A method for rapid identification of the source of organic carbon in sediments

Abstract

The present invention discloses a method for rapidly identifying the source of organic carbon in sediments. The method comprises the following steps: S1: Sampling: A portion of the sediment mass is taken as a sample for testing, placed in a crucible, and then placed in a reactor; S2: Heating: The reactor is inserted into a high-temperature tubular furnace and connected to a high-purity oxygen tank, increasing the reactor temperature and releasing carbon dioxide; S3: Recording: An infrared carbon dioxide gas online analyzer records changes in carbon dioxide concentration, and the data change information is transmitted to a display to form a curve image; S4: Determining: By observing the carbon dioxide concentration change curve before and after 400°C, it is determined whether the organic carbon in the sediment is inert or active, and the proportion of different components can be determined. This method for rapidly identifying the source of organic carbon in the sediment uses a step-by-step temperature combustion method to quickly identify the source of organic carbon in the soil carbon reservoir and determine whether it is active or inert organic carbon.

Description

Technical Field

[0001] The present invention relates to the technical field of sediment organic carbon source detection, and in particular to a method for quickly identifying sediment organic carbon sources. Background Art

[0002] Organic carbon in sediments plays an important role in the global carbon pool. The decomposition of organic matter regulates the changes in the earth's climate system. The existing identification methods usually use 14 Using C dating to assess the age of a carbon pool, and further to determine whether it is active or inert, is not a comprehensive assessment; older carbon pools are not necessarily inert. A rapid method is urgently needed to determine whether organic matter in sediments is inert or active. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the shortcomings of the existing technology, the present invention can characterize the biological stability according to the thermal stability, and based on this, a method for rapid identification of the carbon source of sediment organic matter is designed, which solves the problem of the existing identification method usually using 14 C age is used to evaluate the age of the carbon pool, and further to explain whether the carbon pool is active or inert. However, such an evaluation is not comprehensive, and the age of the carbon pool does not necessarily mean that it is inert.

[0005] (2) Technical solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for rapidly identifying the source of organic carbon in sediments, the identification method comprising the following steps:

[0007] S1: Sampling: Take a portion of the sediment as a sample for testing, place the sample in a crucible, and then place it in a reactor;

[0008] S2: Heating: The reactor is inserted into a high-temperature tube furnace and connected to a high-purity oxygen tank. The reactor temperature rises and carbon dioxide is released.

[0009] S3: Recording: The infrared carbon dioxide gas online analyzer records the changes in carbon dioxide concentration, and the data change information is transmitted to the display to form a curve image;

[0010] S4: Judgment: By observing the carbon dioxide concentration change curve before and after 400℃, it can be concluded whether the organic carbon in the sediment is inert or active, and the amount of different components is obtained.

[0011] Through the above technical solution, components containing active organic carbon can be burned at lower temperatures, while components containing inert carbon need to be burned at higher temperatures. By constructing a thermal analysis diagram of the relationship between the amount of carbon dioxide released by the combustion of organic matter in sediments and temperature, the active and inert components in the sediment organic matter and their proportion in the sediment organic matter can be identified.

[0012] Preferably, the identification method further comprises a pressure sensor and a vacuum pump, and the pressure sensor and the vacuum pump are connected to the high-temperature tube furnace through a pipeline.

[0013] The above technical solution can protect the high-temperature tube furnace and prevent accidents.

[0014] Preferably, the pressure sensor is electrically connected to a pressure gauge.

[0015] Through the above technical solution, the use of the pressure gauge can more intuitively observe the internal pressure of the connecting pipe.

[0016] Preferably, in step S1, a crucible is provided inside the reactor, quartz wool is placed on the upper layer inside the crucible, and the sample is laid on the lower layer of the quartz wool.

[0017] Through the above technical solution, quartz wool is provided to prevent the sample from being blown out by oxygen during the oxygen combustion process.

[0018] Preferably, in step S2, a sealing valve is provided between the high-purity oxygen tank and the high-temperature tube furnace, and the high-temperature tube furnace and the temperature controller are electrically connected.

[0019] Through the above technical solution, the sealing valve provided can close the transmission channel between the high-purity oxygen tank and the high-temperature tube furnace.

[0020] Preferably, the temperature controller is set to a heating rate of 5°C / min, and the temperature upper limit is set to 1000°C.

[0021] Through the above technical solution, by using a temperature controller, the temperature is gradually increased, and the amount of carbon dioxide produced can be observed in real time.

[0022] Preferably, in step S4, if the carbon dioxide concentration is high before 400°C, the sample contains a high amount of active organic carbon components; if the carbon dioxide concentration is high after 400°C, the sample contains a high amount of inert organic carbon components.

[0023] Through the above technical solution, compared with the previous 14 C years are used to evaluate the age of the carbon pool. This method can more accurately determine the age of the carbon pool.

[0024] (3) Beneficial effects

[0025] The present invention provides a method for rapidly identifying the source of organic carbon in sediments. It has the following beneficial effects:

[0026] (1) The method for rapid identification of the source of sediment organic carbon. The thermal stability of sediment organic matter can represent biological stability, that is, the lower the decomposition temperature, the poorer the biological stability and the easier it is to decompose. Different components can be separated by burning at different temperatures. Components containing active organic carbon can be burned at a lower temperature (less than 400°C) and converted into carbon dioxide; while components containing inert organic carbon need to be burned at a higher temperature (greater than 400°C) and converted into carbon dioxide. Therefore, the method of gradually increasing the temperature to burn is used to quickly identify the source of organic carbon in the soil carbon pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the method of the present invention;

[0028] Figure 2 It is a schematic diagram of the process of the present invention;

[0029] Figure 3 Schematic diagram of the internal structure of the reactor of the present invention;

[0030] Figure 4 This is a schematic diagram of the thermal analysis of sediment organic matter activity according to the present invention;

[0031] Figure 5 Schematic diagram of the inert thermal analysis of sediment organic matter according to the present invention.

[0032] In the figure: 1. High-purity oxygen tank; 2. Sealing valve; 3. High-temperature tubular furnace; 4. Reactor; 41. Crucible; 42. Quartz wool; 5. Infrared carbon dioxide gas online analyzer; 6. Display; 7. Pressure sensor; 71. Pressure gauge; 8. Vacuum pump. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0035] Example 1, as Figure 1-4 As shown, the present invention provides a technical solution: a method for quickly identifying the source of organic carbon in sediments, comprising the following steps:

[0036] S1: Sampling: taking a portion of the sediment as a sample for testing, and placing the sample in a crucible 41, and then placing it in the reactor 4;

[0037] S2: Heating: The reactor 4 is inserted into the high-temperature tube furnace 3 and connected to the high-purity oxygen tank 1. The temperature of the reactor 4 is increased and carbon dioxide is released;

[0038] S3: Recording: The infrared carbon dioxide gas online analyzer 5 records the change in carbon dioxide concentration, and the data change information is transmitted to the display 6 to form a curve image;

[0039] S4: Judgment: By observing the carbon dioxide concentration change curve before 400°C, it can be determined whether the organic carbon in the sediment is active and the amount of different components can be obtained.

[0040] like Figure 2 The identification method also includes a pressure sensor 7 and a vacuum pump 8. The pressure sensor 7 and the vacuum pump 8 are connected to the high-temperature tube furnace 3 through a pipeline, which can protect the high-temperature tube furnace 3 and prevent accidents.

[0041] like Figure 2 The pressure sensor 7 is electrically connected to the pressure gauge 71. The use of the pressure gauge 71 can more intuitively observe the internal pressure of the connecting pipeline.

[0042] like Figure 3 In step S1, a crucible 41 is provided inside the reactor 4, quartz wool 42 is placed on the upper layer of the crucible 41, and the sample is laid on the lower layer of the quartz wool 42. The quartz wool 42 is provided to prevent the sample from being blown out by oxygen during the oxygen combustion process.

[0043] like Figure 2 In step S2, a sealing valve 2 is provided between the high-purity oxygen tank 1 and the high-temperature tube furnace 3, and the high-temperature tube furnace 3 and the temperature controller 31 are electrically connected. The provided sealing valve 2 can close the transmission channel between the high-purity oxygen tank 1 and the high-temperature tube furnace 3.

[0044] like Figure 2 The temperature controller 31 is set to a heating rate of 5°C / min, and the temperature controller 31 is set to an upper temperature limit of 1000°C. By using the temperature controller 31, the temperature gradually rises, and the amount of carbon dioxide produced can be observed in real time.

[0045] like Figure 4 In step S4, if the carbon dioxide concentration is high before 400°C, the sample contains a high content of active organic carbon components.

[0046] When in use, take out 0.5-0.8g of sample from the sediment and place it in a crucible 41. Cover the upper side of the sample with a layer of quartz wool 42 to prevent the sample from being blown away by oxygen during the combustion process. Connect the high-purity oxygen tank 1 and open the sealing valve 2. Start the temperature controller 31 and set the heating rate of 5℃ / min. Gradually raise the temperature to 1000℃. The organic carbon is oxidized to release carbon dioxide. The concentration change of carbon dioxide during the combustion process is recorded by the infrared carbon dioxide gas online analyzer 5, and a thermal analysis diagram of carbon dioxide concentration relative to temperature is obtained on the display 6, as shown in the attached manual. Figure 4 As shown, the carbon dioxide concentration is high before 400°C, which indicates that the organic matter is active organic carbon.

[0047] Example 2, as Figure 1 、 Figure 2 、 Figure 3 and Figure 5 As shown, the present invention provides a technical solution: a method for quickly identifying the source of organic carbon in sediments, comprising the following steps:

[0048] S1: Sampling: taking a portion of the sediment as a sample for testing, and placing the sample in a crucible 41, and then placing it in the reactor 4;

[0049] S2: Heating: The reactor 4 is inserted into the high-temperature tube furnace 3 and connected to the high-purity oxygen tank 1. The temperature of the reactor 4 is increased and carbon dioxide is released;

[0050] S3: Recording: The infrared carbon dioxide gas online analyzer 5 records the change in carbon dioxide concentration, and the data change information is transmitted to the display 6 to form a curve image;

[0051] S4: Judgment: By observing the carbon dioxide concentration change curve after 400°C, it can be concluded whether the organic carbon in the sediment is inert and the amount of different components can be obtained.

[0052] like Figure 2 The identification method also includes a pressure sensor 7 and a vacuum pump 8. The pressure sensor 7 and the vacuum pump 8 are connected to the high-temperature tube furnace 3 through a pipeline, which can protect the high-temperature tube furnace 3 and prevent accidents.

[0053] like Figure 2 The pressure sensor 7 is electrically connected to the pressure gauge 71. The use of the pressure gauge 71 can more intuitively observe the internal pressure of the connecting pipeline.

[0054] like Figure 3 In step S1, a crucible 41 is provided inside the reactor 4, quartz wool 42 is placed on the upper layer of the crucible 41, and the sample is laid on the lower layer of the quartz wool 42. The quartz wool 42 is provided to prevent the sample from being blown out by oxygen during the oxygen combustion process.

[0055] like Figure 2 In step S2, a sealing valve 2 is provided between the high-purity oxygen tank 1 and the high-temperature tube furnace 3, and the high-temperature tube furnace 3 and the temperature controller 31 are electrically connected. The provided sealing valve 2 can close the transmission channel between the high-purity oxygen tank 1 and the high-temperature tube furnace 3.

[0056] like Figure 2 The temperature controller 31 is set to a heating rate of 5°C / min, and the temperature controller 31 is set to an upper temperature limit of 1000°C. By using the temperature controller 31, the temperature gradually rises, and the amount of carbon dioxide produced can be observed in real time.

[0057] like Figure 5 In step S4, after 400°C, the carbon dioxide concentration is high and the sample contains a high content of inert organic carbon components.

[0058] When in use, take out 0.5-0.8g of sample from the sediment and place it in a crucible 41. Cover the upper side of the sample with a layer of quartz wool 42 to prevent the sample from being blown away by oxygen during the combustion process. Connect the high-purity oxygen tank 1 and open the sealing valve 2. Start the temperature controller 31 and set the heating rate of 5℃ / min. Gradually raise the temperature to 1000℃. The organic carbon is oxidized to release carbon dioxide. The concentration change of carbon dioxide during the combustion process is recorded by the infrared carbon dioxide gas online analyzer 5, and a thermal analysis diagram of carbon dioxide concentration relative to temperature is obtained on the display 6, as shown in the attached manual. Figure 5 As shown, the carbon dioxide concentration is higher after 400°C, thus determining that the organic matter is inert organic carbon. This is the process of using the method for rapid identification of the source of organic carbon in sediments. Meanwhile, any content not described in detail in this specification belongs to the prior art known to professionals in this field.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0060] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for rapidly identifying the source of organic carbon in sediments, characterized by: The identification method comprises the following steps: S1: Sampling: taking a portion of the sediment as a sample for testing, and placing the sample in a crucible (41), and then placing it in a reactor (4); S2: Heating: The reactor (4) is inserted into the high-temperature tube furnace (3) and connected to the high-purity oxygen tank (1). The temperature of the reactor (4) increases and carbon dioxide is released; S3: Recording: The infrared carbon dioxide gas online analyzer (5) records the change in carbon dioxide concentration, and the data change information is transmitted to the display (6) to form a curve image; S4: Judgment: By observing the carbon dioxide concentration change curve before and after 400℃, it is determined whether the organic carbon in the sediment is inert or active, and the amount of different components is obtained; In step S1, a crucible (41) is provided inside the reactor (4), quartz wool (42) is placed on the upper layer inside the crucible (41), and a sample is laid on the lower layer of the quartz wool (42); in step S2, a sealing valve (2) is provided between the high-purity oxygen tank (1) and the high-temperature tube furnace (3), and the high-temperature tube furnace (3) and the temperature controller (31) are electrically connected; in step S4, before 400°C, if the carbon dioxide concentration is high, then the component containing active organic carbon in the sample is high; after 400°C, if the carbon dioxide concentration is high, then the component containing inert organic carbon in the sample is high.

2. The method for rapid identification of the source of organic carbon in sediments according to claim 1, characterized in that: The identification method further comprises a pressure sensor (7) and a vacuum pump (8), wherein the pressure sensor (7) and the vacuum pump (8) are connected to the high-temperature tube furnace (3) via a pipeline.

3. The method for rapid identification of the source of organic carbon in sediments according to claim 2, characterized in that: The pressure sensor (7) is electrically connected to a pressure gauge (71).

4. The method for rapid identification of the source of organic carbon in sediments according to claim 3, characterized in that: The temperature controller (31) is set to a heating rate of 5°C / min, and the temperature controller (31) is set to an upper temperature limit of 1000°C.

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