JP2008145164A - Structure of reaction part for trihalomethanes analyzer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of reaction part for a trihalomethanes analyzer, capable of restraining heat from being transferred from a reaction part side to a separation/dissolution part side, so as to prevent performance from getting worse caused by overheating in a separation/dissolution part constitutive member, and capable of reducing an analyzer cost by making the structure of a reaction part and a separation/dissolution part, simple and compact. <P>SOLUTION: The structure includes the reaction part 36 for heating a trihalomethanes dissolved carrier solution from the separation/dissolution part 38 for separating tri-halo-methane gas from a water sample and for dissolved it into a carrier liquid, and for bringing the trihalomethanes into reaction with a nicotinamide, and the reaction part 36 includes a tube 31 having a flare-shaped terminal, a plane 30 with a groove formed with the groove 30s capable of embedding continuously the tube 31, and having a hole 30t drilled to draw out a flare-shaped portion of the tube 31 to an outside, and a reaction part presser bar 32 having a flat part brought into close contact with a flat face of the plane 30 with the groove. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a trihalomethane gas reaction unit structure used in a trihalomethane analyzer for low melting point organic chlorine compounds in a solution.

  Trihalomethane is produced due to organic compounds in water and chlorine used to ensure epidemiological safety. Trihalomethane in water is volatile and has the property of being able to permeate a microporous membrane as a gas. This permeated trihalomethane can be separated from suspensions in water, ions and various interferences by dissolving in the carrier liquid.

As the trihalomethane analyzer for automatically analyzing the trihalomethane, there are provided techniques such as Patent Document 1 (Japanese Patent Laid-Open No. Hei 4-223266) and Patent Document 2 (Japanese Patent Laid-Open No. Hei 2-145961) related to the applicant's application. ing.
FIG. 5 is a system diagram showing the basic configuration of such a trihalomethane analyzer.
In this trihalomethane analyzer, a carrier liquid feeding part such as a liquid feeding pump 3, a sample liquid feeding part such as a liquid feeding pump 7, a trihalomethane gas separation / dissolution part such as a separation / dissolution part 38, and a reaction part 9 , And a detection unit 10.

The liquid feed pump 3 separates a carrier liquid 12 in which a nicotinamide solution introduced through the nicotinamide solenoid valve 1 and a sodium hydroxide solution introduced through the sodium hydroxide solenoid valve 2 are mixed. It is configured to be supplied to the melting unit 38.
The liquid feed pump 7 mixes an acidic reducing agent solution (hydrazine sulfate solution) introduced through the acidic reducing agent solution electromagnetic valve 6 with the sample water 4 containing trihalomethane introduced through the sample water electromagnetic valve 5. The separation / dissolution unit 38 is supplied. In relation to the separation / dissolution unit 38, an air pump 11 that supplies air into the gas chamber 23 in the separation / dissolution unit 38 is provided.
In the separation / dissolution part 38, the trihalomethane gas is separated from the sample water 4 heated to about 70 ° C. by the heaters 13 and 14 through the internal gas separation membrane 24. The separated and gasified trihalomethane gas comes into contact with the gas dissolution film 25 through which the carrier liquid 12 flows, so that it is dissolved in the carrier liquid 12 and conveyed to the reaction unit 9.

The reaction unit 9 is maintained at about 90 ° C. by the heater 16, and is heated to about 90 ° C. by the heater 16 in the course of flowing the carrier liquid 12, and the trihalomethane in the carrier liquid 12 is reacted with nicotinamide. ing.
The detection unit 10 measures the fluorescence intensity of the reaction product in the reaction unit 9 and transmits the photomal sensor signal to an analysis unit (not shown).
The waste water subjected to the above analysis process passes through the pipe 51, joins the drainage of the sample water 4 discharged from the separation / dissolution part 38 through the drain pipe 52, and is discharged to the outside. become.

FIG. 6 is a development view showing the connection structure of the reaction section 9 and the separation / dissolution section.
In FIG. 6, reference numeral 38 denotes a separation / dissolution part that separates trihalomethane gas from sample water and dissolves it in the carrier liquid, and 9 denotes a reaction part that reacts trihalomethane in the carrier liquid 12 with nicotinamide.
The separation / dissolution part 38 and the reaction part 9 are sandwiched between the sample water flow path pressing plate 27 and the carrier liquid flow path pressing plate 29 so as to be sandwiched between the carrier liquid flow path plate 28, the gas dissolution film 25, and the gas chamber plate 23. The gas separation membrane 24 and the sample water flow path plate 26 are screwed and fixed through through holes formed in each of them.
The gas separation membrane 24 and the gas dissolution membrane 25 have fine pores having a pore diameter of 0.1 μm or less, for example.
The heater 13 and the heater 14 arranged on both sides of the separation / dissolution part 38 are for heating the sample water 4 and the carrier liquid 12, respectively.

Next, the details of the separation / dissolution part 38 will be described.
In FIG. 6, the sample water 4 is injected from the sample water inlet 20A, flows into the flow path constituted by the groove of the sample water flow path plate 26 and the gas separation membrane 24, and is discharged from the sample water outlet 20B. It has become. At this time, the sample water 4 flows while in contact with the gas separation membrane 24. When the sample water 4 contains trihalomethane, it is heated and gasified by the heater 13 and reaches the flow path of the gas chamber 23 together with water vapor through the gas separation membrane 24.
The trihalomethane gas accumulated in the flow path of the gas chamber 23 contacts the gas dissolution film 25. On the other hand, the carrier liquid 12 comes into contact with the gas dissolution film 25 so as to enter the carrier liquid flow path 28 and the gas dissolution film 25 through the carrier liquid inlet 22A and discharge from the carrier liquid outlet 22B in the figure. It is flowing. In this state, the trihalomethane gas 30 is dissolved in the carrier liquid through the gas dissolution film 25.

Next, the water vapor discharging means in the above apparatus will be described.
As described above, the sample water 4 is heated and gasified by the heater 13 and reaches the flow path of the gas chamber plate 23 together with the water vapor through the gas separation membrane 24. The saturation time of the trihalomethane gas in the gas chamber plate 23 and the time required for dissolution of the trihalomethane gas take at least 30 minutes.
In the meantime, a large amount of water vapor evaporates with the trihalomethane gas, and adheres to the flow path of the gas chamber plate 23 and the surfaces of the gas dissolution membrane 25 and the gas separation membrane 24 disposed on both sides thereof.
As a means for discharging the condensed water, the gas chamber plate 23 is installed vertically as shown in FIG. 6, and the flow path has a stepwise inclined shape. With this configuration, the dew condensation water flows downward in the gas chamber 23 and is discharged to the outside through the three air outlets 21B shown in FIG.

FIG. 7 is an exploded perspective view showing a conventional connection structure of the reaction unit 9.
In FIG. 7, the separation / dissolution part 38 and the reaction part 9 are connected by a joint 37 and a connection tube 18. Further, the tube 31 for heating and reacting the trihalomethane gas-dissolved carrier liquid is sandwiched and disposed between the reaction part flow path plate 30 and the reaction part presser plate 32.
In this way, after the trihalomethane gas is dissolved in the carrier liquid 12 by the separation / dissolution part 38, the separation / dissolution part 38 and the reaction part 9 are connected by the joint 37 and the connecting tube 18. The trihalomethane gas-dissolved carrier liquid transported from 38 through the connection tube 18 is heated to about 90 ° C. by the heater 16 in the reaction section 9, and then sent from the carrier liquid outlet 22B to the detection section 10 (see FIG. 5) for fluorescence. Will be detected.
JP-A-4-223266 Japanese Laid-Open Patent Publication No. 2-145961

The prior art shown in FIGS. 6 and 7 has the following problems to be solved.
That is, in the trihalomethane analyzer shown in FIGS. 6 and 7, the separation / dissolution unit 38 and the reaction unit 9 are configured as separate parts. This reason is based on the internal structure of the reaction part 9.
That is, as shown in FIG. 7, the reaction unit 9 is caused to react at a temperature of about 90 ° C. in order to change the carrier liquid 12 in which the trihalomethane gas is dissolved in the separation / dissolution unit 38 into a fluorescent substance. .
For this reason, the reaction tube 31 is sandwiched between the reaction part flow path plate 30 and the reaction part presser plate 32 so that the reaction efficiency is improved by reducing the distance from the heater 16.

However, by incorporating the tube 31 inside the reaction part flow path plate 30 and the reaction part holding plate 32, the separation / dissolution part 38 and the connection between the tube 31 and the separation / dissolution part 38 are connected to each other. The connection tube 18 and the joint 37 must be used.
However, the joint part on the reaction part 9 side has a high temperature of about 90 ° C. For this reason, the joint 37 and the tube 31 are softened by the heat transfer from the reaction part 9 side, and the joint reliability is lowered.
Further, in the trihalomethane analyzer shown in FIGS. 6 and 7, the heating temperature of the separation / dissolution part 38 is about 70 ° C., and the temperature of the reaction part 9 is about 90 ° C. Since such a reaction section 9 has a single flow path, the width can be reduced, and since the distance from the heater 16 is short and the heat conduction is good, the carrier in the tube 31 can be heated by heating from one side. The liquid 12 can be controlled to be heated to a predetermined temperature of about 90 ° C.
On the other hand, in the separation / dissolution part 38, the sample water 4 and the carrier liquid 12 flow through two flow paths of the sample flow path plate 26 and the carrier liquid flow path plate 28 with the gas chamber plate 23 interposed therebetween. In order to control each temperature to be the same 70 ° C., it is difficult to keep the temperature uniform with only one side of the heat flow in one direction.
Therefore, in the trihalomethane analyzer shown in FIGS. 6 and 7, it is necessary to install the heater 13 and the heater 14 on both sides of the separation / dissolution part 38, thereby increasing the cost of the apparatus.
Further, since the separation / dissolution part 38 and the reaction part 9 are divided into two parts, the volume of the entire apparatus is large.

  The present invention has been made in view of such a situation, and its purpose is to suppress heat transfer from the reaction part side to the separation / dissolution part side and to reduce performance due to overheating of the separation / dissolution part constituent member. It is another object of the present invention to provide a reaction part structure of a trihalomethane analyzer that can reduce the cost of the apparatus by preventing and reducing the structure of the reaction part and the separation / dissolution part.

In order to solve the above-mentioned problems of the prior art, the present invention comprises a separation / dissolution part that separates trihalomethane gas from sample water and dissolves it in a carrier liquid, and heats a trihalomethane gas-dissolved carrier liquid from the separation / dissolution part. And a reaction section for reacting trihalomethane with nicotinic acid amide, wherein the reaction section has a flare at the end, and the tube in which the trihalomethane gas-dissolved carrier fluid flows is continuous with the tube. A grooved flat plate in which a groove that can be embedded is formed and a hole through which the flare-shaped portion of the tube can be led to the outside is formed, and a flat surface that can be in close contact with the flat surface of the grooved flat plate And a flat cover having a portion.
In the present invention, preferably, the tube is made of a tetrafluoroethylene compound such as PTFE or PFA.

The present invention also provides a separation / dissolution part for separating the trihalomethane gas from the sample water and dissolving it in the carrier liquid, and heating the trihalomethane gas-dissolved carrier liquid from the separation / dissolution part to react the trihalomethane with nicotinamide. In the trihalomethane analyzer equipped with a reaction section, the reaction section includes a grooved flat plate in which a groove through which the trihalomethane gas-dissolved carrier liquid flows, and a flat surface that can be welded to the flat portion of the grooved flat plate. And a liquid seal of the trihalomethane gas-dissolved carrier liquid flowing in the groove by the welded portion.
In the present invention, preferably, the grooved flat plate is formed using a tetrafluoroethylene compound such as PTFE or PFA as a material.

As described above, according to the reaction part structure of the trihalomethane analyzer according to the present invention, the reaction part has a flared end and a tube through which the trihalomethane gas-dissolved carrier fluid flows, and this tube can be continuously embedded. And a flat cover having a flat portion that can be brought into close contact with the flat surface of the grooved flat plate, and a flat plate having a groove formed with a hole through which a flare-shaped portion of the tube can be led out. Or the reaction part is a grooved flat plate in which a groove through which the trihalomethane gas-dissolved carrier liquid flows is formed, and a flat plate having a flat surface that can be welded to the flat part of the grooved flat plate. Since it is configured to perform the liquid seal of the trihalomethane gas dissolution carrier liquid by welding, the separation / dissolution part and the reaction part can be directly connected, and the joint as described above It eliminates the need for piping at the connection, and can solve the problem of softening of the joint due to the high temperature of about 90 ° C near the joint for connection between the separation / dissolution part and the reaction part as described above. The reliability of the trihalomethane analyzer can be improved in each stage.
Further, by directly connecting and integrating the separation / dissolution part and the reaction part, the rigidity as the mechanical structure is improved, and the vibration and impact resistance can be improved.

In addition, the configuration of the present invention eliminates the need for the joints and related piping as described above, thereby greatly reducing the volume of the reaction part and the separation / dissolution part (30% or more), and reducing the size of the trihalomethane analyzer. Can be
Furthermore, the separation / dissolution part and the reaction part are directly connected and integrated, so that the separation / dissolution part and the reaction part are heated from both sides by two heaters to maintain the heating efficiency, while the separation / dissolution part is maintained. It is possible to eliminate the heater installed between the reactor and the reaction section, and it is possible to reduce the power consumption for heating the heater (about 30% reduction) and the number of parts.
As described above, the trihalomethane analyzer can be reduced in size and cost.

  Below, the embodiment is described in detail about the reaction part structure of the trihalomethane analyzer concerning the present invention.

[First Embodiment]
FIG. 1 is an exploded perspective view showing a connection structure of a reaction unit and a separation / dissolution unit of a trihalomethane analyzer according to a first embodiment of the present invention.
In FIG. 1, reference numeral 38 denotes a separation / dissolution part which is a part for separating the trihalomethane gas from the sample water 4 (see FIG. 5) and dissolving it in the carrier liquid 12, and 36 is a reaction of the trihalomethane in the carrier liquid 12 with nicotinamide. It is a reaction part and is comprised as a reaction part with an exit flange so that it may mention later.
The separation / dissolution part 38 is sandwiched between the carrier liquid channel pressing plate 29 and the sample water channel pressing plate 27 so as to be vertically arranged, the carrier liquid channel plate 28, the gas dissolving film 25, the gas The chamber plate 23, the gas separation membrane 24, and the sample water flow path plate 26 are screwed and fixed in this order via through holes formed in each of them.
Both the gas separation membrane 24 and the gas dissolution membrane 25 have fine pores having a pore diameter of 0.1 μm or less, for example.
In addition, the heater 13 disposed in the vicinity of the separation / dissolution unit 38 heats the sample water 4 and the carrier liquid 12 respectively, and the heater 16 disposed in the vicinity of the reaction unit 36 with the outlet flange. Is for heating the trihalomethane gas-dissolved carrier liquid in the reaction section 36.

The sample water 4 is injected from the sample water inlet 20A, flows into the flow path constituted by the sample water flow path plate 26 and the gas separation membrane 24, and is discharged from the sample water outlet 20B. At this time, the sample water 4 flows through a groove-shaped sample water passage 26s formed on the surface of the sample water flow path plate 26 on the gas separation membrane 24 side while being in contact with the gas separation membrane 24. For this reason, the sample water passage 26s is formed in a zigzag shape (meandering shape) inclined like a staircase in the vertical direction so that the length of the flow path is increased, and the sample water inlet 20A is provided with the sample water inlet 20A. The sample water outlet 20B is disposed at the upper part of the sample water passage 26s while being disposed at the lower part of the passage 26s.
When trihalomethane is contained in such sample water 4, it is gasified by being heated to, for example, a boiling point of 62.5 ° C. or higher of the trihalomethane by the heater 13, and this trihalomethane gas passes through the gas separation membrane 24 and passes through the gas chamber. The plate 23 reaches the trihalomethane gas flow path 23s.
In the gas chamber plate 23, a groove-like trihalomethane gas flow path 23s penetrates the gas chamber plate 23 and is formed in a zigzag shape (meandering shape) inclined like a staircase in the vertical direction. The trihalomethane gas passage 23s of the gas chamber plate 23 and the sample water passage 26s of the sample water passage plate 26 are arranged so as to face each other with the gas separation membrane 24 interposed therebetween. Therefore, the trihalomethane gas accumulated in the trihalomethane gas flow path 23 s flows while being in contact with the gas dissolution membrane 25 and also in contact with the gas separation membrane 24.
On the other hand, the carrier liquid 12 (see FIG. 5) enters from the carrier liquid inlet 22A and has a zigzag shape (meandering shape) inclined like a staircase in the vertical direction on the surface of the carrier liquid flow path plate 28 on the gas dissolution film 25 side. It flows through the formed groove-shaped carrier liquid flow path 28s in contact with the gas dissolution film 25 and is discharged from the carrier liquid outlet 22B. When the carrier liquid 12 flows, the trihalomethane gas is dissolved into the carrier liquid 12 through the gas dissolution film 25.

2 shows the connection structure of the reaction part in the first embodiment, (A) is an exploded perspective view of the reaction part with the outlet flange, (B) is an enlarged view of part A in (A), and (C) is the outlet flange. An assembled perspective view of the attached reaction part, (D) is an enlarged view of part B in (C).
In the reaction part 36 with the outlet flange shown in FIG. 2, the heating and reaction tube 31 through which the trihalomethane gas-dissolved carrier liquid flows is formed in a meandering shape that extends in the horizontal direction and bends at the end and extends up and down. The reaction part channel plate 30 and the reaction part pressing plate 32 are sandwiched between the reaction part channel plate 30 and the groove 30s of the reaction part channel plate 30 so as to be continuously embedded. Therefore, the reaction part flow path plate 30 is configured as a flat plate with a groove, and the groove 30 s is formed in a meandering shape corresponding to the tube 31. Moreover, the reaction part pressing plate 32 is comprised as a flat cover which has a flat part which can be closely_contact | adhered with the flat surface of the reaction part flow-path board 30 as a flat plate with a groove | channel.
The tube 31 is formed by using, as a material, a tetrafluoroethylene compound such as PTFEPFA that has flexibility and is easily flared as described later.

The end part located in the upper part of the tube 31 extends toward the reaction part flow path plate 30 and serves as a connection part to the reaction part flow path plate 30. Is given. By flaring the end portion of the tube 31, as shown in FIG. 2B, the end portion of the tube 31 is formed to be a flare-shaped flange portion 31a.
On the other hand, in the reaction part flow path plate 30, a hole 30t is formed at the end of the embedded part of the tube 31, that is, the insertion position of the flange part 31a, through which the flange part 31a of the tube 31 is separated from the separation / dissolution part 38 side. Can be derived. In addition, the terminal part located in the lower part of the tube 31 extends through the reaction part pressing plate 32.

Thus, the flare processing of the end portion of the tube 31 forms the flare-shaped flange portion 31a. Therefore, as shown in the B portion of FIGS. 2 (C) and 2 (D), the reaction portion 36 with the outlet flange. And the carrier liquid flow path pressing plate 29 of the separation / dissolution part 38 can be in contact with the flange part 31a at the inlet part, and the reaction part 36 with the outlet flange and the carrier liquid flow path pressing plate of the separation / dissolution part 38. By connecting the screws 29 together, the flow of the carrier liquid can be completely sealed.
With this configuration, the separation / dissolution part 38 and the reaction part (reaction part with outlet flange) 36 are integrated, and the separation / dissolution part 38 and the reaction part (reaction with outlet flange) as shown in FIGS. Part) and a pipe and a joint for connecting to 36 become unnecessary.

In the first embodiment of the present invention, the carrier liquid flow from the separation / dissolution part 38 to the reaction part 36 is the carrier liquid injected from the carrier liquid inlet 22A. The carrier liquid passage 28s is entered, and the carrier liquid passage plate 28 dissolves the trihalomethane gas to form a trihalomethane gas-dissolved carrier liquid.
Then, this trihalomethane gas-dissolved carrier liquid enters the reaction section 36 with an outlet flange via the carrier liquid flow path holding plate 29, and is heated to about 90 ° C. by the heater 16 inside the reaction section 36. The liquid is discharged from the liquid outlet 22B and sent to the detection unit 10 (see FIG. 5) to detect fluorescence.

[Second Embodiment]
FIG. 3 is an exploded perspective view showing the connection structure of the reaction unit and separation / dissolution unit of the trihalomethane analyzer according to the second embodiment of the present invention. FIG. 4 is an exploded perspective view showing the connection structure of the reaction part in the second embodiment of the present invention.
In the second embodiment, as shown in FIG. 4, the welding reaction part 35 thermally welds the weldable reaction part pressing plate 34 and the weldable reaction part flow path plate 33 to each other on flat surfaces. It is constituted by.
And the meandering groove | channel 33a which is a reaction channel through which the trihalomethane gas melt | dissolution carrier liquid from the separation / dissolution part 38 flows is formed in the reaction part flow path plate 33, It is configured as a flat plate with grooves.

That is, the welding reaction part 35 welds the flat part of the reaction part flow path plate 33 made of a flat plate with the groove 33a and the flat surface of the reaction part pressing plate 34, and the groove 33a is welded by the welding part. It is configured to perform liquid sealing of the trihalomethane gas-dissolving carrier liquid that flows inside.
And the reaction part flow-path board 33 is formed by using tetrafluoroethylene compounds, such as PTFE and PFA with favorable weldability, as a material.
The heat welding is performed by heating to 320 ° C. or higher, which is the melting point of the material of the reaction part presser plate 34 and the reaction part flow path plate 33. By such welding, the inlet and outlet of the welding reaction part 35 are formed with holes.

Thereby, the welding reaction part 35, the carrier liquid flow path pressing plate 29 and the carrier liquid flow path plate 28 of the separation / dissolution part 38 can come into contact with each other through the holes, and the carrier liquid flow path pressing plate 29 and A carrier liquid flow can be completely sealed by screw-connecting the carrier liquid flow path plates 28 to each other.
As described above, the separation / dissolution part 38 and the welding reaction part 35 are integrated, and piping and joints for connecting the two as shown in FIGS. 6 and 7 are not necessary.

As for the series of carrier liquid flows from the separation / dissolution part 38 to the reaction part 35 in the second embodiment of the present invention, the carrier liquid injected from the carrier liquid inlet 22A is the same as in the first embodiment. Then, the carrier liquid flow path plate 28 enters the carrier liquid flow path 28s, and the carrier liquid flow path plate 28 dissolves the trihalomethane gas to form a trihalomethane gas-dissolved carrier liquid.
Then, this trihalomethane gas-dissolved carrier liquid enters the welding reaction section 35 via the carrier liquid flow path holding plate 29, and is heated to about 90 ° C. by the heater 16 inside the welding reaction section 35, and the carrier liquid outlet It is discharged from 22B and sent to the detection unit 10 (see FIG. 5) to detect fluorescence.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

FIG. 2 is an exploded perspective view showing a connection structure of a reaction unit and a separation / dissolution unit of the trihalomethane analyzer according to the first embodiment of the present invention. The reaction part connection structure in the said 1st Embodiment is shown, (A) is a disassembled perspective view of a reaction part, (B) is the A section enlarged view in (A), (C) is an assembly perspective view of a reaction part, D) is an enlarged view of a portion B in (C). It is a disassembled perspective view which shows the connection structure of the reaction part and separation / dissolution part of the trihalomethane analyzer which concerns on 2nd Embodiment of this invention. It is a disassembled perspective view which shows the connection structure of the reaction part in the said 2nd Embodiment. It is a systematic diagram which shows the basic composition of a trihalomethane analyzer. It is a disassembled perspective view which shows the connection structure of the reaction part and separation / dissolution part which concern on a prior art. It is a disassembled perspective view which shows the connection structure of the reaction part which concerns on a prior art.

Explanation of symbols

4 Sample water 9 Reaction section 10 Detection section 12 Carrier liquid 13, 16 Heater 23 Gas chamber 25 Gas dissolution film 29 Carrier liquid flow path holding plate 30 Reaction section flow path plate 30s Groove 30t Hole 31 Tube 31a Flange (flare-shaped end) )
32 Reactor holding plate (flat cover)
33 reaction part flow path plate 33a groove 34 reaction part holding plate 35 welding reaction part 36 reaction part with outlet flange 38 separation / dissolution part

Claims (4)

A separation / dissolution part for separating the trihalomethane gas from the sample water and dissolving it in the carrier liquid, and a reaction part for heating the trihalomethane gas-dissolved carrier liquid from the separation / dissolution part to react the trihalomethane with nicotinamide. In the trihalomethane analyzer,
The reaction part has a flare-shaped end, a tube through which the trihalomethane gas-dissolved carrier liquid flows, a groove in which the tube can be continuously embedded, and a flare-shaped part of the tube outside. A reaction part structure of a trihalomethane analyzer comprising: a flat plate with a groove in which a hole that can be led out is provided; and a flat cover having a flat portion that can be in close contact with the flat surface of the flat plate with the groove .   The reaction section structure of a trihalomethane analyzer according to claim 1, wherein the tube is formed using a tetrafluoroethylene compound as a material. A separation / dissolution part for separating the trihalomethane gas from the sample water and dissolving it in the carrier liquid, and a reaction part for heating the trihalomethane gas-dissolved carrier liquid from the separation / dissolution part to react the trihalomethane with nicotinamide. In the trihalomethane analyzer,
The reaction section welds a grooved flat plate in which a groove through which the trihalomethane gas-dissolved carrier liquid flows is formed, and a flat plate of the grooved flat plate and a flat plate having a flat surface that can be welded. The reaction part structure of the trihalomethane analyzer characterized by performing the liquid sealing of the said trihalomethane gas melt | dissolution carrier liquid which flows in the said groove | channel by.   The reaction part structure of a trihalomethane analyzer according to claim 3, wherein the grooved flat plate is formed using a tetrafluoroethylene compound as a material.

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