JP4549152B2 - Pretreatment equipment for chemical analysis - Google Patents

Description

  The present invention relates to a pretreatment apparatus for chemical analysis, and more particularly to a pretreatment apparatus for chemical analysis that efficiently removes an analysis interfering component in chemical analysis such as ion chromatography analysis.

  In water such as cooling water used in a power plant, ammonia and hydrazine are usually added at a high concentration of, for example, 10 to 20 ppm for water quality adjustment. Recently, ethanolamine is often used instead of hydrazine because hydrazine is carcinogenic.

  In the power plant, the trace components in the water are analyzed for the purpose of water quality management as described above. This analysis includes manual analysis and automatic analysis using industrial instruments. In automatic analysis, ion analysis is performed using a conductivity analyzer that measures the conductivity of water that fluctuates when the concentration of trace components changes, and ion chromatography. An on-line ion chromatograph or the like that continuously measures the above is used.

  In the analysis by the online ion chromatograph, for example, cations such as Na, Mg, Ca and K ions are ions to be analyzed. Since ammonia and ethanolamine added to water as described above also generate cations, if they are present in a high concentration in the sample water, a huge peak based on the cations generated therefrom will appear on the chromatogram. May appear, making measurement of the analyte ion difficult. Therefore, such sample water cannot be used in an on-line ion chromatograph as it is, and it is necessary to perform a pretreatment to eliminate the influence of an analysis interfering component before analysis.

  In the water quality management analysis at the power plant, it is necessary to immediately feed back the analysis results to the operation of the power plant, and if the analysis is not performed immediately after collecting the sample water, the analysis accuracy will be reduced. Can't spend time on pre-processing.

  Under such circumstances, in the analysis by the conventional on-line ion chromatography apparatus, means for adjusting the method of concentrating the sample water has been adopted as means for eliminating the influence of analysis interference components such as ammonia. That is, in the concentration of sample water using ion exchange resin, etc., the concentration of the interfering substance remaining in the sample water is reduced, the peak based on the interfering substance is reduced, and the peak of the analyte ion can be measured. I was trying to be.

  However, in this conventional method, since the interfering substance is still present in a considerable amount in the sample water, it is impossible to analyze the analysis target ion with high accuracy, and the original purpose of the water quality management analysis in the power plant is achieved. It was difficult.

  The present invention has been made to eliminate such disadvantages in chemical analysis such as ion chromatography analysis. That is, an object of the present invention is to provide a chemical analysis pretreatment apparatus capable of removing an analysis interfering component in chemical analysis to such an extent that the analysis of ions to be analyzed can be performed with high accuracy. Is to provide.

The present invention for achieving the above object is a pretreatment device for chemical analysis which is a pretreatment device for ion chromatographic analysis , and comprises an outer tube, a photocatalyst portion housed in the outer tube, and housed in the outer tube. A photocatalytic reaction decomposing means capable of decomposing an analysis interfering component contained in water used in a power plant by a photocatalytic reaction, and a decomposition obtained by the photocatalytic reaction decomposing means can be supplied with treated water, and characterized in that it comprises and a vaporization removal means for the volatile analyzes interference component contained in the decomposition treated water supplied can be evaporated off A pretreatment device for chemical analysis,
As a preferred embodiment of the chemical analysis for the pretreatment device, a first flow passage capable of supplying the water used in the power plant prior Symbol photocatalytic decomposition reaction unit, the decomposition obtained by the photocatalytic decomposition reaction unit A second flow path capable of sending treated water to the evaporative removal means,
Comprising detour flow path forming means capable of sending water used in the power plant flowing through the first flow path to the evaporative removal means without flowing to the photocatalytic reaction decomposition means,
The detour channel forming means extends from the first three-way switching valve provided in the first channel, the second three-way switching valve provided in the second channel, and the first three-way switching valve, 2 with a bypass flow path leading to the three-way switching valve,
The evaporation removal means by heating the decomposition treated water, degassed heating means volatile component contained in the decomposition treated water can be evaporated and removed, the degradation treated water And degassing means capable of evaporating and removing volatile components contained in the decomposed water ,
The photocatalytic reaction decomposition means has titanium dioxide as a photocatalyst.

  The pretreatment apparatus for chemical analysis according to the present invention has the photocatalytic reaction decomposition means and the evaporation removal means, so that it is possible to effectively remove the analysis disturbing component. That is, the chemical analysis pretreatment apparatus according to the present invention cannot be removed only by the evaporation removal process, but needs to be decomposed by the photocatalytic reaction, and the analysis disturbance component that can be removed only by the evaporation removal process. Both can be removed.

  The pretreatment apparatus for chemical analysis according to the present invention is provided with a bypass flow path forming means, and passes the sample through the photocatalytic reaction decomposing means when the sample does not contain an analysis interfering component that needs to be decomposed by the photocatalytic reaction. Directly into the heating means. That is, the pretreatment device for chemical analysis according to the present invention is for both a sample containing an analysis interfering component that needs to be decomposed by a photocatalytic reaction and a sample that does not contain an analytical interfering component that needs to be decomposed by a photocatalytic reaction. Can be preferably used.

  This also enables the chemical analysis pretreatment apparatus according to the present invention to enable rapid and efficient pretreatment of the sample, and to reduce the burden on the photocatalytic reaction decomposition means, It is possible to extend the lifetime.

FIG. 1 is a conceptual diagram of a pretreatment device 1 for ion chromatography analysis, which is a specific example of the pretreatment device for chemical analysis according to the present invention. In the following, “water” that is a treatment target of the chemical analysis pretreatment apparatus according to the present invention may be referred to as “sample” or “sample water”.

  The pretreatment device 1 for ion chromatography analysis includes a pump 2, a photocatalytic reaction decomposition means 3, a heating device 4, a deaeration device 5, a first flow path 6, a second flow path 7, and a third flow path. 8, a first three-way switching valve 9, a second three-way switching valve 10, and a bypass flow path 11.

  The first channel 6 is a sample supply channel and is a channel for supplying the sample to the photocatalytic reaction decomposition means 3. One end of the first flow path 6 is coupled to the photocatalytic reaction decomposing means 3, and the other end is coupled to, for example, a tank for storing a sample. The pump 2 is provided in the first flow path 6 and can send a sample to the first flow path 6 at a predetermined flow rate.

  The photocatalytic reaction decomposing means 3 is an apparatus that can receive a sample sent through the first flow path 6 and decompose an analysis interfering component contained in the sample by a photocatalytic reaction. The sample supplied to the photocatalytic reaction decomposing means 3 is subjected to a photocatalytic reaction by the photocatalytic reaction decomposing means 3 and becomes a decomposed sample.

  The photocatalytic reaction decomposing means 3 includes a photocatalyst capable of decomposing an analysis interfering component contained in a sample. The photocatalyst is not particularly limited as long as the target analysis interfering component can be suitably decomposed. For example, when the analysis interfering component is ethanolamine, titanium dioxide can be used.

FIG. 2 is a partial longitudinal sectional view of the photocatalytic reaction decomposition means 3. The photocatalytic reaction decomposing means 3 includes an outer tube 16, a photocatalytic unit 17, and an ultraviolet irradiation unit 18.
The outer tube 16 is a member that forms the outer shell of the photocatalytic reaction decomposition means 3.

The photocatalyst portion 17 is a linear body having a U-shape, and is accommodated in the outer tube 16 so that both end straight portions formed in parallel are parallel to the peripheral surface of the outer tube 16. . The photocatalyst portion 17 includes a tubular body formed in a tubular shape, and a photocatalyst film formed on the surface thereof. The photocatalyst film in the photocatalyst part 17 can be manufactured by, for example, a sol-gel method. When titanium dioxide is used as the photocatalyst, the photocatalytic coating can be prepared by the sol-gel method, for example, as follows. Disperse titanium dioxide in a solvent such as tetrabutoxide to prepare a titanium dioxide dispersion having a concentration of 3 to 6%, apply this to a tubular body such as SiO ₂ , and after drying, for example, at 500 ° C. Sinter.

  The ultraviolet irradiation unit 18 is accommodated in the outer tube 16, and is disposed between both ends of the photocatalyst unit 17 so as to be parallel to them. The ultraviolet irradiation unit 18 irradiates ultraviolet rays necessary for the photocatalytic reaction. As the ultraviolet irradiation unit 18, a known ultraviolet irradiation unit that can irradiate ultraviolet rays necessary for the photocatalytic reaction, for example, an ultraviolet lamp can be used.

  The structure of the photocatalytic reaction decomposing means according to the present invention is not limited to the structure shown in FIG. 2, and any analysis disturbing component contained in the sample can be continuously decomposed by the photocatalyst. Such a structure may be used.

  The second flow path 7 is a flow path connecting the photocatalytic reaction decomposing means 3 and the heating means 4, and the decomposition-treated sample generated by the photocatalytic reaction decomposing means 3 can be supplied to the heating means 4. Therefore, the second flow path 7 can function as a decomposed sample supply flow path.

  The first three-way switching valve 9 is provided in the first flow path 6. Accordingly, the first flow path 6 includes a first flow path first half 12 extending from the first three-way switching valve 9 to the pump 2 side, and a first flow path second half extending from the first three-way switching valve 9 to the photocatalytic reaction decomposition means 3 side. It can be divided into 13.

  The second three-way switching valve 10 is provided in the second flow path 7. Accordingly, the second flow path 7 includes a second flow path first half portion 14 extending from the second three-way switching valve 10 to the photocatalytic reaction decomposition means 3 side, and a second flow path second half extending from the second three-way switch valve 10 to the heating means 4 side. It can be divided into part 15.

  The bypass flow path 11 is a flow path connecting the first three-way switching valve 9 and the second three-way switching valve 10.

  Therefore, the first three-way switching valve 9 circulates the fluid that has reached the first three-way switching valve 9 through the first channel first half 12 to either the first channel second half 13 or the bypass channel 11. Can be made. The second three-way switching valve 10 is either a fluid that has reached the second three-way switching valve 10 through the first half 13 of the second flow path or a fluid that has reached the second three-way switching valve 10 through the bypass flow path 11. One of them can be circulated through the second flow path rear half 15.

  As described above, the first three-way switching valve 9, the second three-way switching valve 10, and the bypass flow path 11 form a bypass formation unit.

  The detour formation means according to the present invention is such that, as long as the liquid sample flowing through the sample supply channel can be sent to the evaporation removing means without flowing through the photocatalytic reaction decomposition means, the detour as described above is used. There is no limitation to the path forming means.

  The heating means 4 is a device that can heat-treat the fluid supplied through the second flow path rear half 15 and continuously evaporate and remove volatile components contained in the fluid. Since the heating means 4 communicates with the photocatalytic reaction decomposing means 3 through the second flow path 7, it is possible to receive the decomposed sample generated by the photocatalytic reaction decomposing means 3 and heat it. Further, since the heating means 4 communicates with the first flow path first half 12 by the bypass flow path 11 and the second flow path second half part 15, the sample that has not been processed by the photocatalytic reaction decomposition means 3 is received and subjected to heat treatment. You can also The fluid supplied to the heating means 4 is heat-treated as described above by the heating means 4 to become a heat-treated sample.

  The heating unit 4 is not particularly limited as long as it has the above function, and for example, a known heating unit can be used.

  The third channel 8 is a channel connecting the heating unit 4 and the degassing unit 5, and the heat-treated sample generated by the heating unit 4 can be supplied to the degassing unit 5. Accordingly, the third flow path 8 functions as a heat-treated sample supply flow path.

  The deaeration means 5 is an apparatus that can degas the heat-treated sample supplied through the third flow path 8 and continuously evaporate and remove volatile components contained in the fluid. . The heat-treated sample supplied to the degassing means 5 is heat-treated as described above to become a pre-treated sample.

  The deaeration unit 5 is not particularly limited as long as it has the above function, and for example, a known deaeration unit can be used.

  Thus, the heating means 4 and the deaeration means 5 form a heating removal means.

  The pretreatment device 1 for ion chromatography analysis operates as follows by having the above configuration.

  First, the sample cannot be removed only by heat treatment and degassing treatment, but it must be decomposed by photocatalytic reaction, and volatile analysis interference that can be removed only by heat treatment and degassing treatment. The case where the component is contained will be described.

  The first three-way valve 9 enables flow from the first flow path front half 12 to the first flow path rear half 13 and disables flow from the first flow path first half 12 to the detour flow path 11. The second three-way valve 10 is adjusted to enable the flow from the second flow path front half 14 to the second flow path rear half 15 and disable the flow from the bypass flow path 11 to the second flow path rear half 15. (This state is hereinafter referred to as “the state through the photocatalytic reaction decomposition means”).

  The sample is supplied to the photocatalytic reaction decomposing means 3 through the first channel first half 12 and the first channel second half 13 by the action of the pump 2. The sample supplied to the photocatalytic reaction decomposing means 3 passes through the outer tube 16 while being in contact with the photocatalytic portion 17. In the meantime, the component to be decomposed in the sample is decomposed by receiving the action of the photocatalyst of the photocatalyst part 17 while receiving the ultraviolet ray irradiated from the ultraviolet ray irradiating part 18 and causing a photocatalytic reaction. As a result, the photocatalytic reaction decomposing means 3 decomposes the analysis interfering component that needs to be decomposed by the photocatalytic reaction contained in the sample. Then, a photocatalyst-treated sample containing a decomposition product generated by decomposition of the analysis interfering component is obtained.

  The photocatalyst-treated sample is supplied to the heating means 4 through the second flow path first half 14 and the second flow path second half 15. The photocatalyst-reacted sample supplied to the heating unit 4 is heat-treated by the heating unit 4, and the volatile analysis interfering component contained in the photocatalyst-reacted sample is removed by evaporation. When the decomposition product contained in the photocatalyzed reaction-treated sample is volatile, the decomposition product is also evaporated and removed by the heating means 4. As a result, a heating-treated sample produced by evaporating and removing volatile components from the photocatalytic reaction-treated sample is obtained by the heating means 4.

  The heat-treated sample is supplied to the deaeration means 5 through the third flow path 8. The heat-treated sample supplied to the degassing means 5 is degassed by the degassing means 5, and volatile analysis interfering components contained in the heat-treated sample are removed by evaporation. The volatile decomposition products are similarly removed by evaporation. This makes it possible to remove the volatile analysis interfering component that cannot be removed even by the heat treatment of the heating means 4 and still remains in the heat-treated sample. As a result, the degassing means 5 provides a pretreated sample generated by evaporating and removing volatile components from the heat-treated sample.

  As described above, the analysis interfering component that needs to be decomposed by the photocatalytic reaction in the sample is decomposed, and the volatile analysis interfering component is evaporated and removed. When the decomposition product generated by the photocatalytic reaction is volatile, the decomposition product is also removed by evaporation. That is, the pretreatment device for ion chromatography analysis includes both the analysis interfering component that needs to be decomposed by the photocatalytic reaction and the volatile analysis interfering component that can be removed only by heat treatment and degassing treatment. 1 is removed. As a result, if ion analysis is performed using the obtained pretreated sample, analysis of ions to be analyzed can be performed with high accuracy.

  For example, when analyzing cations such as Na ions contained in sample water such as cooling water to which ammonia and ethanolamine have been added for water quality adjustment at a power plant using an on-line ion chromatograph, ammonia and ethanolamine Is an interfering substance in ion chromatographic analysis, so that it is necessary to remove these components from the sample in advance in order to perform an accurate analysis. Ammonia can be removed only by evaporative removal treatment, but ethanolamine cannot be removed only by evaporative removal treatment. Ethanolamine can also be decomposed by a photocatalytic reaction, resulting in a decomposition product that can be removed by evaporation.

  When the sample water is treated as described above by the pretreatment device 1 for ion chromatography analysis, ethanolamine is decomposed by the photocatalytic reaction decomposition means 3 to generate decomposition products such as volatile methane, carbon dioxide, and ammonia. The decomposition product and ammonia originally contained in the sample water are evaporated and removed by the heating means 4 and the deaeration means 5. In this way, a pretreated sample from which the analysis interfering substances ammonia and ethanolamine, and decomposition products generated from ethanolamine are removed is obtained. Using this pretreated sample, it is possible to effectively analyze components to be analyzed such as Na and Mg ions.

  In general, when the concentration of ammonia is about 3 ppm or more, ion chromatographic analysis of Na and Mg ions becomes difficult. When the concentration is about 1 ppm or less, these ion chromatographic analyzes should be performed with high accuracy. Can do. For ethanolamine, generally, if the concentration is about 3 ppm or more, ion chromatographic analysis of Na and Mg ions becomes difficult, and if it is about 1 ppm or less, these ion chromatographic analyzes should be performed with high accuracy. Can do.

  Pre-treatment for ion chromatography analysis when the sample contains only volatile analytical interfering components that do not contain analytical interfering components that need to be decomposed by photocatalysis and can be removed only by heat treatment and degassing treatment The device 1 operates as follows.

  The first three-way valve 9 enables flow from the first flow path front half 12 to the bypass flow path 11 and disables flow from the first flow path front half 12 to the first flow path rear half 13. The second three-way valve 10 is adjusted to allow flow from the bypass flow path 11 to the second flow path rear half 15 and disable flow from the second flow path front half 14 to the second flow path rear half 15. (Hereinafter, this state is referred to as “a bypass route state”).

  The sample is supplied to the heating means 4 through the first channel first half 12, the bypass channel 11 and the second channel second half 15 by the action of the pump 2. The sample supplied to the heating means 4 is subjected to heat treatment by the heating means 4, and the volatile analysis interfering component contained in the sample is removed by evaporation. As a result, the heating means 4 can obtain a heat-treated sample generated by evaporating and removing volatile components from the sample.

  The heat-treated sample is supplied to the deaeration means 5 through the third flow path 8. The heat-treated sample supplied to the degassing means 5 is degassed by the degassing means 5, and volatile analysis interfering components contained in the heat-treated sample are removed by evaporation. Thus, the degassing means 5 can remove the volatile analysis interfering components that cannot be completely removed by the heat treatment of the heating means 4 and still remain in the heat-treated sample. As a result, the degassing means 5 provides a pretreated sample generated by evaporating and removing volatile components from the heat-treated sample.

  As a result, the volatile analysis interfering component in the sample is removed by evaporation. As described above, when the sample does not contain an analysis-interfering component that needs to be decomposed by the photocatalytic reaction, the ion chromatographic pretreatment apparatus 1 causes the sample to flow through the bypass channel 11 to provide photocatalytic reaction decomposing means. 3 can be directly introduced into the heating means 4. As a result, the sample can be quickly and efficiently pretreated, and the burden on the photocatalytic reaction decomposing means 3 can be reduced, and the life of the photocatalytic reaction decomposing means 3 can be extended.

  If ion analysis is performed using the obtained pretreated sample, analysis of ions to be analyzed can be performed with high accuracy.

  For example, when analyzing cations such as Na ions contained in sample water such as cooling water to which ammonia and hydrazine have been added for water quality adjustment at a power plant using an on-line ion chromatography device, ammonia and hydrazine are ions. Since it becomes an analysis interfering substance in chromatographic analysis, it is necessary to remove these components from the sample in advance in order to perform an accurate analysis. Ammonia and hydrazine are substances that can be removed only by evaporative removal treatment.

  When the sample water is processed as described above by the ion chromatographic analysis pretreatment apparatus 1, ammonia and hydrazine contained in the sample are evaporated and removed by the heating unit 4 and the deaeration unit 5. In this way, a pretreated sample from which ammonia and hydrazine as analysis interfering substances have been removed is obtained. Using this pretreated sample, it is possible to effectively analyze components to be analyzed such as Na and Mg ions.

  As can be seen from the above, the pretreatment device 1 for ion chromatography analysis includes a sample containing an analysis interfering component that needs to be decomposed by a photocatalytic reaction and a sample that does not contain an analysis interfering component that needs to be decomposed by a photocatalytic reaction. It can be suitably used for both.

  In power plants, there are cases where ammonia and ethanolamine are added to cooling water, etc. for water quality adjustment, and cases where ammonia and hydrazine are added, but in either case, as described above, The pretreatment device 1 for ion chromatography analysis can be used for pretreatment for ion chromatography analysis for water quality inspection.

  The processing conditions in the photocatalytic reaction decomposition means 3 are not particularly limited as long as the decomposition target component can be effectively decomposed by the photocatalytic reaction, but the processing temperature is 10 to 60 ° C., and the processing time is 15 to 60 minutes. If it exists, a suitable decomposition | disassembly process can be performed and it is suitable.

  The treatment condition in the heating means 4 is not particularly limited as long as the target component can be effectively removed by heat treatment, but the treatment temperature is 80 to 120 ° C. and the treatment time is 10 to 30 minutes. Suitable removal can be performed, which is preferable.

  The treatment conditions in the deaeration means 5 are not particularly limited as long as the target component can be effectively removed by heat treatment, but the treatment temperature is 40 to 60 ° C., the treatment time is 10 to 30 minutes, When the processing pressure is 50 to 760 mmHg, suitable removal can be performed, which is preferable.

  The pretreatment device 1 for ion chromatographic analysis can be used in a wide range of fields in which ion chromatographic analysis is performed including a power plant, and can be suitably used for water quality inspection of a power plant.

  The chemical analysis pretreatment apparatus according to the present invention is not limited to ion chromatographic analysis, and can be widely applied to chemical analysis that requires removal of analysis-interfering components as pretreatment.

Hereinafter, the pretreatment apparatus for chemical analysis according to the present invention will be described more specifically with reference to examples.
(1) Apparatus A chemical analysis pretreatment apparatus having the structure shown in FIG. 1 was used.
The photocatalytic reaction decomposition means has a photocatalyst portion having a total length of 450 mm, which is formed by coating TiO ₂ on a tubular body formed of SiO ₂ . The ultraviolet irradiation unit irradiates ultraviolet rays of 185 to 356 nm. The treatment temperature was 40 ° C.

  The structure of the heating means is a structure in which PEEK piping (outer diameter 1.6 mm, inner diameter 0.5 mm) is uniformly wound around the electric heater heating section. The treatment temperature was 80 ° C.

  The structure of the deaeration means is a structure formed by loading a hollow fiber membrane inside the deaeration device. The processing temperature was 60 ° C. and the processing pressure was 760 mmHg.

(2) Sample An aqueous solution containing 10 ppm of ammonium (sample 1) and an aqueous solution containing 20 ppm of ethanolamine (sample 2) were used.

(3) Test method and results For Sample 1, the chemical analysis pretreatment device was placed in a bypass route, and was passed through the heating means and deaeration means at a flow rate of 5 ml / min without passing the photocatalytic reaction decomposition means. It was. The ammonia concentration after passing through the deaeration means was measured with a 7310-20 type ion chromatogram analyzer manufactured by Nikkiso Co., Ltd. The results are shown in Table 1 as the final ammonia concentration.

  For sample 2, the pretreatment device for chemical analysis was placed through the photocatalytic reaction decomposing means, and the photocatalytic reaction decomposing means, heating means and degassing means were flowed at flow rates of 3 ml / min, 7 ml / min, 8 ml / min and 10 ml / min. Circulated. The ammonia concentration and ethanolamine concentration after passing through the deaeration means were measured with a 7310-20 type ion chromatogram analyzer manufactured by Nikkiso Co., Ltd. The results are shown in Table 1 as final ammonia concentration and final ethanolamine concentration.

FIG. 1 is a conceptual diagram of a pretreatment device 1 for ion chromatography analysis which is a specific example of the pretreatment device for chemical analysis according to the present invention. FIG. 2 is a partial longitudinal sectional view of the photocatalytic reaction decomposition means 3.

Explanation of symbols

1 .... Pretreatment device for chemical analysis, 2 .... Pump, 3 .... Photocatalytic reaction decomposition means, 4 .... Heating device, 5 .... Deaeration device, 6 .... First flow path, 7 .... Second flow , 8 .. 3rd flow path, 9 .. 1st three way switching valve, 10 .. 2nd 3 way switching valve, 11 .. Detour flow path, 12 .. First half of first flow path, 13. Second half of the flow path, 14 ··· Second half of the second flow passage, 15 ·· Second half of the second flow passage, 16 ·· Outer tube 16, 17 ··· Photocatalyst portion, 18 · · Ultraviolet irradiation portion

Claims (6)

A pretreatment device for chemical analysis which is a pretreatment device for ion chromatography analysis,
It comprises an outer tube, a photocatalyst portion accommodated in the outer tube, and an ultraviolet irradiation portion accommodated in the outer tube, and decomposes an analysis disturbing component contained in water used in a power plant by a photocatalytic reaction. A photocatalytic reaction decomposing means capable of receiving the decomposing-treated water obtained by the photocatalytic reaction decomposing means, and a volatile analysis interfering component contained in the supplied decomposing-treated water. A pretreatment device for chemical analysis, characterized by comprising evaporation removing means capable of removing by evaporation. A first flow path capable of supplying water used in the power plant to the photocatalytic reaction decomposition means , and water subjected to decomposition treatment obtained by the photocatalytic reaction decomposition means can be sent to the evaporation removing means The pretreatment device for chemical analysis according to claim 1, further comprising a second flow path. A detour channel forming means capable of sending water used in the power plant that circulates through the first channel to the evaporation removing unit without being circulated to the photocatalytic reaction decomposition unit is provided. The pretreatment apparatus for chemical analysis according to claim 2.   The detour channel forming means extends from the first three-way switching valve provided in the first channel, the second three-way switching valve provided in the second channel, and the first three-way switching valve, The pretreatment device for chemical analysis according to claim 3, further comprising a bypass flow path that reaches the two-way switching valve. The evaporation removal means by heating the decomposition treated water, degassed heating means volatile component contained in the decomposition treated water can be evaporated and removed, the degradation treated water The chemical analysis pretreatment device according to any one of claims 1 to 4, further comprising a deaeration unit capable of evaporating and removing a volatile component contained in the decomposed water .   The pretreatment device for chemical analysis according to any one of claims 1 to 5, wherein the photocatalytic reaction decomposition means has titanium dioxide as a photocatalyst.

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