Online conductivity detection device for ion chromatography conductivity detector

Abstract

The utility model discloses an ion chromatography conductivity detector's conductivity on-line detection device, including constant temperature standard sample chamber, N-way selector valve, spare liquid ring and injection pump, wherein the constant temperature standard sample chamber is provided with N-2 standard sample bottle, all standard sample bottle and N-2 opening on the N-way selector valve one-to-one correspondence, an outlet of each standard sample bottle is communicated with a corresponding opening in the N-way selector valve, the Nth opening of the N-way selector valve is used as an empty interface, the (N-1) th opening of the N-way selector valve is communicated with a conductivity detector, the common end of the N-way selector valve is communicated with the E end of the injection pump through the liquid preparation ring, and the device is high in conductivity measurement accuracy.

Description

Technical Field

[0001] The utility model belongs to the technical field of analysis and detection, and relates to an online detection device for the conductivity of an ion chromatography conductivity detector. Background Art

[0002] With the acceleration of industrialization and urbanization, water pollution is becoming increasingly serious, posing a huge threat to human health and the ecological environment. This has become a focus of attention from all walks of life, so water environment monitoring is necessary. At this time, ion chromatography technology has emerged. As an efficient and sensitive analytical method, this technology has significant advantages in water environment testing, soil environment testing, atmospheric environment testing, and other tasks in environmental testing, and has demonstrated an irreplaceable role in environmental quality monitoring. At this stage, ion detection technology has been vigorously promoted and widely used in the field of environmental testing and governance. In-depth research on its application methods and key points has strong practical significance.

[0003] The ion chromatograph mainly consists of an eluent system, a detection system, a chromatographic pump system, an injection system, a flow system, a separation system, a chemical suppression system, and a data processing system. The core unit of ion chromatography, the detection system, uses the electrical conductivity of ions in aqueous solution (i.e., conductivity) to detect ion concentration. In actual testing, we often encounter samples with excessively high conductivity, especially those with severe pollution and high ion concentrations such as sewage and surface water. If the sample is directly injected, the chromatographic column will be overloaded, which will greatly affect the sensitivity of the test. Therefore, the accuracy of conductivity detection is crucial. At present, the design of conductivity values ​​in domestic instruments is mostly virtual signals, and there is no effective way to control the accuracy of conductivity measurements. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide an ion chromatography conductivity detector conductivity online detection device, which has high accuracy in measuring conductivity.

[0005] To achieve the above-mentioned purpose, the utility model discloses an online conductivity detection device of an ion chromatography conductivity detector, comprising a constant temperature standard sample chamber, an N-way selection valve, a liquid preparation ring and a syringe pump, wherein N-2 standard sample bottles are arranged in the constant temperature standard sample chamber, each standard sample bottle corresponds one-to-one to the N-2 openings on the N-way selection valve, the outlet of each standard sample bottle is connected to the corresponding opening in the N-way selection valve, the Nth opening of the N-way selection valve serves as an empty interface, the N-1th opening of the N-way selection valve is connected to a conductivity detector, and the common end of the N-way selection valve is connected to the E end of the syringe pump via the liquid preparation ring.

[0006] It also includes a temperature control module. The constant temperature standard sample room is provided with a heating module, a Peltier cooling module and a temperature sensor. The heating module, the Peltier cooling module and the temperature sensor are connected to the temperature control module.

[0007] The volume of the liquid preparation ring is greater than the full scale volume of the injection pump.

[0008] The I end of the injection pump is connected to an ultrapure water input pipeline.

[0009] The ultrapure water input pipeline is provided with a control valve.

[0010] The outlet of the standard sample bottle is connected to the corresponding opening in the N-way selection valve through an injection pipeline.

[0011] The sampling pipeline is provided with a sampling valve.

[0012] The ultrapure water input pipeline is connected to an ultrapure water storage tank.

[0013] N=10.

[0014] The utility model has the following beneficial effects:

[0015] During specific operation, the online conductivity detection device of the ion chromatography conductivity detector described in the utility model is as follows: the empty interface of the N-way selection valve is connected, and the syringe pump performs micro-pumping of liquid through the E end thereof, thereby forming an isolation bubble in the reserve liquid ring; then the empty interface of the N-way selection valve is closed, and the opening corresponding to the standard sample bottle containing the solution to be measured on the N-way selection valve is connected, and then the syringe pump is used to draw the solution to be measured into the reserve liquid ring; then, the solution to be measured in the reserve liquid ring is injected into the conductivity detector by the syringe pump for detection. Thus, by providing the N-way selection valve and the reserve liquid ring, the solution is prevented from directly entering the conductivity detector, thereby improving the accuracy of conductivity measurement and providing an effective countermeasure for ion chromatography conductivity value traceability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Among them, 1 is the constant temperature standard sample chamber, 2 is the injection pump, 3 is the N-way selection valve, and 4 is the liquid preparation ring. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0019] The accompanying drawings illustrate schematic diagrams of the structures of the disclosed embodiments of the present invention. These figures are not drawn to scale; for the sake of clarity, some details are exaggerated and some details may be omitted. The shapes, relative sizes, and positional relationships of the various regions and layers shown in the figures are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0020] refer to Figure 1 The ion chromatography conductivity detector conductivity online detection device described in the utility model includes a constant temperature standard sample chamber 1, an N-way selection valve 3, a preparation liquid ring 4 and a syringe pump 2, wherein N-2 standard sample bottles are arranged in the constant temperature standard sample chamber 1, each standard sample bottle corresponds to the N-2 openings on the N-way selection valve 3 one by one, and the outlet of each standard sample bottle is connected to the corresponding opening in the N-way selection valve 3. The Nth opening of the N-way selection valve 3 serves as an empty interface, and the N-1th opening of the N-way selection valve 3 is connected to the conductivity detector. The common end of the N-way selection valve 3 is connected to the E end of the syringe pump 2 via the preparation liquid ring 4, and the I end of the syringe pump 2 is connected to the ultrapure water input pipeline.

[0021] Preferably, N=10.

[0022] Preferably, the constant temperature standard sample chamber 1 is provided with a heating module, a Peltier cooling module and a temperature sensor, which are connected to the temperature control module to realize heating and cooling functions, with a temperature control accuracy of ±0.1°C.

[0023] Preferably, the volume of the liquid reserve ring 4 is greater than the full-scale volume of the injection pump 2 .

[0024] Preferably, a control valve is provided on the ultrapure water input pipeline.

[0025] Preferably, the ultrapure water input pipe is connected to an ultrapure water storage tank, the outlet of the standard sample bottle is connected to the corresponding opening in the N-way selection valve 3 through an injection pipe, and the injection pipe is provided with an injection valve.

[0026] The working process of the ion chromatography conductivity detector conductivity online detection device of the utility model is:

[0027] 1) Connect the empty port of the N-way selector valve 3, connect the I end of the syringe pump 2 to the pure water input pipe, and draw pure water through the syringe pump 2. Then, inject the pure water into the liquid preparation ring 4 through the E end of the syringe pump 2. Repeat the above steps until pure water flows out of the empty port;

[0028] 2) The empty port of the N-way selector valve 3 is connected, and the syringe pump 2 performs micro-pumping through its E end, thereby forming isolated bubbles in the liquid preparation ring 4;

[0029] 3) Close the empty port of the N-way selector valve 3, open the opening on the N-way selector valve 3 corresponding to the standard sample bottle containing the solution to be measured, and then use the syringe pump 2 to draw the solution to be measured into the preparation liquid ring 4. At the same time, the pure water in the preparation liquid ring 4 is separated from the solution to be measured by the isolation bubble;

[0030] 4) The N-1th opening on the N-way selector valve 3 is opened, that is, the N-1th opening of the N-way selector valve 3 is connected to the conductivity detector, and then the solution to be measured in the preparation liquid ring 4 is injected into the conductivity detector through the syringe pump 2 for detection.

[0031] Table 1

[0032]

[0033] Using the above procedure, with the calibration device flow rate adjusted to 1.0 mL / min, conductivity tests were conducted on ion chromatograph conductivity detectors from three manufacturers. The data are shown in Table 1. Calculations from the results in Table 1 indicate that the conductivity values ​​of all three devices are low. While manufacturer 3 achieved the best conductivity value, the error reached approximately -8%. To ensure the accuracy of the ion chromatograph output, the device's circuit board was debugged. The results after these adjustments are shown in Table 2.

[0034] Table 2

[0035]

[0036] As shown in the results in Table 2, through adjustment, the relative error of conductivity is greatly reduced, the accuracy of the indication is greatly improved, and the accuracy of the actual signal output of the ion chromatograph is ensured.

[0037] The utility model can effectively measure the conductivity value, and the error between the conductivity measurement value and the true value can be found by introducing a standard conductivity solution. The error can be reduced by adjusting the circuit, thereby improving the measurement accuracy.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An ion chromatography conductivity detector conductivity online detection device, characterized in that, The invention comprises a constant temperature standard sample chamber (1), an N-way selection valve (3), a liquid preparation ring (4) and an injection pump (2), wherein N-2 standard sample bottles are arranged in the constant temperature standard sample chamber (1), each standard sample bottle corresponds to the N-2 openings on the N-way selection valve (3) one by one, the outlet of each standard sample bottle is connected to the corresponding opening in the N-way selection valve (3), the Nth opening of the N-way selection valve (3) serves as an empty interface, the N-1th opening of the N-way selection valve (3) is connected to a conductivity detector, and the common end of the N-way selection valve (3) is connected to the E end of the injection pump (2) via the liquid preparation ring (4).

2. The ion chromatography conductivity detector conductivity online detection device according to claim 1, characterized in that: It also includes a temperature control module. The constant temperature standard sample chamber (1) is provided with a heating module, a Peltier cooling module and a temperature sensor. The heating module, the Peltier cooling module and the temperature sensor are connected to the temperature control module.

3. The ion chromatography conductivity detector conductivity online detection device according to claim 1, characterized in that: The volume of the liquid preparation ring (4) is greater than the full-scale volume of the injection pump (2).

4. The ion chromatography conductivity detector conductivity online detection device according to claim 1, characterized in that: The I end of the injection pump (2) is connected to an ultrapure water input pipeline.

5. The ion chromatography conductivity detector conductivity online detection device according to claim 4, characterized in that: The ultrapure water input pipeline is provided with a control valve.

6. The ion chromatography conductivity detector conductivity online detection device according to claim 1, characterized in that: The outlet of the standard sample bottle is connected to the corresponding opening in the N-way selection valve (3) through a sampling pipeline.

7. The ion chromatography conductivity detector conductivity online detection device according to claim 6, characterized in that: The sampling pipeline is provided with a sampling valve.

8. The ion chromatography conductivity detector conductivity online detection device according to claim 4, characterized in that: The ultrapure water input pipeline is connected to an ultrapure water storage tank.

9. The ion chromatography conductivity detector conductivity online detection device according to claim 1, characterized in that: N＝10。

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