Separation drainage type elemental analyzer

Abstract

A ten-way valve is provided with ten connection points, an outlet of a first filter is communicated with the first connection point through a pipeline, a second connection point is communicated with an inlet of a reduction furnace through a pipeline, and an outlet of the reduction furnace is communicated with an inlet of a second filter. An outlet of the second filter is respectively connected to a fifth connection point and a seventh connection point through pipelines, a sixth connection point is connected with a first emptying pipeline, and an eighth connection point is connected to an inlet of the first chromatographic column through a pipeline; the four-way valve is provided with four contacts, the outlet of the first chromatographic column is connected with the first contact through a pipeline, the second contact is connected with the inlet of the second chromatographic column, and the second chromatographic column is connected with the mass spectrometer through the first open type flow divider. According to the invention, analysis and determination of isotope abundance of organic carbon and nitrogen are completed, and water vapor in the system can be rapidly discharged in a separation manner.

Description

Technical Field

[0001] The invention relates to the technical field of analytical chemistry, in particular to a separation and drainage type element analyzer. Background Art

[0002] The FLASH2000 organic element analyzer of ThermoFisher Scientific is currently the most widely used instrument in the domestic and international markets for the analysis of carbon and nitrogen elements in organic matter. The instrument has excellent applications in terms of performance, gas path control and connection, and data processing. Due to its shortcomings in combustion conversion rate, sample accumulation effect, and filler replacement, Sun Weizhen, Yu Haitang, etc., based on its test principles, improved and developed an organic carbon and nitrogen analyzer for soil and plants (patent number: ZL 201310285112.1); at the same time, based on the above development, an online regeneration experimental method for fillers used in organic carbon and nitrogen analysis was summarized in the actual application process (patent number: ZL201410619500.3).

[0003] In actual applications, the impact of which method is used to remove water from the system on the test results has always been a concern of users: The FLASH 2000 organic element analyzer uses an adsorption trap to remove water, using magnesium perchlorate as an adsorbent. When the water in the adsorbent is close to saturation, a new adsorption trap must be replaced and cannot be reused; the element analyzer developed by Sun Weizhen, Yu Haitang, etc. uses an electric cold trap to remove water, which effectively eliminates the possible impact of the adsorbent and overcomes the shortcomings of frequent replacement. It is both environmentally friendly and convenient and ensures accurate test results; due to the diversity of samples, the amount of residual water after sample processing from different sources and the amount of water generated after sample combustion vary greatly, and the low-temperature freezing / high-temperature discharge function of the electric cold trap dehydration method is limited (if the sample has a high water content, the frozen water will fill the water storage pipe designed for the electric cold trap, thereby affecting the circulation of the airflow; if the water storage pipe designed for the electric cold trap is lengthened, the water vapor discharge time after heating will be extended, thereby affecting the test of the next sample).

[0004] Therefore, a faster, more efficient and more convenient water removal method is needed to improve the testing function of the element analyzer and cope with the testing of samples from different sources. Summary of the invention

[0005] The purpose of the present invention is to provide a separation-water displacement element analyzer to address the technical defects in the prior art, which cooperates with a gas isotope mass spectrometer to jointly complete the analysis and determination of the isotope abundance of organic carbon and nitrogen.

[0006] The technical solution adopted to achieve the purpose of the present invention is: A separation and drainage type elemental analyzer, comprising a ten-way valve, a four-way valve, an oxidation furnace, a reduction furnace, a first filter, a second filter, a first open splitter, a first chromatographic column, a second chromatographic column, an automatic sampler and a mass spectrometer, wherein: The outlet of the automatic sampler is connected to the inlet of the oxidation furnace through a pipeline, and the outlet of the oxidation furnace is connected to the inlet of the first filter through a pipeline; The ten-way valve is provided with ten connection points arranged in a ring in sequence. When the ten-way valve switches between two connection states, each connection point is selectively connected to its adjacent connection point. The outlet of the first filter is connected to the first connection point through a pipeline, the second connection point is connected to the inlet of the reduction furnace through a pipeline, the outlet of the reduction furnace is connected to the inlet of the second filter, the outlet of the second filter is respectively connected to the fifth connection point and the seventh connection point through pipelines, the sixth connection point is connected to a first vent pipeline, the eighth connection point is connected to the inlet of the first chromatographic column through a pipeline, the third connection point is connected to a reduction gas delivery pipeline, the fourth connection point is connected to a second vent pipeline, the ninth connection point is connected to a second carrier gas delivery pipeline, and the tenth connection point is connected to a third vent pipeline; The four-way valve is provided with four connection points arranged in a ring in sequence. When the four-way valve switches between two connection states, each connection point is selectively connected to its adjacent connection point. The outlet of the first chromatographic column is connected to the first connection point through a pipeline, the second connection point is connected to the inlet of the second chromatographic column, the second chromatographic column is connected to the mass spectrometer through a first open splitter, the third connection point is connected to a third carrier gas delivery pipeline, and the fourth connection point is connected to a third vent pipeline.

[0007] In the above technical solution, when the ten-way valve is in the load state, the first connection point is connected to the second connection point, the third connection point is connected to the fourth connection point, the fifth connection point is connected to the sixth connection point, the seventh connection point is connected to the eighth connection point, and the ninth connection point is connected to the tenth connection point; when the ten-way valve is in the addition state, the second connection point is connected to the third connection point, the fourth connection point is connected to the fifth connection point, the sixth connection point is connected to the seventh connection point, the eighth connection point is connected to the ninth connection point, and the tenth connection point is connected to the first connection point.

[0008] In the above technical solution, when the four-way valve is in the load state, the first connection point and the second connection point are connected, and the third connection point and the fourth connection point are connected; when the four-way valve is in the addition state, the first connection point and the fourth connection point are connected, and the second connection point and the third connection point are connected.

[0009] In the above technical solution, a first carrier gas delivery pipeline and a first oxygen delivery pipe are connected to the automatic sampler, and a second oxygen delivery pipe is provided on the pipeline between the automatic sampler and the oxidation furnace.

[0010] In the above technical solution, the outlet of the second chromatographic column is connected to the inlet of the first open splitter, and a fourth carrier gas delivery line is also connected to the first open splitter. The outlet of the first open splitter is connected to a mass spectrometer.

[0011] In the above technical solution, a second open splitter is also connected to the mass spectrometer. The outlet of the second open splitter is connected to the inlet of the mass spectrometer. A first line for transporting the standard reference gas N2, a second line for transporting the standard reference gas CO2, and a fifth carrier gas delivery line for transporting He carrier gas are respectively connected to the inlet of the second open splitter.

[0012] In the above technical solution, the mass spectrometer is a gas stable isotope ratio mass spectrometer.

[0013] In the above technical solution, quartz wool, Cr2O3, and AgCO3O4 are installed in the oxidation furnace.

[0014] In the above technical solution, quartz wool, CuO, and Cu are installed in the reduction furnace.

[0015] In the above technical solution, the first carrier gas delivery line, the first oxygen delivery pipe, the second oxygen delivery pipe, the reducing gas delivery line, the first vent line, the second vent line, the second carrier gas delivery line, the third vent line, the third carrier gas delivery line, the third vent line, the fourth carrier gas delivery line, the first line, the second line, the third carrier gas delivery line, and the connecting pipes are all quartz capillaries.

[0016] On the other hand, the present invention further includes a working method of the separation and drainage type elemental analyzer, comprising the following steps: While the sample to be tested enters the oxidation furnace through an automatic sampler, the ten-way valve A is in a loading state. Combustion oxygen enters the oxidation furnace through the first oxygen delivery pipe. The sample is pyrolyzed at high temperature in a hyperoxic environment. He carrier gas enters the automatic sampler through the first carrier gas delivery line. The formed mixed gas containing C and N components and water vapor is transported by the He carrier gas, filtered through the first filter, and then enters the reduction furnace through the first connection point and the second connection point of the ten-way valve. Among them, the mixed gas containing C and N components is reduced to CO2 and N2 in the reduction furnace. Then, CO2, N2, and water vapor enter the first chromatographic column G1 through the seventh connection point and the eighth connection point of the ten-way valve for separation of water vapor and gas components; The separated gas components enter the second chromatographic column through connection with the first and second contacts when the four-way valve B is in the loaded state. After chromatographic separation by the second chromatographic column, CO2 and N2 are rectified by the first open splitter and then introduced into the mass spectrometer. At the same time, the standard reference gas N2 is alternately introduced into the mass spectrometer through the first pipeline, the standard reference gas CO2 through the second pipeline, and the He carrier gas through the third pipeline via the second open splitter to complete the determination of the carbon and nitrogen isotope ratios. After the separated gas components enter the second chromatographic column through connection with the first and second contacts when the four-way valve B is in the loaded state, quickly switch the four-way valve B to the addition state. The first chromatographic column is in the heating state. At this time, the helium carrier gas transported through the first carrier gas delivery pipeline carries the water vapor generated after water-vapor separation by the first chromatographic column and is discharged through the connection of the first and fourth contacts of the four-way valve and through the third vent pipeline. When the ten-way valve A is in the addition state, the reducing gas H2 passes through the reducing gas delivery pipeline, the third connection point, the second connection point, the reduction furnace, and the second filter, and then enters the seventh and sixth connection points to complete the regeneration of the packing in the reduction furnace; O2 enters the oxidation furnace through the second oxygen delivery pipe, and is connected to the first filter, the first connection point, and the tenth connection point to supply oxygen to the packing of the oxidation furnace C.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. While the present invention completes the analysis and determination of the isotope abundances of organic carbon and nitrogen, it can quickly discharge the water vapor in the system through separation, improve the analysis accuracy, effectively ensure repeatability, reduce the consumption of consumables, improve the detection efficiency, and improve the control accuracy and reliability of the instrument. 2. The present invention separates and discharges the water vapor in the system in a timely manner through the combination of the first chromatographic column, the second chromatographic column, the ten-way valve, and the four-way valve. The drainage is rapid, avoiding the possible influence caused by incomplete removal of water vapor, and the test results are more accurate. 3. The present invention effectively avoids the possible influence caused by the use of adsorbents and also removes the functional limitations during the use of the electric cold trap, making the test results more accurate, the test process and operation more convenient, effectively improving the accuracy of the test values, and having good application and promotion value. Brief Description of the Drawings

[0018] Figure 1 Shown is a schematic diagram of the test process of the separation and drainage type elemental analyzer (the ten-way valve is in the loaded state, and the four-way valve B is in the loaded state).

[0019] Figure 2 Shown is a schematic diagram of the test process of the separation and drainage type elemental analyzer (the ten-way valve is in the loaded state, and the four-way valve B is in the addition state).

[0020] Figure 3 The figure shows a schematic diagram of the drainage process of a separation and drainage type elemental analyzer (the ten-way valve is in the addition state, and the four-way valve B is in the load state).

[0021] Figure 4 The figure shows a schematic diagram of the drainage process of a separation and drainage type elemental analyzer (the ten-way valve is in the addition state, and the four-way valve B is in the addition state).

[0022] Figure 5 The figure shows a schematic diagram of the second open splitter.

[0023] In the figure: A - ten-way valve, B - four-way valve, C - oxidation furnace, D - reduction furnace, E1 - first filter, E2 - second filter, F1 - first open splitter, F2 - second open splitter, G1 - first chromatographic column, G2 - second chromatographic column, H - automatic sampler, I - mass spectrometer; a1 - first connection point, a2 - second connection point, a3 - third connection point, a4 - fourth connection point, a5 - fifth connection point, a6 - sixth connection point, a7 - seventh connection point, a8 - eighth connection point, a9 - ninth connection point, a10 - tenth connection point; b1 - first contact point, b2 - second contact point, b3 - third contact point, b4 - fourth contact point; 1 - first carrier gas delivery pipeline, 2 - first oxygen delivery pipe, 3 - second oxygen delivery pipe, 4 - reducing gas delivery pipeline, 5 - first vent pipeline, 6 - second vent pipeline, 7 - second carrier gas delivery pipeline, 8 - third vent pipeline, 9 - third carrier gas delivery pipeline, 10 - third vent pipeline, 11 - fourth carrier gas delivery pipeline, 12 - first pipeline, 13 - first pipeline, 14 - third carrier gas delivery pipeline. Detailed implementation manners

[0024] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Embodiment 1 A separation and drainage type elemental analyzer includes a ten-way valve A, a four-way valve B, an oxidation furnace C, a reduction furnace D, a first filter E1, a second filter E2, a first open splitter F1, a second open splitter F2, a first chromatographic column G1, a second chromatographic column G2, an automatic sampler H, and a mass spectrometer I, wherein: The outlet of the automatic sampler H is connected to the inlet of the oxidation furnace C through a pipeline, and the outlet of the oxidation furnace C is connected to the inlet of the first filter E1 through a pipeline; The ten-way valve A is provided with ten connection points, namely the first connection point a1, the second connection point a2, the third connection point a3, the fourth connection point a4, the fifth connection point a5, the sixth connection point a6, the seventh connection point a7, the eighth connection point a8, the ninth connection point a9, and the tenth connection point a10, which are arranged in a ring in sequence. The outlet of the first filter E1 is connected to the first connection point a1 through a pipeline. The second connection point a2 is connected to the inlet of the reduction furnace D through a pipeline. The outlet of the reduction furnace D is connected to the inlet of the second filter E2. The outlet of the second filter E2 is respectively connected to the fifth connection point a5 and the seventh connection point a7 through pipelines. The sixth connection point a6 is connected to the first vent pipeline 5. The eighth connection point a8 is connected to the inlet of the first chromatographic column G1 through a pipeline. The third connection point a3 is connected to the reducing gas delivery pipeline 4. The fourth connection point a4 is connected to the second vent pipeline. The ninth connection point a9 is connected to the second carrier gas delivery pipeline 7. The tenth connection point a10 is connected to the third vent pipeline 8.

[0026] When the ten-way valve A switches between two connection states, each connection point selectively connects with its adjacent connection point. Specifically: As Figure 1 - Figure 2 , when the ten-way valve A is in the load state, the first connection point a1 is connected to the second connection point a2, the third connection point a3 is connected to the fourth connection point a4, the fifth connection point a5 is connected to the sixth connection point a6, the seventh connection point a7 is connected to the eighth connection point a8, and the ninth connection point a9 is connected to the tenth connection point a10. As Figure 3 - Figure 4 , when the ten-way valve A is in the inject state, the second connection point a2 is connected to the third connection point a3, the fourth connection point a4 is connected to the fifth connection point a5, the sixth connection point a6 is connected to the seventh connection point a7, the eighth connection point a8 is connected to the ninth connection point a9, and the tenth connection point a10 is connected to the first connection point a1; The four-way valve B is provided with four connection points, namely the first connection point b1, the second connection point b2, the third connection point b3, and the fourth connection point b4. The outlet of the first chromatographic column G1 is connected to the first connection point b1 through a pipeline. The second connection point b2 is connected to the inlet of the second chromatographic column G2. The second chromatographic column G2 is connected to the mass spectrometer I through the first open splitter F1. The third connection point b3 is connected to the third carrier gas delivery pipeline 9. The fourth connection point b4 is connected to the third vent pipeline 10.

[0027] When the four-way valve B switches between two connection states, each connection point selectively connects with its adjacent connection point. Specifically: As Figure 1 and Figure 3, when the four-way valve B is in the load state, the first contact b1 and the second contact b2 are connected, and the third contact b3 and the fourth contact b4 are connected, as Figure 2 and Figure 4 , when the four-way valve B is in the inject state, the first contact b1 and the fourth contact b4 are connected, and the second contact b2 and the third contact b3 are connected.

[0028] Example 2 Preferably, a first carrier gas delivery line 1 and a first oxygen delivery pipe 2 are connected to the autosampler H, and a second oxygen delivery pipe 3 is provided on the pipeline between the autosampler H and the oxidation furnace C.

[0029] Preferably, the outlet of the second chromatographic column G2 is connected to the inlet of the first open splitter F1. A fourth carrier gas delivery line 11 is also connected to the first open splitter F1, and the outlet of the first open splitter F1 is connected to the mass spectrometer I.

[0030] Preferably, a second open splitter F2 is further connected to the mass spectrometer I. The outlet of the second open splitter F2 is connected to the inlet of the mass spectrometer I. A first pipeline 12 for transporting the standard reference gas N2, a second pipeline 13 for transporting the standard reference gas CO2, and a fifth carrier gas delivery line 14 for transporting the He carrier gas are respectively connected to the inlet of the second open splitter F2.

[0031] Preferably, the mass spectrometer I is a gas stable isotope ratio mass spectrometer.

[0032] Preferably, the oxidation furnace C is filled with quartz wool, Cr2O3, and AgCO3O4.

[0033] Preferably, the reduction furnace D is filled with quartz wool, CuO, and Cu.

[0034] Preferably, the first carrier gas delivery line 1, the first oxygen delivery pipe 2, the second oxygen delivery pipe 3, the reducing gas delivery line 4, the first vent line 5, the second vent line 6, the second carrier gas delivery line 7, the third vent line 8, the third carrier gas delivery line 9, the third vent line 10, the fourth carrier gas delivery line 11, the first pipeline 12, the second pipeline 13, the third carrier gas delivery line 14, and the connecting pipelines are all quartz capillaries.

[0035] Example 3 Taking the test process of the carbon and nitrogen element isotope ratios in urea (the sample to be tested) as an example, the working method of the separation and drainage type elemental analyzer described in Example 1 or 2 is described.

[0036] As Figure 1As shown, while the urea (sample to be tested) tightly wrapped by the tin boat enters the oxidation furnace C through the auto sampler H, the ten-way valve A is in the load state. The combustion oxygen enters the oxidation furnace C through the first oxygen delivery pipe 2 and the auto sampler H. The sample instantaneously decomposes at high temperature (about 1800 degrees) in a peroxy environment. The He carrier gas enters the auto sampler H through the first carrier gas delivery pipeline 1. The formed mixed gas containing C and N components and water vapor are transported by the He carrier gas, and after being filtered by the first filter E1, enter the reduction furnace D through the first connection point a1 and the second connection point a2 of the ten-way valve A. The mixed gas containing C and N components is reduced to CO2 and N2 in the reduction furnace D (850 degrees). Then, CO2, N2 and water vapor enter the first chromatographic column G1 (at room temperature) through the connection of the seventh connection point a7 and the eighth connection point a8 of the ten-way valve A for the separation of water vapor and gas components.

[0037] The separated gas components enter the second chromatographic column G2 (80 degrees) through the connection with the first contact point b1 and the second contact point b2 when the four-way valve B is in the load state. After chromatographic separation by the second chromatographic column G2, CO2 and N2 are rectified by the first open splitter F1 and then introduced into the mass spectrometer I. At the same time, the standard reference gas N2 is alternately introduced into the mass spectrometer I through the first pipeline 12, the standard reference gas CO2 through the second pipeline 13, and the He carrier gas through the third pipeline 14 by the second open splitter F2 to complete the determination of the carbon and nitrogen isotope ratios. After the separated gas components enter the second chromatographic column G2 through the connection with the first contact point b1 and the second contact point b2 when the four-way valve B is in the load state, as Figure 2 shown, the four-way valve B is quickly switched to the inject state, and the first chromatographic column G1 is in the heating state (200 degrees). At this time, the helium carrier gas transported through the first carrier gas delivery pipeline 1 carries the water vapor generated after the separation of water and gas by the first chromatographic column G1 and is discharged through the connection of the first contact point b1 and the fourth contact point b4 of the four-way valve B and through the third vent pipeline 10. This design of the separation and drainage method can quickly discharge the water vapor generated during the reaction in a timely manner, and at the same time realize the analysis and testing of the urea sample, reducing the influence of the cumulative effect of water vapor.

[0038] As Figure 3As shown, when the ten-way valve A is in the "inject" state, the reducing gas H2 passes through the reducing gas delivery pipeline 4, the third connection point a3, the second connection point a2, the reduction furnace D, and the second filter E2, and then enters the seventh connection point a7 and the sixth connection point a6 to complete the regeneration of the packing in the reduction furnace D; O2 enters the oxidation furnace C, the first filter E1, the first connection point a1, and the tenth connection point a10 through the second oxygen delivery pipe 3 to supply oxygen to the packing in the oxidation furnace C. (For the specific method, reference can be made to the Chinese patent "Online regeneration experimental method for the packing used in organic carbon and nitrogen analyzers" with the patent number ZL201410619500.3).

[0039] The design of this separation and drainage type elemental analyzer is applicable to samples from different sources such as soil, plants, fish, feathers, etc. The analysis and test process of their organic carbon and nitrogen isotopes is the same as above. When the contents of C and N in the sample vary greatly, in order to improve the test accuracy, only a single test of either the C or N element is selected each time.

[0040] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A separation drainage element analyzer, characterized in that: It includes a ten-way valve, a four-way valve, an oxidation furnace, a reduction furnace, a first filter, a second filter, a first open splitter, a first chromatographic column, a second chromatographic column, an automatic sampler and a mass spectrometer, wherein: The outlet of the automatic sample injector is connected to the inlet of the oxidation furnace through a pipeline, and the outlet of the oxidation furnace is connected to the inlet of the first filter through a pipeline; The ten-way valve is provided with ten connection points arranged in a ring in sequence. When the ten-way valve switches between two connection states, each connection point is selectively connected to its adjacent connection point. The outlet of the first filter is connected to the first connection point through a pipeline, and the second connection point is connected to the inlet of the reduction furnace through a pipeline. The outlet of the reduction furnace is connected to the inlet of the second filter, and the outlet of the second filter is connected to the fifth connection point and the seventh connection point through pipelines respectively. The sixth connection point is connected to the first venting pipeline, and the eighth connection point is connected to the inlet of the first chromatographic column through a pipeline; the third connection point is connected to the reducing gas delivery pipeline, and the fourth connection point is connected to the second venting pipeline; the ninth connection point is connected to the second carrier gas delivery pipeline, and the tenth connection point is connected to the third venting pipeline; The four-way valve is provided with four contacts arranged in a circular pattern in sequence. When the four-way valve switches between two connection states, each contact is selectively connected with its adjacent contact. The outlet of the first chromatographic column is connected to the first contact through a pipeline, the second contact is connected to the inlet of the second chromatographic column, the second chromatographic column is connected to the mass spectrometer through a first open splitter, the third contact is connected to the third carrier gas delivery pipeline, and the fourth contact is connected to the third vent pipeline.

2. The separation drainage type element analyzer according to claim 1, characterized in that: When the ten-way valve is in a load state, the first connection point is connected to the second connection point, the third connection point is connected to the fourth connection point, the fifth connection point is connected to the sixth connection point, the seventh connection point is connected to the eighth connection point, and the ninth connection point is connected to the tenth connection point; when the ten-way valve is in an adding state, the second connection point is connected to the third connection point, the fourth connection point is connected to the fifth connection point, the sixth connection point is connected to the seventh connection point, the eighth connection point is connected to the ninth connection point, and the tenth connection point is connected to the first connection point.

3. The separation drainage type element analyzer according to claim 1, characterized in that: When the four-way valve is in a load state, the first connection point and the second connection point are connected, and the third connection point and the fourth connection point are connected; when the four-way valve is in an adding state, the first connection point and the fourth connection point are connected, and the second connection point and the third connection point are connected.

4. The separation drainage type element analyzer according to claim 1, characterized in that: The automatic sampler is connected to a first carrier gas delivery pipeline and a first oxygen delivery pipe, and a second oxygen delivery pipe is arranged on the pipeline between the automatic sampler and the oxidation furnace.

5. The separation drainage type element analyzer according to claim 4, characterized in that: The outlet of the second chromatographic column is connected to the inlet of the first open splitter, a fourth carrier gas delivery pipeline is also connected to the first open splitter, and the outlet of the first open splitter is connected to a mass spectrometer.

6. The separation drainage type element analyzer according to claim 5, characterized in that: The mass spectrometer is also connected to a second open splitter, the outlet of the second open splitter is connected to the inlet of the mass spectrometer, and the inlet of the second open splitter is respectively connected to a first pipeline for conveying standard reference gas N2, a second pipeline for conveying standard reference gas CO2, and a fifth carrier gas conveying pipeline for conveying He carrier gas.

7. The separation drainage type element analyzer according to claim 1, characterized in that: The mass spectrometer is a gas stable isotope ratio mass spectrometer.

8. The separation drainage type element analyzer according to claim 1, characterized in that: The oxidation furnace is filled with quartz wool, Cr2O3 and AgCO3O4.

9. The separation drainage type element analyzer according to claim 1, characterized in that: The reduction furnace is filled with quartz wool, CuO and Cu.

10. The separation drainage type element analyzer according to claim 6, characterized in that: The first carrier gas delivery pipeline, the first oxygen delivery pipeline, the second oxygen delivery pipeline, the reducing gas delivery pipeline, the first vent pipeline, the second vent pipeline, the second carrier gas delivery pipeline, the third vent pipeline, the third carrier gas delivery pipeline, the third vent pipeline, the fourth carrier gas delivery pipeline, the first pipeline, the second pipeline, the third carrier gas delivery pipeline and the pipelines used for connection are all quartz capillaries.

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