System and method for rapidly measuring trace F <-> and Cl <-> in water based on chromatographic gradient elution

Abstract

The invention discloses a system and a method for rapidly measuring trace F <-> and Cl <-> in water based on chromatographic gradient elution. The system comprises a water storage tank, an anion trapper, an eluent generator, a six-way sample injection valve, a guard column, an analytical column, a suppressor, a conductivity detector and a chromatographic workstation, an outlet of the water storage tank is communicated with an inlet of the leacheate generator through the anion trapper, an outlet of the leacheate generator is communicated with an inlet of the guard column through the six-way sample injection valve, and an outlet of the guard column is communicated with the conductivity detector through the analytical column and the suppressor. The chromatographic work station is connected with the leacheate generator, the six-way sample injection valve, the suppressor and the conductivity detector, and the system and the method can realize rapid measurement of strongly corrosive anions F <-> and Cl <-> in water and rapid elution of other anions, so that the measurement time of each sample is reduced by at least 40% or more.

Description

Technical Field

[0001] The invention belongs to the technical field of water sample monitoring in power stations, and relates to a system and method for quickly measuring trace amounts of F- and Cl- in water based on chromatographic gradient elution. Background Art

[0002] The anion content of water vapor in power plants is an important corrosion monitoring indicator. The anion content in water vapor is trace. Currently, the measurement is generally done by taking samples back to the laboratory for ion chromatography offline measurement. Generally speaking, it takes nearly 30 minutes to measure a sample. The anion that power plants are most concerned about is the corrosive anion Cl - . Although chloride ions will peak in about 9-10 minutes, if the other anions (sulfate and phosphate) are not eluted from the chromatographic column, the next sample cannot be measured, resulting in a long measurement time for one sample, which is not conducive to rapid analysis and problem solving. The present invention proposes a rapid measurement system and method for trace F- and Cl- in water based on chromatographic gradient elution, which can complete the measurement of chloride ions in about 7 minutes and elute all anions on the chromatographic column within 15 minutes, so that fluoride ions and chloride ions can be quickly measured, water corrosion factors can be quickly diagnosed, and treatment suggestions can be given. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system and method for rapid measurement of trace F- and Cl- in water based on chromatographic gradient elution. The system and method can realize the rapid measurement of F- and Cl- in water. - 、Cl - Fast measurement.

[0004] In order to achieve the above object, the present invention discloses a method for detecting trace F in water based on chromatographic gradient elution. - 、Cl - Rapid measurement system, including water storage tank, anion trap, eluent generator, six-port injection valve, guard column, analytical column, suppressor, conductivity detector and chromatography workstation;

[0005] The outlet of the water storage tank is connected to the inlet of the eluent generator through the anion trap, the outlet of the eluent generator is connected to the inlet of the guard column through the six-way injection valve, the outlet of the guard column is connected to the conductivity detector through the analytical column and the suppressor, and the chromatography workstation controls the input and output signals of the eluent generator, the six-way injection valve, the suppressor and the conductivity detector.

[0006] Furthermore, the anode outlet of the eluent generator is connected to the cathode inlet of the eluent generator via a mixing liquid storage tank and a circulation pump.

[0007] Furthermore, the suppressor and the conductivity detector are integrated into a design.

[0008] Furthermore, the outlet of the water storage tank is connected to the inlet of the eluent generator via the anion trap and the high-pressure pump.

[0009] Furthermore, the chromatography workstation is connected to the high-pressure pump, the six-way injection valve, the eluent generator and the conductivity detector via wireless Wifi signals.

[0010] The present invention discloses a method for detecting trace F in water based on chromatographic gradient elution. - 、Cl - The rapid measurement method includes the following steps:

[0011] Control the current of the eluent generator;

[0012] The chromatographic workstation is used to control the eluent generator current at different time periods to obtain eluents of different concentrations, and a rapid gradient elution program is set, such as the measured current within 0-t1min is X1, the eluent concentration is Y1, and the measured current from t1min to t2min is X2, the eluent concentration is Y2.

[0013] The water from the water storage tank enters the eluent generator through the anion trap. The eluent generator current X1 is controlled to obtain the eluent with a concentration of Y1. After passing through the six-port injection valve, guard column, and analytical column, the eluent is removed by the suppressor to remove cations in the eluent. After that, it enters the conductivity detector to measure the conductivity signal. The discharge liquid of the conductivity detector passes through the cathode and anode of the suppressor and is discharged, completing the baseline elution of the chromatographic system.

[0014] The sample is injected through a six-port injection valve, which is then controlled to switch the flow path. A rapid gradient elution procedure is then performed after the sample enters the measurement system. After anions are removed from the water storage tank by an anion trap, the water enters the eluent generator through a high-pressure pump. The eluent generator current measured between 0 and t1 min is X1. Eluent with a concentration of Y1 is then drawn out through the six-port valve, passing through the guard column, analytical column, suppressor, and chromatographic conductivity sensor. During the measured period between t1 and t2 min, the eluent generator current becomes X2. Eluent with a concentration of Y2 is then passed through the six-port valve, guard column, analytical column, suppressor, and chromatographic conductivity sensor. Input and output signals from the high-pressure pump, eluent generator, six-port valve, suppressor, and chromatographic conductivity sensor are fed into the chromatographic workstation for signal control. The chromatographic peaks of individual anions are displayed on the workstation, and their concentrations are calculated.

[0015] Furthermore, it also includes:

[0016] Constructing a data model of the current-eluent concentration of the eluent generator;

[0017] The concentration of the eluent is determined according to the current of the eluent generator and using a data model of the current of the eluent generator and the eluent concentration.

[0018] Furthermore, it also includes:

[0019] Set the concentration Y1 of the eluent within 0-t1min to determine the trace amount of F in the guard column and analytical column. - 、Cl - The retention time is shortest and the separation effect is best; set the eluent Y2 concentration from t1min to t2min to ensure that CO3 2- 、SO4 2- Other anions have the shortest retention time and are eluted quickly.

[0020] Furthermore, the concentration Y of the eluent is:

[0021] Y=aX 5 -bX 4 +cX 3 -dX 2 +X

[0022] Where X is the current of the eluent generator and Y is the concentration of the generated eluent.

[0023] Furthermore, the anode of the eluent generator (4) is connected to the mixing liquid storage tank (11) and the cathode of the eluent generator (4) via a circulation pump (10).

[0024] The present invention has the following beneficial effects:

[0025] In the specific operation of the system and method for rapid measurement of trace F- and Cl- in water based on chromatographic gradient elution described in the present invention, high-purity water enters the eluent generator and eluent is generated online. Since the water passing through the pump head is high-purity water, problems such as corrosion, fouling and clogging of the pump head are avoided. In addition, the eluent generated online can prevent carbon dioxide from leaking into the air, rapidly reducing the background conductivity to 1 μS / cm. The present invention automatically controls and changes the working current of the eluent generator so that the chromatographic baseline can quickly reach a stable state. Through variable gradient elution, the chromatographic peak of chloride ions is completed in about 7 minutes, and the elution of all anions on the chromatographic column is completed in 15 minutes, avoiding the long measurement time (nearly 30 minutes) of each sample in conventional chromatographic analysis methods. Fluoride ions and chloride ions can be quickly measured, thereby quickly diagnosing water quality corrosion factors. This facilitates power plant operators to accurately judge water quality conditions through multiple indicators and timely process and guide water operating condition adjustments, ensuring safe and economical operation of thermal equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] Figure 1It is a structural schematic diagram of the present invention;

[0028] Figure 2 Schematic diagram of the data model of current-eluent concentration.

[0029] Among them, 1 is a water storage tank, 2 is an anion trap, 3 is a high-pressure pump, 4 is an eluent generator, 5 is a six-way injection valve, 6 is a guard column, 7 is an analytical column, 8 is a suppressor, 9 is a conductivity detector, 10 is a circulation pump, 11 is a mixing liquid storage tank, and 12 is a chromatography workstation. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it is to be understood that the terms “include” and “comprise” indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should be further understood that the term "and / or" as used in the present specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0034] It should be understood that although the terms "first," "second," and "third" may be used to describe preset ranges in embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are merely used to distinguish one preset range from another. For example, without departing from the scope of embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0035] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, 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.

[0038] Example 1

[0039] refer to Figure 1 The present invention is based on the chromatographic gradient elution of trace F in water - 、Cl - The rapid measurement system includes a water storage tank 1, an anion trap 2, a high-pressure pump 3, an eluent generator 4, a six-way injection valve 5, a guard column 6, an analytical column 7, a suppressor 8, a conductivity detector 9, a circulation pump 10, a mixing liquid storage tank 11 and a chromatography workstation 12;

[0040] The outlet of the water storage tank 1 is connected to the inlet of the eluent generator 4 through the anion trap 2 and the high-pressure pump 3. The outlet of the eluent generator 4 is connected to the inlet of the guard column 6 through the six-way injection valve 5. The outlet of the guard column 6 is connected to the conductivity detector 9 through the analytical column 7 and the suppressor 8. The chromatography workstation 12 is connected to the high-pressure pump 3, the eluent generator 4, the six-way injection valve 5, the suppressor 8 and the conductivity detector 9 for input and output signals via wireless Wifi.

[0041] The anode of the eluent generator 4 is connected to the mixing liquid storage tank 11 and the cathode of the eluent generator 4 via a circulation pump 10 .

[0042] In this embodiment, the suppressor 8 and the conductivity detector 9 are designed to be integrated, and no connector is required between the two, thereby reducing dead volume, interfaces and pipelines. The eluent enters the suppressor 8 to remove cations, reduce background conductivity, and then directly enters the conductivity detector 9 for measurement. The liquid output by the conductivity detector 9 is discharged after passing through the anode and cathode of the suppressor 8.

[0043] The high-pressure pump 3 brings high-purity water into the eluent generator 4, where the high-purity eluent (0-100) mmol / L is generated online and then enters the chromatographic analysis system; the chromatographic workstation 12 controls the current signal of the eluent generator 4 to prepare eluents of different concentrations online to achieve the gradient elution target, and isolates the leakage of air carbon dioxide, ensuring that the chromatographic baseline conductivity quickly drops below 1 μS / cm without using a nitrogen bottle.

[0044] Example 2

[0045] refer to Figure 1 and Figure 2 The method for rapid measurement of trace F- and Cl- in water based on chromatographic gradient elution of the present invention comprises the following steps:

[0046] 1) A data model of the current of the eluent generator 4 and the eluent concentration is constructed, and eluents of different concentrations are prepared by controlling the current of the eluent generator 4 .

[0047] Assuming the eluent concentration is Y and the current of the eluent generator 4 is X, we have:

[0048] Y=aX 5 -bX 4 +cX 3 -dX 2 +X

[0049] 2) Build a data model of eluent concentration-time under current mutation conditions. Due to the influence of system dead volume, the current change after gradient elution setting cannot immediately increase the eluent concentration. The lag time is t0, which needs to be considered in the gradient model setting.

[0050] 3) The water output from the water storage tank 1 passes through the anion trap 2 and then enters the eluent generator 4 through the high-pressure pump 3. The eluent generated online passes through the six-way injection valve 5 and then passes through the guard column 6, analytical column 7, suppressor 8 and conductivity detector 9 in sequence. The discharge liquid from the conductivity detector 9 passes through the cathode and anode of the suppressor 8 and is discharged.

[0051] According to the data model of the current-eluent concentration of the eluent generator 4, the current of the eluent generator 4 is adjusted to X1 through the chromatography workstation 12 to obtain the eluent concentration of Y1 until the baseline is stable and the conductivity is less than 1.0 μS / cm, and then sample analysis can be carried out.

[0052] 4) The sample is injected through the six-way injection valve 5, and the chromatography workstation 12 controls the six-way injection valve 5 to inject the sample water into the chromatography system.

[0053] 5) Chromatographic Analysis Step: The sample is injected through the six-way injection valve 5. The chromatographic workstation 12 controls the six-way injection valve 5 to switch the flow path, bringing the sample into the measurement system and executing the rapid gradient elution procedure. Water in the water storage tank 1 passes through the anion trap 2, where anions are removed. After entering the eluent generator 4 through the high-pressure pump 3, the water is measured as the current of the eluent generator 4 during the period 0-t1 min, which is X1. The eluent with a concentration of Y1 is then discharged through the six-way valve 5, passing through the guard column 6, the analytical column 7, the suppressor 8, and the chromatographic conductivity sensor 9. During the period t1 min-t2 min, the current of the eluent generator 4 becomes X2, and the eluent with a concentration of Y2 passes through the six-way valve 5, the guard column 6, the analytical column 7, the suppressor 8, and the chromatographic conductivity sensor 9. The input and output signals of the high-pressure pump 3, eluent generator 4, six-way valve 5, suppressor 8, chromatographic conductivity sensor 9, etc. enter the chromatographic workstation 12 for signal control, and the chromatographic peaks of each anion are displayed on the workstation and the concentration is calculated.

[0054] In this embodiment, the chromatography workstation 12 can be connected to the control signals of the high-pressure pump 3, the six-way injection valve 5, the eluent generator 4 and the conductivity detector 9 via wireless signals (wifi), and the chromatography workstation 12 controls the injection, gradient setting and chromatographic analysis.

[0055] The constructed data model of the current-eluent concentration of the eluent generator 4 is:

[0056] Y=aX 5 -bX 4 +cX 3 -dX 2 +X

[0057] After the sample enters the chromatographic system, the current of the eluent generator 4 is first adjusted to X1 through the chromatographic workstation 12 to obtain an eluent with a concentration of Y1. The sample is eluted under this concentration condition for t1min. Fluoride ions, formic acid, acetic acid and chloride ions appear at this stage and are well separated.

[0058] The chromatographic workstation 12 is used to adjust the current of the eluent generator 4 to X2 to obtain an eluent with a concentration of Y2, and elution is carried out under this concentration condition for t2min. Anions such as nitrate, sulfate, and carbonate peak at this stage, and only need to be eluted quickly without obtaining good separation.

[0059] According to the constructed data model of generator current-eluent concentration, several different currents and eluent concentrations were set. During the anion measurement process, the water negative peak was completed in about 3 minutes, and the F- and Cl- peak times were reduced by at least 2 minutes. Due to the rapid elution of other anions, the measurement time of each sample was reduced by at least 40%.

[0060] The division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0061] Example 3

[0062] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for rapid measurement of trace F- and Cl- in water based on chromatographic gradient elution are implemented. For example, the memory may include internal memory, such as a high-speed random access memory, and may also include non-volatile memory, such as at least one disk drive. The processor, network interface, and memory are interconnected via an internal bus, which may be an Industrial Standard Architecture bus, a Peripheral Component Interconnect Standard bus, an Extended Industrial Standard Architecture bus, etc. The bus may be classified as an address bus, a data bus, a control bus, etc. The memory is used to store the program. Specifically, the program may include program code, which includes computer operating instructions. The memory may include internal memory and non-volatile memory, and provides instructions and data to the processor.

[0063] Example 4

[0064] A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the method for rapidly measuring trace amounts of F- and Cl- in water based on chromatographic gradient elution. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0065] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0066] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0067] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0068] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1A step that specifies a function in one or more boxes.

[0069] Those skilled in the art will readily identify other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0070] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0071] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for the detection of trace F in water based on chromatographic gradient elution - 、Cl - Rapid measurement system, characterized in that It comprises a water storage tank (1), an anion trap (2), an eluent generator (4), a six-way injection valve (5), a guard column (6), an analytical column (7), a suppressor (8), a conductivity detector (9) and a chromatography workstation (12); The outlet of the water storage tank (1) is connected to the inlet of the eluent generator (4) via the anion trap (2), the outlet of the eluent generator (4) is connected to the inlet of the guard column (6) via the six-way injection valve (5), the outlet of the guard column (6) is connected to the conductivity detector (9) via the analytical column (7) and the suppressor (8), and the chromatographic workstation (12) controls the input and output signals of the eluent generator (4), the six-way injection valve (5), the suppressor (8) and the conductivity detector (9).

2. Trace F in water based on chromatographic gradient elution according to claim 1 - 、Cl - Rapid measurement system, characterized in that The circulating water outlet of the eluent generator (4) is connected to the anode inlet and cathode outlet of the eluent generator (4) via the mixing liquid storage tank (11) and the circulating pump (10). The circulating pump (10) sequentially enters the anode and cathode of the eluent generator (4) and then returns to the mixing liquid storage tank (11).

3. Trace F in water based on chromatographic gradient elution according to claim 1 - 、Cl - Rapid measurement system, characterized in that The suppressor (8) and the conductivity detector (9) are designed as an integrated whole.

4. Trace F in water based on chromatographic gradient elution according to claim 1 - 、Cl - Rapid measurement system, characterized in that The outlet of the water storage tank (1) is connected to the inlet of the eluent generator (4) through the anion trap (2) and the high-pressure pump (3). The high-pressure pump (3) brings high-purity water into the inlet of the eluent generator (4). The chromatography workstation (12) produces eluents of different concentrations online by controlling the current signal of the eluent generator (4).

5. Trace F in water based on chromatographic gradient elution according to claim 4 - 、Cl - Rapid measurement system, characterized in that The chromatographic workstation (12) is connected to the high-pressure pump (3), the six-way injection valve (5), the eluent generator (4) and the conductivity detector (9) via wireless signals.

6. A method for the determination of trace F in water based on chromatographic gradient elution - 、Cl - The rapid measurement method is characterized in that Based on the trace F in water based on chromatographic gradient elution according to claim 1 - 、Cl - The rapid measurement system includes the following steps: The current of the eluent generator (4) at different time periods is controlled by the chromatography workstation (12) to obtain eluents of different concentrations, and a rapid gradient elution program is set, such as the current measured from 0 to t1 min is X1, the eluent concentration is Y1, and the current measured from t1 min to t2 min is X2, the eluent concentration is Y2; The water output from the water storage tank (1) passes through the anion trap (2) and then enters the eluent generator (4). The chromatographic workstation (12) controls the current X1 of the eluent generator (4) to obtain an eluent with a concentration of Y1. The eluent passes through the six-way injection valve (5) and then sequentially passes through the guard column (6) and the analytical column (7) to elute the column system. The cations in the eluent are removed by the suppressor (8). Finally, the conductivity signal is measured by the conductivity detector (9). The discharge liquid of the conductivity detector (9) passes through the cathode and anode of the suppressor (8) and is discharged, completing the baseline elution of the chromatographic system. The sample is injected through the six-way injection valve (5), and the chromatographic workstation (12) controls the six-way injection valve (5) to switch the flow path. After the sample is brought into the measurement system, a rapid gradient elution program is performed. The water in the water storage tank (1) passes through the anion trap (2), removes anions, and then enters the eluent generator (4) through the high-pressure pump (3). The measured current of the eluent generator (4) within 0-t1min is X1. The eluent with a concentration of Y1 is taken out through the six-way valve (5), and passes through the guard column (6), analytical column (7), suppressor (8) and Chromatographic conductivity sensor (9); the current of the eluent generator (4) during the measured t1min-t2min is changed to X2, and the eluent with a concentration of Y2 is obtained. The input and output signals of the high-pressure pump (3), eluent generator (4), six-way valve (5), suppressor (8), chromatographic conductivity sensor (9), etc. enter the chromatographic workstation (12) for signal control, and the chromatographic peaks of each anion are displayed on the workstation and the concentration is calculated.

7. Trace F in water based on chromatographic gradient elution according to claim 6 - 、Cl - The rapid measurement method is characterized in that Also includes: Constructing a data model of the current-eluent concentration of the eluent generator (4); According to the current of the eluent generator (4), the concentration of the eluent is set using a data model of the current of the eluent generator (4) and the eluent concentration.

8. Trace F in water based on chromatographic gradient elution according to claim 7 - 、Cl - The rapid measurement method is characterized in that Also includes: Set the concentration Y1 of the eluent within 0-t1min to determine the trace amount of F in the guard column (6) and analytical column (7). - 、Cl - The retention time is shortest and the separation effect is best; set the eluent Y2 concentration from t1min to t2min to ensure that CO3 2- 、SO4 2- Other anions have the shortest retention time and are eluted quickly.

9. Trace F in water based on chromatographic gradient elution according to claim 8 - 、Cl - The rapid measurement method is characterized in that Gradient elution is based on the current-eluent concentration data model: Y=aX 5 -bX 4 +cX 3 -dX 2 +X Wherein, X is the current of the eluent generator (4), and Y is the concentration of the generated eluent.

10. Trace F in water based on chromatographic gradient elution according to claim 8 - 、Cl - The rapid measurement method is characterized in that The anode of the eluent generator (4) is connected to the mixed liquid storage tank (11) and the cathode of the eluent generator (4) via a circulation pump (10).

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