of rotation of the motor 8 in accordance with signals from the lower limit switches 6 and 7, respectively.

In this embodiment, a sample container C is placed below the sample suction tube 2.
When the slider 10 is placed on a plate and the motor 8 is activated, the slider 10 begins to move downward, and the sample suction tube 2 attached to the slider 10 descends. When the pump P is activated at this point, the suction tube 2 continues to descend while sucking in air until the tip reaches the sample solution.
It turns into air and continues to descend while sucking in the sample solution. When the slider 10 descends to a predetermined position, the protrusion 12 of the slider 10 activates the lower limit switch 7. As a result, the remote control circuit 13 outputs a signal to reverse the motor 8,
Raise the slider 10. As the sample suction tube 2 ascends while sucking the sample solution, the tip thereof is exposed in the air, and the sample suction tube 2 moves upward while sucking in air until it reaches the upper limit switch 6 . As a result, the motor 8 is reversed and the slider 10 is lowered. In this way, the tip of the sample suction tube 2 is moved back and forth between the solution and the air, so that the sample solution layer and the air layer are alternately moved through the pump P in the pipe system as shown in Figure 2. It gets sucked in. In this process, the air layer pulls out the residual sample from the previous analysis adhering to the pipe wall etc. to the inside of the pipe, and the sample solution layer that follows takes this protruding residual sample into it. carry it away. While repeating this process, the remaining sample is quickly discharged from the pipe system, and the measuring cell 11 contains no residual sample. -1 solution flows in, and the electrode potential reaches a steady state within a short time as shown in FIG. 3, completing the analysis for this sample.

In this embodiment, the mechanism for raising and lowering the sample suction tube was constructed using a screw punch and a slider, but a similar mechanism for raising and lowering the sample suction tube can also be achieved by using a cam mechanism.

[Example] A pipe with an inner diameter of 1 mm and a length of 180 mm is connected to the sample solution inlet side of the measurement cell, and the first sample solution is first poured into the pipe. 1 ↑ and Al11 constant cell number, this sample solution is deposited as residual sample = 1, and then the second sample solution (continuously deposited using the conventional method, i.e., the sample solution is deposited with a continuous sample solution) 1 and fed it to the measurement cell, the electrode "i[4;
The cell showed a 100% response for 10 seconds, at which time the solution was consumed. However, when the second sample solution and air were intermittently sucked once every second and the sump was pumped, the electrode potential was 11, &<
J showed 100% response in 7 seconds I■, and the sample solution consumption amount C was about 85 pl, making it possible to reduce sample solution consumption and analysis time.

As explained above, since the present invention is configured to alternately suck the sample solution and gas, the sample stuck to the inner wall of the pipe system and the sample remaining at the connection point can be discharged. This can be done quickly and efficiently, which not only reduces the time required for analysis by one car, but also reduces the number of samples required for analysis.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an apparatus showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram showing the state of a sample solution flowing through the conduit system of the same device, and FIG. 3 is an explanatory diagram showing the response characteristics of electrode potential according to the present invention and the conventional method. 1. Vertical mechanism 2. Sample solution suction tube 6. 7. Upper and lower limit switch 11. Measurement cell 13. Motor control circuit Applicant Shimadzu Corporation Representative Patent attorney Keiji Nishikawa Patent attorney Kimura Katsuhiko

Claims (1)

[Claims] In a sampling device equipped with a suction pump on one side of a measurement cell and a sample suction tube on the other side, sample 1 is used in which the tip of the suction tube is intermittently immersed in a sample solution.