JPH0149902B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has been made to provide a flow liquid type analyzer with a fast response speed. The present invention relates to a flow-type analyzer having a detector for the flow-type analyzer, characterized in that the flow-type analyzer is provided with a pump mechanism that operates to repeatedly switch the liquid feeding direction between the forward direction and the reverse direction. be.

In conventional flow-type analyzers, the solution is fed in only one direction, which slows the change of liquid in the liquid reservoir in the flow tube, and also reduces the effect of stirring the solution in the detection part of the detector. Unfortunately, it was not possible to increase the response speed beyond a certain level.

The present invention eliminates the drawbacks of the above-mentioned conventional methods and also exhibits significant additional effects.

The present invention will be described in detail below with reference to drawings of examples, but the invention is not limited to the following examples.

What is shown in FIG. 1 is a flow-type analyzer 1 that uses an ion electrode in the detector section, including a standard solution bottle 2, a pump 3, a sample supply section 4, a detector 5,
A waste liquid bottle 6 is connected via a solution flow pipe 7.

This analysis step will be explained in sequence below.

As shown in FIG. 1, the sample is supplied by connecting the flow path switching pot 8 with the solution distribution tube 7 from the sample supply section 4 and the solution distribution tube 7 from the detector 5. In this state, the switching valve 9 is connected to the air direction. Next, set the flow path switching pot 8 so that the solution flow pipe 7 from the standard solution bottle 2 and the solution flow pipe 7 from the detector 5 are connected so that the liquid flow direction is in the forward direction (as indicated by the solid arrow in the figure). The pump 3 is operated so that the solution reaches the waste solution bolt 6 as shown, and the sample and the air to be separated from the standard solution are sent to the detector 5. Next, the switching valve 9 is connected to the standard solution bottle 2 while keeping the flow path switching pot 8 and the pump in the same operating state. reach. Then, when the sample and the standard solution pass through the ion electrode 10 and the reference electrode 11, which are the detection part of the detector 5, the potential difference between the sample and the standard solution is measured, and the potential difference between the sample and the standard solution is compared. Find the concentration of When the sample and standard solution pass through the detector 5 section, the pump 3 operates to repeatedly switch the liquid feeding direction between the forward direction and the reverse direction (indicated by the dotted arrow in the figure) according to a command from the pump controller 12. .

The pump mechanism that operates to repeatedly switch the liquid feeding direction between the forward direction and the reverse direction is composed of a pump 3 and a pump controller 12 that sends commands to the pump 3, as shown in the above embodiment. 12 may of course be incorporated into the pump 3.

After the liquid is fed in the forward direction for t ₁ hour, the liquid is fed in the reverse direction for t ₂ hours, and this is repeated sequentially. By feeding the liquid in the relationship t ₁ > t ₂ , The sample and standard solution automatically reach the waste bottle, and if the liquid is sent in this way, there is no need to send the sample and standard solution in the forward direction after detection to reach the waste bottle. . In the graph of Figure 2, the solid line shows the relationship between time and the integral amount of fluid flowing in the positive direction under the above condition t ₁ > t ₂ , and the dotted line shows the relationship between the time and the integral amount of fluid flowing in the positive direction under the condition of t 1 > t 2. Shown is the case where the liquid was sent only to the

In addition, although the example shows a configuration in which the standard solution is passed through the detector at the same time as the sample, it is of course also possible to obtain data on the standard solution through a separate detector and to pass only the sample. It is.

This invention is configured as described above. According to this invention, the liquid feeding direction is repeatedly switched between forward and reverse, so that the liquid can be replaced smoothly in the liquid reservoir, and further, the detector The agitation effect of the solution in the detection part is excellent, and therefore the liquid on the surface of the detection part is replaced quickly, the detection part and the solution become compatible, and the overall response speed is extremely fast. FIG. 3 is an enlarged view of the electrode part, which is the detection part used to clarify the above effect. In other words, when the liquid feeding direction is one direction indicated by the arrow, a stagnation part is created in part a, and therefore the liquid is In the present invention, since the liquid feeding direction is changed, the vicinity of the electrode part is easily stirred.

Furthermore, according to the present invention, since the detection part is in contact with a fixed volume of solution for a long time, there is also the advantage that a smaller volume of sample is required compared to the conventional method when analysis is performed over the same period of time.

In addition, when cleaning, if the cleaning liquid is fed by a pump in the same way as the sample, by switching the liquid feeding direction forward and backward repeatedly, this has the additional effect of cleaning the inside of the flow pipe, such as the detector part, cleanly in a short time. .

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a glass showing the integral amount of fluid flowing in the positive direction of the solution with respect to time for this invention and a conventional product, Fig. 3 is an enlarged explanation of the main parts of this invention. FIG. 1... Flow liquid analyzer, 2... Standard solution bottle, 3... Pump, 4... Sample supply section, 5... Detector.

Claims (1)

[Claims] 1 In a flow liquid analyzer that has a pump for feeding a solution and a detector for measuring the concentration or composition of the solution, a pump mechanism that operates to repeatedly switch the liquid feeding direction between the forward direction and the reverse direction. A flow liquid type analyzer characterized by being provided with.