JP2003270235A - Element analyzer and measuring method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an element analyzer capable of accurately performing measurements without being affected by previous samples to be measured and to provide a measuring method using the analyzer. <P>SOLUTION: In the element analyzer D, a sample S is gasified in a combustion part 1 and then analyzed. The element analyzer D is provided with a means for injecting a cleaning material W in the combustion part 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elemental analysis device and a measuring method using this device.

[0002]

2. Description of the Related Art As one of the above-mentioned elemental analyzers, there is a sulfur meter in fuel using a combustion-ultraviolet excitation method. This sulfur meter in fuel is equipped with a combustion unit for combusting the sample.

In the sulfur-in-fuel meter having the above structure, the sample is injected into the combustion section, and the gas generated by the combustion of the sample in the combustion section is sent to the detection section on the downstream side, whereby the sulfur of the sample is measured. The content is measured.

[0004]

However, in the sulfur meter in fuel having the above structure, when the sample is injected into the combustion part, the sample may adhere to a relatively low temperature part of the combustion part. There is a problem that the adhered sample is gradually melted and gasified, which adversely affects the subsequent measurement.

The present invention has been made in view of the above matters, and an object thereof is to provide an elemental analysis device and an elemental analysis device capable of performing accurate measurement without being influenced by a previous measurement sample. It is to provide the measuring method used.

[0006]

In order to achieve the above object, an elemental analysis device of the present invention is an elemental analysis device for performing measurement after gasifying a sample in a combustion part, and Means were provided for injecting the cleaning material (claim 1).

Further, the injection position for injecting the cleaning material may be arranged upstream of the injection position of the sample into the combustion section (claim 2).

According to the above arrangement, it is possible to provide an elemental analyzer capable of removing contamination caused by the adhered sample and performing accurate measurement without being affected by the previous measurement sample.

Further, the measuring method using the elemental analyzer of the present invention is a measuring method using the elemental analyzer which performs measurement after gasifying the sample in the combustion section. The cleaning material is injected into the combustion section (claim 3).

The injection position for injecting the cleaning material may be upstream of the injection position for the sample with respect to the combustion section (claim 4).

According to the above structure, a measuring method using an elemental analyzer capable of removing contamination caused by the adhered sample and performing accurate measurement without being affected by the previous measured sample is provided. can do.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. 1 is an explanatory view schematically showing the configuration of an elemental analysis device D which is an embodiment of the present invention, FIG.
And FIG. 3 is a perspective view and an explanatory view schematically showing the configuration of the injection device A. The elemental analyzer D is, for example, a sulfur meter in fuel (fluorescent X-ray sulfur analyzer) using a combustion-ultraviolet excitation method (combustion-ultraviolet fluorescence method), and a combustion unit for burning the sample S. 1, a sample injection unit 2 for injecting the sample S into the combustion unit 1, a detection unit (not shown) for detecting gas generated by combustion of the sample S in the combustion unit 1, and this detection And a computer (not shown) for calculating the content of the element in the sample S by integrating the signals corresponding to the gas concentrations obtained from the parts.

Further, the elemental analysis device D can automatically perform all the steps from the step of quantitatively collecting the sample S using the sample injection section 2 to the step of injecting the quantitatively sampled sample S into the combustion section 1. In order to achieve this, an injector A, which is an automatic sampler called a so-called autosampler, is provided on the upstream side of the combustion section 1. In addition, this injection device A
The sample injection part 2 is incorporated in the.

Further, the elemental analysis device D includes a dehydration unit (not shown) for removing water contained in the gas generated in the combustion unit 1 between the combustion unit 1 and the detection unit. ,
It has an HC cutter (not shown) for removing unburned hydrocarbons contained in the gas in this order from the upstream side.

The sample S is, for example, a liquid sample (liquid sample) of fuel oil or the like.

The combustion section 1 includes a horizontal combustion pipe 3 arranged in a substantially horizontal direction, and heating means such as a heater coil arranged outside the combustion pipe 3 for heating the combustion pipe 3. 4 is a combustion furnace.

The combustion tube 3 is formed in a horizontally long and flat shape, and is formed in a substantially cylindrical (for example, cylindrical) main body portion 3a and an upstream end and a downstream end of the main body portion 3a. It has an inlet portion 3b and an outlet portion 3c that are smaller in diameter than the portion 3a.

The tip portion (upstream end portion) of the inlet portion 3b has heat resistance, and is for preventing the flow of air and the like inside and outside the combustion tube 3 performed through the inlet portion 3b (that is, A sealing member 5 (for sealing the inlet portion 3b) is arranged. The sealing member 5 is, for example, a rubber plug made of heat resistant rubber.

Further, the inlet portion 3b is formed with a double pipe portion composed of an inner pipe 6 and an outer pipe 7 which communicate with each other on the downstream side, and the sample injection portion 2 is inserted into the inner pipe 6. To be done. Specifically, the outer pipe 7 is a part of the inlet portion 3b, and the inner pipe 6 formed inside the outer pipe 7 (inlet portion 3b) is arranged in the order from the upstream end side to the downstream side. It has a tapered surface portion 6a that becomes thinner and a thin tube portion 6b that is connected to the downstream end of the tapered surface portion 6a and that has a substantially constant diameter. The thin tube portion 6b is arranged such that its downstream end is located on the downstream side of the downstream end of the inlet portion 3b.
It is configured. The inner tube 6 has a diameter of, for example, 0.
The outer tube 7 has a diameter of, for example, 1.0 mm.

Further, a carrier gas supply passage 8 is connected to an upstream portion of the inner pipe 6, and the mixed gas supply passage 8 does not react with oxygen into the inner pipe 6, and Base gas consisting only of components not detected by the detector (for example, inert gas such as Ar or air)
Is supplied with a carrier gas mixed with oxygen, and the sample S injected into the inner tube 6 by the carrier gas thus supplied passes through the inside of the combustion portion 3a and the outlet portion 3c, It will be sent to the detection unit on the downstream side of the combustion unit 1. Here, the base gas is
It is a gas composed of a single or a plurality of components that does not adversely affect the analysis in the detection section.

The carrier gas supplied from the carrier gas supply passage 8 into the inner pipe 6 is not limited to the gas obtained by mixing oxygen with the base gas, but is composed of, for example, only oxygen. It may be gas.

On the other hand, an oxygen supply passage 9 is connected between the inner pipe 6 and the outer pipe 7, and the combustion pipe is passed from the oxygen supply passage 9 through the inner pipe 6 and the outer pipe 7. Oxygen is supplied into the interior of the combustion tube 3, and the oxygen thus supplied creates an oxygen atmosphere inside the combustion tube 3.

Inside the combustion pipe 3, the combustion pipe 3
By increasing the contact area with the sample S introduced into the
In order to efficiently heat the glass, a large number of chip bodies (not shown) such as quartz glass chips are housed.

The heating means 4 is arranged so as to surround the combustion pipe 3, and, for example, the inside of the combustion pipe 3 is about 1000-.
The combustion tube 3 is heated to 1100 ° C.

As described above, since the combustion pipe 3 is flat and surrounded by the heating means 4 composed of a heater coil, the temperature difference in the vertical, horizontal, and front-back directions inside the combustion pipe 3 is small. The sample S is placed under the combustion tube 3.
Since it burns without being left unburned even if the temperature drops, there is an advantage that the accuracy of analysis does not decrease due to insufficient combustion.

The injection device A includes the sample injection part 2 and
A moving mechanism 10 for moving the sample injection part 2 three-dimensionally
And a rotation mechanism 11 for rotating the sample injection part 2 around a horizontal axis, and a plurality of containers 1 capable of containing a liquid material.
In order to operate the container mounting part 13 on which the 2, 2, ... Are mounted, and the sample injection part 2, to perform quantitative sampling (suction) of the sample S by the sample injection part 2 and injection into the combustion part 1. And the needle 2 with respect to the sample injection part 2
Liquid material supply means 15 for supplying the liquid material from the syringe 2a (described later) side rather than the b (described later) side.
And a cleaning means 16 for cleaning the sample injection part 2.

The sample injection part 2 comprises a syringe 2a and a needle 2b formed at one end of the syringe 2a so that the interior thereof communicates with the interior of the syringe 2a.

The sample injection part 2 has a needle 2
The tip of b is immersed in the sample S, the sample collection position where the sample S can be sucked, and the needle 2b is inserted into the inner tube 6 of the combustion section 1, so that the sample S can be injected into the combustion section 1. A sample injection position and a cleaning tank 27 in which the needle 2b will be described later
The moving mechanism 10 and the rotating mechanism 11 are provided as means for moving to these three positions, namely, the cleaning position to be inserted into the cleaning liquid reservoir 27a.

The moving mechanism 10 includes a frame 17 extending in a direction approaching and separating from the combustion unit 1 (hereinafter, referred to as X direction), a sliding member 17a moving along the frame 17, and a sliding member. A motor (not shown) for sliding 17a along the frame 17 is housed,
A motor storage box 17b arranged at one end of the frame 17, a frame 18 extending in a direction orthogonal to the frame 17 (hereinafter referred to as Y direction), and a sliding member 18a moving along the frame 18. A motor (not shown) for sliding this sliding member 18a along the frame 18 is housed, and both the motor housing box 18b arranged at one end of the frame 18 and the frames 17, 18 are housed. A frame 19 extending in a direction (hereinafter, referred to as Z direction) perpendicular to the frame 19, a sliding member 19a that moves along the frame 19, and a motor for sliding the sliding member 19a along the frame 19 ( (Not shown), and a motor storage box 19b arranged at one end of the frame 19.

Then, any one of the frames 17, 18 and 19 is fixed to a sliding member which moves along any one of the other two frames, and further, this one frame is fixed. Is fixed to a sliding member that moves along the other frame. In this embodiment, the X direction is the horizontal direction and the Z direction is the vertical (vertical) direction. The X direction is the front-back direction when viewed from the combustion unit 1, and the Y direction is the left-right direction when viewed from the combustion unit 1.

Further, in this embodiment, the frame 17
Is fixed to a housing 20 (see FIG. 3) of the injection device A, and the frame 18 is fixed to a sliding member 17 a that moves along the frame 17.
9 is fixed to a sliding member 18 a that moves along the frame 18.

The rotating mechanism 11 rotates the holding block 11a for holding the syringe 2a of the sample injection unit 2 and the holding block 11a by about 90 ° around a horizontal axis (for example, around the Y axis). And a motor housing block 11b housing a motor (not shown) for storing the motor. The motor housing block 11b is fixed to a sliding member 19a that moves along the frame 19.

By the rotation of the holding block 11a, the sample injection part 2 held by the holding block 11a is in a posture parallel to the X direction (hereinafter, referred to as a horizontal posture 9 and parallel to the Z direction). The posture is switched to two postures (hereinafter, vertical posture).

The container 12 is a cylindrical container having an opening at the top and a bottom. The opening is closed by a plug member 12a, and the inside of the container 12 is hermetically sealed. . And in this embodiment, the container 12
A sample S is housed inside. The plug member 12
The material a is made of a material that can easily penetrate the needle 2b by being pierced. That is, the stopper member 12a is made of, for example, a rubber stopper or a cork stopper.

The container mounting portion 13 is formed by using, for example, a tray whose upper part is opened and whose inside is partitioned in a lattice pattern, and the container 12 is mounted with high stability so as not to fall over. It is configured to be able to.

The actuating means 14 comprises a connecting channel 21 connected to the syringe 2a of the sample injecting section 2 and a syringe pump 22 connected to the syringe 2a via the connecting channel 21. ing. The syringe 2a and the syringe pump 22 are in communication with each other through the connection flow path 21, and the sample injection unit 2 operates the syringe pump 22 to supply a predetermined amount of liquid material to the needle 2
It is configured such that it can be sucked from b and accommodated therein, and that the accommodated liquid material can be discharged from the tip of the needle 2b.

Here, the connecting flow passage 21 is provided with a three-way solenoid valve 23 as a switching valve portion in the downstream portion thereof, and by this three-way solenoid valve 23, the connecting flow passage 21 is connected to the three-way solenoid valve 23 and the sample. It is partitioned into a first connection flow path 21a formed between the syringe 2a of the injection part 2 and a second connection flow path 21b formed between the three-way solenoid valve 23 and the syringe pump 22.

The liquid material supply means 15 is a liquid material supply flow path 24 connected to the syringe 2a of the sample injection part 2 via the first connection flow path 21a, and the liquid material supply flow path 24. A pump 25 such as a diaphragm pump which is connected to the syringe 2a via a liquid body storage container 26 containing a liquid body in which the upstream portion of the liquid body supply channel 24 is dipped is provided.

Here, the liquid supply passage 24 is connected to the connection passage 21 (first connection passage 2) via the three-way solenoid valve 23.
1a), the three-way solenoid valve 23
By switching between the operating state in which the first connecting flow channel 21a and the second connecting flow channel 21b communicate with each other and the liquid supply state in which the first connecting flow channel 21a and the liquid supply channel 24 communicate with each other. It switches.

That is, the three-way solenoid valve 23 has a first valve portion 23a provided for the first connection flow passage 21a.
And a second valve portion 23b provided for the second connection flow passage 21b and a third valve portion 23c provided for the liquid supply passage 24, and the three-way solenoid valve 23 is The first valve portion 23a and the second valve portion 23 are to be activated.
b and the third valve portion 23c may be closed, and the three-way solenoid valve 23 may be in the liquid material supply state by the first valve portion 23a and the third valve portion. 23c
And the second valve portion 23b may be closed.

Instead of the three-way solenoid valve 23, three two-way solenoid valves (not shown) may be used. In this case, the first valve portion 23a, the second valve portion 23b, the third valve portion 2
Each of 3c may be configured by a two-way solenoid valve.

The cleaning means 16 has a cleaning liquid reservoir 27a into which the needle 2b of the sample injection part 2 can be inserted and an outlet 27b for discharging the liquid introduced into the cleaning liquid reservoir 27a. The cleaning tank 27 is provided with the liquid material supplying means 15 together.

The cleaning liquid reservoir 27a is formed, for example, in the shape of an elongated hole having a circular cross section, and is arranged in the vertical direction. The discharge port 27b is formed, for example, in a circular hole shape.

In order to clean the sample injecting section 2 by the cleaning means 16 having the above-described structure, first, in the liquid material container 26 of the liquid material supply means 15, the inner wall surface of the syringe 2a and the needle 2b are removed. The cleaning liquid L such as ethanol used for cleaning the wall surface and the outer wall surface is stored, and the needle 2b of the sample injection part 2 is inserted into the cleaning liquid reservoir part 27a.

When the three-way solenoid valve 23 is switched to the liquid material supply state and the pump 25 is operated, the cleaning liquid L in the liquid material container 26 is introduced into the sample injection part 2 from the syringe 2a side. After being sent and passed through the inside of the syringe 2a and the inside of the needle 2b, the liquid is discharged from the tip of the needle 2b into the cleaning liquid reservoir 27a. At this time, since the flow rate of the cleaning liquid L supplied from the sample injection part 2 into the cleaning liquid reservoir 27a is adjusted to be larger than the flow rate of the cleaning liquid L discharged from the discharge port 27b, the cleaning liquid L is adjusted. Is accumulated in the cleaning liquid reservoir 27a, and the cleaning liquid L is filled to a predetermined height in the cleaning liquid reservoir 27a.

With such a structure, not only the inner wall surface of the syringe 2a and the inner wall surface of the needle 2b of the sample injection part 2 but also the outer wall surface of the needle 2b can be washed.

The diameter of the cleaning liquid reservoir 27a, the diameter of the outlet 27b, and the cleaning liquid L discharged from the tip of the needle 2b are filled so that the cleaning liquid L can be filled up to a predetermined height in the cleaning liquid reservoir 27a. The flow rate, the height of the cleaning liquid reservoir 27a, etc. may be set appropriately.

Further, the cleaning liquid L supplied into the cleaning liquid reservoir 27a may be configured to overflow (overflow) from the upper side of the cleaning liquid reservoir 27a. In this case, the overflowing cleaning liquid L is drained. An overflow tank 27c for flowing to the outlet 27b may be provided so that the cleaning liquid L overflowing from the cleaning liquid reservoir 27a does not flow to the periphery of the cleaning tank 27.

The detection unit is a means (not shown) for irradiating the sample gas sent from the combustion unit 1 with ultraviolet rays (wavelength 215 nm), and light (fluorescence) generated by the irradiation with the ultraviolet rays. ) Is included in the detection means (not shown).

The detecting means is, for example, a photomultiplier (PMT).

Next, the elemental analysis device D having the above structure
The operation of will be described. First, a sample collecting step of quantitatively collecting the sample S using the sample injection unit 2 will be described. This sampling step is performed using the injection device A, and the first step of moving the sample injection part 2 to a certain position of the container 12 containing the sample S and the needle 2b of the sample injection part 2 are performed. It has a second step of immersing the sample S in the container 12 and a third step of sucking a predetermined amount of the sample S into the sample injection part 2 from the needle 2b.

The movement of the sample injection part 2 in the first step is performed by the moving mechanism 10 and the rotating mechanism 11. After the completion of the movement, the sample injection part 2
The needle 2b is in a state in which it can enter the container 12 (a vertically downward posture in this embodiment).

In the second step, the sample injection part 2 is moved by the moving mechanism 10 in the direction approaching the container 12, whereby the needle 2b is inserted through the stopper member 12a of the container 12 and the inside of the container 12 is closed. It will be immersed in the sample S.

In the third step, the three-way solenoid valve 23 is switched to the operating state, and the syringe pump 22 is operated to store a predetermined amount of the sample S in the sample injecting section 2. It will be.

Then, a sample S is prepared by using the sample injection part 2.
The sample injection step of injecting into the combustion section 1 will be described. This sample injection step is also performed by using the injection device A, and the sample injection part 2 reaches the position where the combustion part 1 exists.
Process for moving the sample and the needle 2b of the sample injection part 2
Has a fifth step of inserting into the combustion section 1 and a sixth step of injecting a predetermined amount of the sample S into the combustion section 1 from the needle 2b.

The movement of the sample injection part 2 in the fourth step is performed by the moving mechanism 10 and the rotating mechanism 11. After the completion of the movement, the sample injection part 2
The needle 2b is in a state in which it can enter the combustion unit 1 (horizontal direction in this embodiment).

In the fifth step, the sample injecting section 2 is moved by the moving mechanism 10 in the direction in which the sample injecting section 2 approaches the burning section 1, whereby the needle 2b is inserted through the sealing member 5 of the container 12 and the burning section is moved. 1 will be inserted.

In the sixth step, the three-way solenoid valve 23 is maintained in the operating state, and the operation of the syringe pump 22 causes a predetermined amount of the sample S to flow from the sample injection part 2 into the combustion part 1. Will be injected.

Next, the combustion process from the introduction of the sample S into the combustion section 1 to the downstream thereof will be described. This combustion step includes a seventh step of sending the sample S discharged from the tip of the needle 2b of the sample injection section 2 from the thin tube section 6b of the inner tube 6 to the main body section 3a of the combustion tube 3,
It has an eighth step of burning the sample S in the body portion 3a and a ninth step of leading the burned sample S to the downstream side of the combustion tube 3.

In the seventh step, the thin tube portion 6 of the inner tube 6 is
The sample S is discharged from the tip of the needle 2b located inside b, and the sample S discharged in this way is supplied from the carrier gas supply channel 8 connected to the upstream portion of the inner tube 6. After flowing through the narrow tube portion 6b by the carrier gas, the gas reaches the main body portion 3a of the combustion tube 3.

In the eighth step, the body portion 3 of the combustion tube 3 is
Since a has an oxygen atmosphere due to the oxygen supplied from the oxygen supply channel 9 connected to the upstream side, the sample S is reliably burned to become the sample gas. In the present embodiment, the sulfur component in the sample S injected into the combustion tube 3 is oxidized into sulfur dioxide (SO ₂ ) in the combustion section 1 in an oxygen atmosphere.

In the ninth step, the sample gas is discharged to the downstream side of the combustion section 1 together with the carrier gas.

Subsequently, the detection on the downstream side of the combustion section 1 is performed.
Section, the SO in the sample gas ₂(SO₂Numerator)
On the other hand, ultraviolet rays (wavelength 215 nm) are irradiated. this
By irradiation, SO₂Part of the molecule becomes excited and
Immediately, the molecule in the starting state is so unstable that
Transition to the ground state. And that's what happens at this time
Photoelectric light (fluorescence) corresponding to the energy difference between these states
Photomultiplier (PMT)
The total SO is detected by₂amount
Is required, this SO₂From the quantity and the capacity and density of the sample S, S
O₂To measure the concentration of and to convert it to mass concentration
Therefore, the concentration of the sulfur component that is the analysis target component in the sample S
You can get it.

After the measurement, in order to clean the sample injecting section 2 itself, the cleaning means 16 performs cleaning. The cleaning means 16 has been described above. Omit it.

Further, the elemental analysis device D having the above structure
Then, when the sample S is injected into the combustion unit 1, the sample S may adhere to a location in the combustion unit 1 where the temperature is relatively low. The combustion part 1 is also cleaned to remove it.

In order to clean the combustion section 1, in the elemental analysis apparatus D, the sample injection section 2 cleans the combustion section 1 at the time of cleaning the combustion section 1.
Is configured to be injected. That is, the elemental analysis device D has means for injecting the cleaning material W into the combustion part 1, and the sample injection part 2 is used as this cleaning material injection means. The cleaning material W may be injected into the combustion section 1 by the same steps as the steps 1 to 6 described above. In this case, the cleaning material W is stored in the container 12. You just keep it.

As the cleaning material W, the same material as the cleaning liquid L can be used. In particular,
A liquid (cleaning liquid) such as alcohol such as ethanol or water can be used as the cleaning material W.

The method of supplying the cleaning material W to the sample injection part 2 is not limited to the method of storing the cleaning material W in the sample injection part 2 by suction from the container 12 as shown in the first to third steps. , For example, the liquid material supply means 15
You may make it supply the cleaning material W in the sample injection part 2 using. In this case, the cleaning material W may be stored in the liquid material container 26.

Here, in the elemental analysis device D, as shown in FIG.
As shown in (A) and (B), the injection position w at which the cleaning material W is injected is the injection position s at which the sample S is injected.
It is configured to be on the upstream side. This is because the sample S discharged from the tip of the needle 2b flows between the needle 2b and the thin tube portion 6b of the inner tube 6 by the so-called capillary phenomenon without going to the downstream side of the combustion tube 3. This is because it may adhere to the inner peripheral surface of the inner pipe 6, and by changing the injection position of the cleaning material W as described above, as shown in FIG. The sample S adhering to the surface can also be washed and removed.
The excellent effect that the inside of the inner pipe 6 (near the thin pipe portion 6b), which has been a problem in the past, can be eliminated can be obtained.

In the elemental analyzer D having the above structure,
By surely removing the sample S adhering to the inside of the combustion section 1, it is possible to prevent the sample S adhering to the inside of the combustion section 1 from being gradually melted and gasified to have an adverse effect in the subsequent measurement.
It is possible to perform accurate measurement.

On the other hand, a measuring method using the elemental analysis apparatus of the present invention, that is, the elemental analysis apparatus D is used. After quantitatively collecting the sample S, the sample gas is burned in the combustion section 1 to generate the sample gas. The effect obtained by the elemental analysis device D can be obtained even by a measuring method in which the cleaning material W is injected from the sample injection part 2 into the combustion part 1 before or after the measurement of detection by the detection part. The same effect can be obtained.

In the above embodiment, the horizontal combustion pipe 3 is used for the combustion section 1. However, the present invention is not limited to such a configuration, and for example, the vertical combustion pipe 3 is arranged in the horizontal direction. Instead of the above, the combustion tube 3 arranged vertically may be used.

Further, in the above embodiment, the sample S is injected from the sample injection part 2 into the combustion part 1 by the injection device A, but the invention is not limited to such a configuration, and for example, the injection device is used. Instead of providing A, an operator or the like may manually inject the sample S from the sample injecting section 2 into the combustion section 1.

In the above embodiment, the sample S is injected into the combustion section 1 from the sample injection section 2.
The configuration is not limited to this. For example, without providing the injection device A, a worker or the like manually discharges the cleaning material to the combustion unit 1 using a cleaning syringe or the like,
You may make it wash the adhering unburned sample.

Further, in the above embodiment, the elemental analysis device D
As an example, a sulfur meter in fuel (fluorescent X-ray sulfur analyzer) for analyzing the sulfur component contained in the sample S is used, but the present invention is not limited to such a configuration, and for example, the sulfur component contained in the sample S is used. An analyzer for detecting a carbon component, a nitrogen component, a chlorine component, or the like that is a component other than the above may be used as the element analysis device D.

[0076]

As described above, according to the present invention having the above-described structure, it is possible to provide an elemental analysis apparatus and a measuring method using this apparatus, which can perform accurate measurement.

[Brief description of drawings]

FIG. 1 is an explanatory diagram schematically showing the configuration of an elemental analysis device according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing a configuration of an injection device in the above-mentioned embodiment.

FIG. 3 is an explanatory diagram schematically showing the configuration of the injection device.

FIG. 4A is an explanatory view schematically showing a configuration of a main part at the time of measurement in the above-mentioned embodiment, and FIG. 4B is an explanatory diagram schematically showing a configuration of a main part at the time of cleaning. [Fig. 4] is an explanatory diagram schematically showing a configuration of a main part after cleaning.

[Explanation of symbols]

1 ... Combustion part, D ... Elemental analysis device, S ... Sample, W ... Cleaning material.

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Claims (4)

[Claims] 1. An elemental analysis device for performing measurement after gasifying a sample in a combustion part, wherein the elemental analysis device is provided with means for injecting a cleaning material into the combustion part. . 2. The elemental analysis device according to claim 1, wherein the injection position for injecting the cleaning material is configured to be on the upstream side of the injection position for the sample into the combustion section. 3. A measurement method using an elemental analyzer for performing measurement after gasifying a sample in a combustion part, wherein a cleaning material is injected into the combustion part before or after the measurement. A measuring method using an elemental analyzer characterized by the above. 4. The measuring method using the elemental analyzer according to claim 3, wherein the injection position for injecting the cleaning material is located upstream of the injection position for the sample in the combustion section.