Total organic carbon detection device

Abstract

The utility model provides a total organic carbon detection device which is characterized in that a sealing cover is arranged in a sample introduction unit, a container for containing a water sample is arranged in a closed space defined by the sealing cover, when the total organic carbon detection device is used, firstly, inert gas or nitrogen is used for exhausting air in the sealing cover, and air in the water sample is exhausted; the method comprises the following steps: taking water as a water sample, then burning in an oxygen atmosphere to convert carbon in the water into carbon dioxide gas, and detecting the carbon content in the carbon dioxide gas to obtain TOC in the water sample, so that the influence of the outside on the TOC detection process can be avoided, and the high accuracy of TOC detection is ensured.

Description

TECHNICAL FIELD

[0001] The utility model device belongs to the technical field of material component analysis and test, and particularly relates to a total organic carbon detection device. BACKGROUND

[0002] Total organic carbon (TOC) is the total amount of carbon contained in organic matter in water, expressed in terms of carbon mass concentration (mg / L). Carbon is a common component of all organic matter and the main element that constitutes organic matter. The higher the TOC value of water, the higher the content of organic matter in the water. Therefore, TOC can be used as an index for evaluating the organic pollution of water quality.

[0003] The detection process of TOC is often affected by external factors. For example, exposure of a water sample to air can cause TOC and CO2 in the air to enter the sample; when a plastic container is used to store a water sample, especially a blank sample for low-range TOC detection, the use of a plastic container is avoided because the water in the plastic container can absorb organic matter on the inner wall of the plastic container, and even acid aeration cannot remove the absorbed organic matter. These influences can interfere with the detection results and affect the accuracy of the detection results, especially when the TOC value of the water sample is low or a blank sample for low-range TOC detection is used.

[0004] Therefore, how to avoid the influence of the external environment on the TOC detection process is a guarantee for high accuracy of TOC detection. SUMMARY

[0005] In view of the above technical status, the utility model provides a total organic carbon detection device which can avoid the influence of the external environment on the TOC detection process and ensure high accuracy of TOC detection.

[0006] The technical scheme provided by the utility model is as follows: a total organic carbon detection device comprises a sample inlet unit, a combustion unit, and a non-dispersive infrared detection unit.

[0007] A water sample enters the combustion unit through the sample inlet unit, oxygen is passed through the combustion unit for combustion, and the generated gas enters the non-dispersive infrared detection unit for detection.

[0008] The sample inlet unit comprises a sealing cover and a plurality of open containers, and the containers are used to store water samples.

[0009] The sealing cover surrounds a closed space, and the containers are located in the closed space.

[0010] The sealing cover is provided with a gas outlet.

[0011] The sealing cover is communicated with the first pipeline, the second pipeline and the third pipeline, the first pipeline and the second pipeline are used for conveying inert gas or nitrogen, and the third pipeline is used for conveying the water sample;

[0012] One end of the first pipeline is opened in the sealing cover (marked as A end) and the other end (marked as B end) is opened outside the sealing cover;

[0013] One end of the second pipeline is opened into the container (marked as A end) and the other end (marked as B end) is opened outside the sealing cover;

[0014] One end of the third pipeline is opened into the container (marked as A end) and the other end (marked as B end) is opened into the combustion unit.

[0015] When the depth of the container is large and the diameter is small, preferably, the A end of the second pipeline is communicated with one end of a first needle-shaped pipeline, and the other end of the first needle-shaped pipeline is opened into the container, and further preferably, the A end of the third pipeline is communicated with one end of a second needle-shaped pipeline, and the other end of the second needle-shaped pipeline is opened into the container.

[0016] As an implementation mode, the sample feeding unit further comprises a base for supporting the containers, and preferably, the base is a rotatable base, and as a preferred implementation mode, the sealing cover is buckled on the base, and the sealing cover and the base form the closed space, and preferably, the sealing cover is provided with an openable and closable window for taking out and putting in the water sample.

[0017] Preferably, the A end of the first pipeline is provided with a flow meter for monitoring the flow of the inert gas or nitrogen.

[0018] Preferably, the A end of the second pipeline is provided with a flow meter for monitoring the flow of the inert gas or nitrogen.

[0019] Preferably, the A end of the second pipeline is communicated with the A end of the first pipeline.

[0020] Compared with the prior art, the utility model discloses a sealing cover arranged in the sample feeding unit of the total organic carbon detection device, the container containing the water sample is arranged in the closed space surrounded by the sealing cover, when using, first, the air in the sealing cover is discharged by using the inert gas or nitrogen, and the air in the water sample is discharged, then the carbon in the water is converted into carbon dioxide gas by burning in the oxygen atmosphere, the TOC in the water sample is obtained by measuring the carbon content in the carbon dioxide gas, the influence of the outside on the TOC detection process can be avoided, the high detection accuracy of the TOC is guaranteed, and the lower limit of the TOC content in the water sample detected by the device can be less than 50 μg / L. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the total organic carbon detection device of embodiment 1 of the present application.

[0022] Figure 1 The reference signs in the drawings are: sample injection unit 1, combustion unit 2, non-dispersive infrared detection unit 3; sealing cover 11, container 12, inert gas or nitrogen 13, first pipeline 14, second pipeline 15, third pipeline 16, first needle-shaped pipeline 17, second needle-shaped pipeline 18, base 19, gas outlet 111, window 112, first flow meter 113;

[0023] High-temperature combustion furnace 21, oxygen 22, second flow meter 23, peristaltic pump 24, fourth pipeline 25;

[0024] Non-dispersive infrared detector 31, sixth pipeline 32, waste liquid collection device 33; water sample 100. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in conjunction with embodiments. It should be pointed out that the following described embodiments are intended to facilitate the understanding of the present application, and non-essential improvements and adjustments to the present application made by those skilled in the art based on the content of the present application still fall within the protection scope of the present application.

[0026] In the present application, the words "including", "containing" and similar words should be interpreted as containing the meaning of inclusion rather than exclusive or exhaustive meaning; that is, the meaning of "including but not limited to".

[0027] Embodiment 1:

[0028] In this embodiment, as shown in Figure 1 , the total organic carbon detection device includes a sample injection unit 1, a combustion unit 2 and a non-dispersive infrared detection unit 3.

[0029] The water sample 100 enters the combustion unit 2 through the sample injection unit 1, burns in the combustion unit 2 with oxygen, and the generated gas enters the non-dispersive infrared detection unit 3 for detection.

[0030] The sample injection unit 1 includes a sealing cover 11 and six open containers 12, and the open containers 12 are used to hold the water sample 100.

[0031] The sealing cover 11 encloses a closed space, and the container 12 is located in the closed space.

[0032] The sealing cover 11 is provided with a gas outlet 111.

[0033] The sealed cover 11 is connected with the first pipe 14, the second pipe 15 and the third pipe 16. The first pipe 14 and the second pipe 15 are used to transport inert gas or nitrogen gas 13. The third pipe 16 is used to transport water sample 100 into the combustion unit 2.

[0034] One end of the first pipe 14 is opened in the interior of the sealed cover 11 (marked as A end), and the other end (marked as B end) is opened outside the sealed cover 11.

[0035] One end of the second pipe 15 is opened into the interior of the container 12 (marked as A end), and the other end (marked as B end) is opened outside the sealed cover 11.

[0036] One end of the third pipe 16 is opened into the interior of the container 12 (marked as A end), and the other end (marked as B end) is opened into the combustion unit 2.

[0037] In this embodiment, the container 12 has a large depth and a small diameter, and is in an elongated shape. The A end of the second pipe 15 is connected with one end of the first needle-shaped pipe 17, and the other end of the first needle-shaped pipe 17 is opened into the interior of the container 12. The A end of the third pipe 16 is connected with one end of the second needle-shaped pipe 18, and the other end of the second needle-shaped pipe 18 is opened into the interior of the container 12.

[0038] In this embodiment, the sample feeding unit 1 further comprises a base 19 for supporting the containers 12. In this embodiment, the base 19 is a rotatable base.

[0039] In this embodiment, the base 19 is located in the closed space surrounded by the sealed cover 11. In some embodiments, the sealed cover 11 can also be buckled on the base 19 to form the closed space with the base 19.

[0040] In this embodiment, the sealed cover 11 is provided with an openable and closable window 112 for taking out and putting in the water sample 100.

[0041] The combustion unit 2 comprises a high-temperature combustion furnace 21, a fourth pipe 25 and a fifth pipe 26. One end of the fourth pipe 25 is connected with the high-temperature combustion furnace 21, and the other end is connected with the oxygen gas 22 outside the combustion unit. One end of the fifth pipe 26 is connected with the combustion unit 2, and the other end is connected with the input end of the non-dispersive infrared detector 31. The third pipe 16 is connected with the peristaltic pump 24, and the water sample 100 in the container 12 is transported into the high-temperature combustion furnace 21 of the combustion unit 2 under the pressure of the peristaltic pump 24 through the second needle-shaped pipe 18 and the third pipe 16.

[0042] The non-dispersive infrared detection unit 3 comprises a non-dispersive infrared detector 31 and a sixth pipe 32. One end of the sixth pipe 32 is connected with the output end of the non-dispersive infrared detector 31, and the other end is connected with the collection device 33.

[0043] The oxygen 22 is introduced into the high-temperature combustion furnace 21 through the fourth pipeline 25, and the carbon in the water sample 100 is combusted in the oxygen atmosphere to obtain carbon dioxide in the high-temperature combustion furnace, which is introduced into the non-dispersive infrared detector 31 through the fifth pipeline 26 for detection of the carbon content therein. The output end of the non-dispersive infrared detector 31 is connected to the collecting device 33 through the sixth pipeline 32 for collection of the generated waste liquid and / or waste gas.

[0044] Example 2

[0045] In this embodiment, the total organic carbon detection device in Example 1 is used to detect the TOC content in the water sample 100, and the specific process is as follows:

[0046] (1) The water sample 100 is not diluted, and after acidification, it is placed in a container 12, which is recorded as the a-th container, and then placed on the base 19 through the window 112;

[0047] (2) The outlet 111 is opened, and the outlet valve of the inert gas or nitrogen 13 is opened. The inert gas or nitrogen is introduced into the sealing cover 11 through the first pipeline 14, and the air in the sealing cover is discharged through the outlet 111;

[0048] (3) The first needle-shaped pipeline 17 is inserted into the water sample 100 in the a-th container, and the inert gas or nitrogen is introduced into the first needle-shaped pipeline 17 through the second pipeline, and then introduced into the water sample 100. After the inorganic carbon in the water sample in the a-th container is blown out, it is discharged through the outlet 111;

[0049] (4) The second needle-shaped pipeline 18 is inserted into the water sample 100 in the a-th container, and the peristaltic pump 24 is opened. The water sample 100 in the a-th container is transported to the high-temperature combustion furnace 21 in the combustion unit 2 through the second needle-shaped pipeline 18 and the third pipeline 16 under the pressure of the peristaltic pump 24. The oxygen 22 is introduced into the high-temperature combustion furnace 21 through the fourth pipeline 25, and the carbon in the water sample 100 is combusted in the oxygen atmosphere to obtain carbon dioxide in the high-temperature combustion furnace, which is introduced into the non-dispersive infrared detector 31 through the fifth pipeline for detection of the carbon content therein. The generated waste liquid and / or waste gas is introduced into the collecting device 33 through the sixth pipeline 32.

[0050] The lower limit of the TOC content in the water sample detected by this method can be less than 50 μg / L.

[0051] Example 3

[0052] In this embodiment, the total organic carbon detection device in Example 1 is used to detect the TOC content in the water sample 100, and the specific process is as follows:

[0053] (1) The water sample 100 is first diluted 1000 times with water, and then subjected to acid treatment for removing inorganic carbon therein; then, the water sample 100 subjected to the acid treatment is placed in a container 12, noted as the bth container, and then placed on the base 19 through the window 112.

[0054] (2) The outlet valve of the inert gas or nitrogen 13 is opened, and the inert gas or nitrogen is introduced into the seal cover 11 through the first pipeline 14, and the air in the seal cover is discharged through the air outlet 111;

[0055] (3) The first needle-shaped pipeline 17 is inserted into the water sample 100 in the bth container, and the inert gas or nitrogen is introduced into the first needle-shaped pipeline 17 through the second pipeline 15, and then introduced into the water sample 100, and the inorganic carbon in the water sample in the bth container is blown out and discharged through the air outlet 111;

[0056] (4) The second needle-shaped pipeline 18 is inserted into the water sample 100 in the bth container, and the peristaltic pump 24 is opened, and the water sample 100 in the bth container is transported to the high-temperature combustion furnace 21 in the combustion unit 2 through the second needle-shaped pipeline 18 and the third pipeline 16 under the pressure of the peristaltic pump 24, and the oxygen 22 is introduced into the high-temperature combustion furnace 21 through the fourth pipeline 25, and the carbon in the water sample 100 is combusted in the oxygen atmosphere in the high-temperature combustion furnace to obtain carbon dioxide, which is introduced into the non-dispersive infrared detector 31 through the fifth pipeline for detection, and the carbon content therein is obtained, and the waste liquid and / or waste gas is introduced into the collecting device 33 through the sixth pipeline 32.

[0057] The TOC content in the water sample detected by the method is 60 mg / L.

[0058] The technical scheme of the present application is described in detail in the above embodiment, and it should be understood that the above description is only a specific embodiment of the present application, and is not used to limit the present application, and any modification, supplement or similar replacement within the principle range of the present application should be included in the protection range of the present application.

Claims

1. A total organic carbon detection apparatus characterized by: The device comprises a sample injection unit, a combustion unit and a non-dispersive infrared detection unit. The water sample is injected into the combustion unit through the sample injection unit, and combusted in the presence of oxygen to produce gas which is then detected by the non-dispersive infrared detection unit. The sample injection unit comprises a sealed cover and a plurality of open containers for holding water samples. The sealed cover encloses a closed space in which the containers are located. The sealed cover is provided with an outlet. The sealed cover is connected to a first pipeline, a second pipeline and a third pipeline. The first pipeline and the second pipeline are used for conveying inert gas or nitrogen gas, and the third pipeline is used for conveying the water sample. One end of the first pipeline is an A end, and the other end is a B end. The A end opening is located inside the sealed cover, and the B end opening is located outside the sealed cover.

2. The total organic carbon detection apparatus of claim 1, wherein: One end of the second pipeline is an A end, and the other end is a B end.

3. The total organic carbon detection apparatus of claim 2, wherein: The A end opening of the second pipeline is connected to one end of a first needle-shaped pipeline, and the other end of the first needle-shaped pipeline extends into the container.

4. The total organic carbon detection apparatus of claim 1, wherein: The A end opening of the third pipeline is connected to one end of a second needle-shaped pipeline, and the other end of the second needle-shaped pipeline extends into the container.

5. The total organic carbon detection apparatus of claim 4, wherein: The sample injection unit further comprises a base for supporting the containers.

6. The total organic carbon detection apparatus of claim 5, wherein: The base is a rotatable base.

7. The total organic carbon detection apparatus of claim 1, wherein: The sealed cover is buckled on the base, and the sealed cover and the base form the closed space.

8. The total organic carbon detection apparatus of claim 1, wherein: The sealed cover is provided with an openable window for taking out and putting in the water sample.

9. The total organic carbon detection apparatus of claim 1, wherein: The A end of the first pipeline is provided with a flow meter for monitoring the flow of inert gas or nitrogen gas.

10. The total organic carbon detection apparatus of claim 1, wherein: The A end of the second pipeline is provided with a flow meter for monitoring the flow of inert gas or nitrogen gas. The A end of the second pipeline is connected to the A end of the first pipeline.

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