CN111474002B - Method for in-situ measurement of migration flux of certain dissolved nitrogen at deep water reservoir sediment interface - Google Patents
Method for in-situ measurement of migration flux of certain dissolved nitrogen at deep water reservoir sediment interface Download PDFInfo
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Abstract
The invention discloses a method for in-situ measurement of migration flux of certain dissolved nitrogen at a deep water reservoir sediment interface, which comprises the following steps: manufacturing a device for collecting water and gas on the surface of a deepwater sediment; collecting water and gas substances at a water-mud interface of the deep water reservoir by using a deep water sediment surface water and gas collecting device; and step three, calculating the migration flux of some dissolved nitrogen at the sediment water-mud interface of the deep water reservoir according to the collected result. The method can collect water and gas substances at the water-mud interface of the deep water reservoir in situ, calculate the emigration flux of certain dissolved nitrogen at the interface, provide certain data support for researching the denitrification problem of the reservoir, particularly the deep water reservoir, and has important significance for further researching the denitrification mechanism of the reservoir.
Description
Technical Field
The invention belongs to the technical field of environmental monitoring, relates to the field of water environment, and particularly relates to a method for in-situ measurement of migration flux of certain dissolved nitrogen in a deep water reservoir sediment interface.
Background
Denitrification (Nitrogen loss) refers to the process by which organic or inorganic Nitrogen within a flow field is ultimately converted to a gas and released into the air, since only Nitrogen (N) is present at ambient temperature2) Since inert and harmless gases are involved, the nitrogen removal process by nitrogen generation is considered to be the most effective nitrogen load reduction process. The ecological system balance can be broken by the over-high concentration of the dissolved nitrogen in the ecological system, a series of ecological environment problems are generated, and how to adopt effective measures to reduce the nitrogen pollution load of rivers becomes a common problem in the world today.
The currently approved dissolved nitrogen is directly converted into N2There are two main routes (denitrification process): (ii) Denitrification process (denitrifications): nitrate (NO-3) → Nitrite (NO)- 2) → Nitric Oxide (NO) → nitrous oxide (N)2O)→N2(ii) a ② anaerobic ammonia oxidation process (Anammox): ammonia Nitrogen (NH)4 +)+NO- 2(or NO)- 3)→N2。
Almost every basin in China is built with reservoirs of different sizes, the total number of which is about 10 ten thousand, and the reservoirs (particularly step reservoir groups) inevitably have important influence on the migration and transformation of nitrogen and phosphorus in the basins due to the fact that the runoff process is completely changed, and the reservoirs are highly concerned. However, the related research is very deficient in many China in water reservoirs. At present, the problem of reservoir denitrification is getting more and more attention, and how to accurately and effectively measure the reservoir denitrification rate (mainly the denitrification rate and the anaerobic ammonia oxidation rate) is a key research problem.
There are several ways to determine the denitrification rate, i.e. direct determination of the product, e.g. N2Flux method, N2: ar ratio method, acetylene inhibition method, etc., and there are indirect estimation methods such as nitrogen mass balance method, natural stable nitrogen isotope mass balance method, N index method, etc,15N tracing and pairing technology and the like. The most commonly used methods at present are the acetylene inhibition method and15n tracing and pairing techniques. Acetylene inhibition method and15n tracing and pairing technologies have advantages and disadvantages respectively, but in both methods, sediment samples are collected from a reservoir by using a mud sampler and then are brought back to a laboratory for measurement after culture, and in-situ measurement cannot be realized.
The main problems in the prior art are as follows:
the denitrification reaction is a complex process and is mainly influenced by natural conditions such as water flow, water temperature, nutritive salt, illumination and the like and biological factors such as death, sedimentation, aggregation, predation and the like of algae. The sediment is taken back to a laboratory to measure the denitrification rate and the anaerobic ammonia oxidation rate of the sediment, so that the obtained experimental result has certain reference, the traditional sediment and overlying water collection is carried out by utilizing a columnar mud sampler developed by the Water environmental research institute of the Chinese Water conservancy and hydropower science institute, but the traditional sediment and overlying water collection is easy to disturb the sediment and overlying water in the collection process, and the accuracy of the experiment is disturbed. How to measure the denitrification and anammox rate of the sediments in the reservoir, particularly the deepwater reservoir in situ in the field monitoring process is a key problem for researching the nitrogen circulation and denitrification efficiency of the reservoir. If the nitrogen removal flux can be measured by directly collecting overlying water and gas at the sediment-water interface of the reservoir under the condition of reducing disturbance as much as possible, the method has important significance for further researching the denitrification problem of the sediments of the reservoir, particularly the deepwater reservoir.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for in-situ measurement of a certain dissolved nitrogen migration flux on a deep water reservoir sediment interface, which can be used for in-situ collection of water and gas substances on the deep water reservoir water-mud interface, calculation of the certain dissolved nitrogen migration flux on the interface, provide a certain data support for research on the denitrification problem of a reservoir, particularly the deep water reservoir, and have important significance for further research on the denitrification mechanism of the reservoir.
Therefore, the invention adopts the following technical scheme:
a method for in-situ measurement of a certain dissolved nitrogen emigration flux at a deep water reservoir sediment interface comprises the following steps:
manufacturing a device for collecting water and gas on the surface of a deepwater sediment;
collecting water and gas substances at a water-mud interface of the deep water reservoir by using a deep water sediment surface water and gas collecting device;
and step three, calculating the migration flux of some dissolved nitrogen at the sediment water-mud interface of the deep water reservoir according to the collected result.
Preferably, the deep water sediment surface water and gas collecting device comprises a steel wire rope, a first heavy hammer starter, a device main body, an anti-interference box, a collecting bag, an electronic flowmeter, a second heavy hammer starter and an injector; the device main body comprises a bracket, a flux box covering the sediment and a sinking prevention plate which are welded together; the anti-interference box is provided with an air inlet communicating pipeline and an external communicating pipeline, and the air inlet communicating pipeline and the external communicating pipeline are respectively controlled by a third three-way valve and a first three-way valve; the gas inlet communicating pipe is connected with the collecting bag and is used for collecting gas in the flux box; the collecting bag is provided with a second three-way valve for controlling air inlet and outlet;
the main components of the device are a cylindrical flux box with a slightly higher top and an opening at the bottom, a detachable flexible collecting bag communicated with the top of the flux box through an air inlet communicating pipeline, and a cuboid anti-interference box wrapping the collecting bag; the periphery of the flux box is provided with a sinking resisting plate, and a balance weight is placed on the sinking resisting plate according to the requirement; a third three-way valve which can be inspired by a second heavy hammer starter is arranged on an air inlet communicating pipeline between the collecting bag and the flux box, and an electronic flowmeter is arranged beside the third three-way valve to calculate the air inlet flow; an injector which can be inspired by a second heavy hammer starter is arranged on the flux box; the third three-way valve is connected with the first heavy hammer starter and the second heavy hammer starter, one of the three-way valves is manually triggered after the flux box is settled and stabilized, and enables the flux box to be communicated with the collection bag, and the other one of the three-way valves is automatically started to close the collection bag again when the flux box is lifted through the steel wire rope after monitoring is completed; the tail part of the injector is connected with a second heavy hammer starter and is started simultaneously with a first heavy hammer starter behind a third three-way valve; the upper end of the anti-interference box is communicated with the water body through an external communication pipeline; the whole device is integrated through the bracket, and the steel wire rope is well connected so as to be convenient to operate.
Preferably, the device main body and the interference prevention box are both made of steel plate materials, and the collection bag is made of a flexible polyethylene bag.
Preferably, the flux box is a steel plate material hollow cylinder, the diameter of the flux box is 1000mm, and the thickness of the flux box is 8 mm; the air inlet communicating pipeline is a cylindrical hollow channel, the height of the air inlet communicating pipeline is 60mm, and the diameter of the air inlet communicating pipeline is 20 mm;
the anti-interference box is a hollow cuboid made of a steel plate material, the length of the anti-interference box is 300mm, the width of the anti-interference box is 200mm, the height of the anti-interference box is 200mm, the thickness of the anti-interference box is 8mm, the bottom of the anti-interference box is a circular hole, the anti-interference box is connected with an air inlet communicating pipeline, and the diameter of the hole is 20; the upper part of the pipeline is connected with an external communication pipeline, is a square channel with the length and width of 20mm and the height of 40mm, and is controlled by a first three-way valve to be communicated with the upper part and the lower part;
the volume of the collecting bag is set according to the requirement.
Preferably, the process of step two is as follows:
2.1, collecting the water covered on the undercurrent zone by using a columnar mud sampler and dividing the undercurrent zone into two parts, wherein one part is brought back to a laboratory for dissolved nitrogen determination, the other part is put into an uninstalled collecting bag, all gas in the collecting bag is emptied by using water pressure, and a third three-way valve is closed;
2.2, the collection bag is placed into an anti-interference box, the anti-interference box is arranged on the flux box, the remaining two communication openings of a third three-way valve of the collection bag are ensured to enable the flux box to be communicated inside and outside, the injector is emptied of air, the third three-way valve and the injector are connected with a second heavy hammer starter, and the anti-interference box is filled with water;
2.3, slowly putting the whole deepwater sediment surface water and gas collecting device under water by using an electric winch, and marking that the steel wire rope is not stressed any more after the flux box is unchanged in the sediment surface position and the flux box water body is emptied; putting a first heavy hammer starter along the steel wire rope, starting a first trigger device of a third three-way valve and connecting a collection bag with a flux box;
2.4, after the time required to be measured is reached, lifting the steel wire rope, automatically starting a second heavy hammer starter, automatically extracting the upper cover water by using an injector, and automatically closing a collecting bag;
and 2.5, lifting the deepwater sediment surface water and gas collecting device out of the water surface, taking down the collecting bag and measuring the volume of the residual water body of the anti-interference box, thereby realizing the collection work of water-mud interface water and gas substances of the deepwater reservoir.
Preferably, in the third step, the migration flux of some dissolved nitrogen at the sediment water-mud interface of the deep water reservoir is calculated according to the mass conservation law as follows:
the total flux of gaseous nitrogen is as follows:
wherein the upper conical volume of the flux box is VdThe area of the bottom surface is S, and the volume of the anti-interference box is VcThe volume of the initial water body (initial upper water) of the collecting bag is Vb0The initial concentration of dissolved nitrogen in the initial overlying water is Cl0The initial water volume of the anti-interference box is Vc-Vb0After time t, the collection bag is not filled, and the volume of the water in the collection bag is VbtA certain dissolved nitrogen concentration is CbtThe concentration of dissolved nitrogen in the injector is CltThe volume of the water body of the anti-interference box is VctThe mass concentration of gaseous nitrogen is Pt。
Preferably, the overlying water soluble nitrogen is predominantly
And
gaseous nitrogen is mainly N2And N2O; in a water body
And
measuring by spectrophotometry; n is a radical of2And N2O was measured using an isotope ratio mass spectrometer under a high purity helium atmosphere.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method can collect water and gas substances at the water-mud interface of the deep water reservoir in situ, calculate the emigration flux of certain dissolved nitrogen at the interface, provide certain data support for researching the denitrification problem of the reservoir, particularly the deep water reservoir, and has important significance for further researching the denitrification mechanism of the reservoir.
(2) Simple structure, convenient use and accurate measuring result.
Drawings
FIG. 1 is a schematic structural diagram of a surface water and gas collecting device of a deepwater sediment in the method for in-situ measuring the emigration flux of dissolved nitrogen at the sediment interface of a deepwater reservoir provided by the invention.
FIG. 2 is a schematic structural diagram of the device body in the surface water and gas collecting device of the deepwater sediment.
Fig. 3 is a schematic view of the structure of the tamper-proof box.
Fig. 4 is a schematic view of the structure of the collection bag.
Description of reference numerals: 1. a wire rope; 2. a first weight dropper actuator; 3. a device main body; 4. a support; 5. a first three-way valve; 6. an external communicating pipeline; 7. an anti-interference box; 8. a collection bag; 9. a second three-way valve; 10. balancing weight; 11. a sinking prevention plate; 12. a flux box; 13. an electronic flow meter; 14. an air intake communicating pipe; 15. a third three-way valve; 16. a second hammer actuator; 17. a syringe.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are provided for illustration only and are not to be construed as limiting the invention.
Examples
The invention discloses a method for in-situ measurement of migration flux of certain dissolved nitrogen at a deep water reservoir sediment interface, which comprises the following steps:
manufacturing a device for collecting water and gas on the surface of a deepwater sediment;
collecting water and gas substances at a water-mud interface of the deep water reservoir by using a deep water sediment surface water and gas collecting device;
and step three, calculating the migration flux of some dissolved nitrogen at the sediment water-mud interface of the deep water reservoir according to the collected result.
The device for collecting water and gas on the surface of the deep water sediment is shown in figure 1, the device main body is shown in figure 2, the anti-interference box is shown in figure 3, and the collecting bag is shown in figure 4.
Specifically, the device for collecting water and gas on the surface of the deepwater sediment comprises a steel wire rope 1, a first weight starter 2, a device body 3, an anti-interference box 7, a collection bag 8, an electronic flowmeter 13, a second weight starter 16 and an injector 17; the device main body 3 comprises a bracket 4, a flux box 12 covering the sediment and a sinking resistant plate 11 which are welded together to form the device main body; the counter weight 10 can be added on the anti-sinking plate 11 according to the water depth requirement, so that the flux box 12 is ensured to be in good contact with the sediment; the interference prevention box 7 comprises an air inlet communicating pipeline 14 and an external communicating pipeline 6 which are respectively controlled by a third three-way valve 15 and a first three-way valve 5; the air inlet communicating pipe 14 is connected with the collecting bag 8 and is used for collecting the air in the flux box 12, and the collecting bag 8 is also provided with a second three-way valve 9 for controlling air inlet and outlet.
The device main body 3 and the interference prevention box 7 are both made of steel plate materials, and the collection bag 8 is made of a flexible polyethylene bag.
The flux box 12 is a hollow cylinder made of a steel plate material, the diameter of the hollow cylinder is 1000mm, the thickness of the hollow cylinder is 8mm, the air inlet communicating pipeline 14 is a cylindrical hollow channel, the height of the hollow cylinder is 60mm, and the diameter of the hollow cylinder is 20 mm.
The anti-interference box 7 is a hollow cuboid made of a steel plate material, the length of the anti-interference box is 300mm, the width of the anti-interference box is 200mm, the height of the anti-interference box is 200mm, the thickness of the anti-interference box is 8mm, the bottom of the anti-interference box is a circular hole and is connected with the flux box air inlet communication channel 14, and the diameter of the hole is 20 mm. The upper part is connected with an external communication pipeline 6, is a square channel with the length and width of 20mm and the height of 40mm, and is controlled by a first three-way valve 5 to be communicated with the upper part and the lower part.
The collecting bag 8 is a flexible polyethylene bag, the volume can be made according to the requirement, and the collecting bag is controlled by a second three-way valve 9.
The main components of the device are a cylindrical flux box 12 with a slightly higher top and an opening at the bottom, a detachable flexible collecting bag 8 communicated with the top of the flux box through an air inlet communicating pipeline 14, and a cuboid interference prevention box 7 wrapping the collecting bag; in order to ensure that the water and gas collecting device on the surface of the deepwater sediment can be stably positioned on the surface layer of the sediment without sinking, the periphery of the flux box 12 is provided with a sinking-resisting plate 11, and a counterweight 10 can be placed on the sinking-resisting plate 11 according to the requirement; a third three-way valve 15 which can be triggered by a second weight actuator 16 is arranged on an air inlet communication pipe 14 between the collecting bag 8 and the flux box 12, and an electronic flowmeter 13 is arranged beside the third three-way valve to calculate the air inlet flow. An injector 17 which can be triggered by a second weight actuator 16 is arranged on the flux box 12; the third three-way valve 15 is connected with two starters (a first heavy hammer starter 2 and a second heavy hammer starter 16), one is manually triggered after the flux box 12 is settled and stabilized, and enables the flux box 12 to be communicated with the collection bag 8, and the other is automatically started to close the collection bag 8 again when the flux box is lifted by the steel wire rope 1 after monitoring is finished; the tail part of the injector 17 is connected with a second weight starter 16 and is started simultaneously with a first weight starter 2 behind a third three-way valve 15; the upper end of the anti-interference box 7 is communicated with the water body through an external communication pipeline 6; the whole device is integrated through the bracket 4, and the steel wire rope 1 is connected to the bracket for convenient operation.
The specific method comprises the following steps:
firstly, collecting the water covered on the undercurrent zone by using a columnar mud sampler and dividing the undercurrent zone into two parts, wherein one part is taken back to a laboratory for measuring dissolved nitrogen, the other part is put into an uninstalled collecting bag 8, all gas in the collecting bag 8 is emptied by using water pressure, and a third three-way valve 15 is closed;
secondly, the collection bag 8 is placed into the interference prevention box 7, the interference prevention box 7 is installed on the flux box 12, the remaining two communication openings of a third three-way valve 15 of the collection bag 8 enable the flux box 12 to be communicated with the inside and the outside, meanwhile, an injector 17 is emptied of air, the third three-way valve 15 and the injector 17 are connected with a second hammer starter 16, and meanwhile, the interference prevention box 7 is filled with water;
thirdly, slowly putting the whole deepwater sediment surface water and gas collecting device under water by using an electric winch, putting a first heavy hammer starter 2 along a steel wire rope 1 after the position of a flux box 12 on the sediment surface is unchanged and a water body of the flux box 12 is emptied (marked by the fact that the steel wire rope 1 is not stressed any more), starting a first trigger device of a third three-way valve 15 and connecting a collecting bag 8 with the flux box 12;
fourthly, after the time required to be measured is reached, the steel wire rope 1 is lifted, the second heavy hammer starter 16 is automatically started, the injector 17 automatically extracts the overlying water, and the collecting bag 8 is automatically closed;
and finally, lifting the surface water and gas collecting device of the deep water sediment out of the water surface, taking down the collecting bag 8 and measuring the volume of the residual water body of the anti-interference box 7, thereby realizing the collecting work of water-mud interface water and gas substances of the deep water reservoir.
The water and gas collecting device on the surface of the deep water sedimentAfter field collection, the upper conical volume of the flux box 12 is VdThe bottom surface area is S, and the volume of the anti-interference box 7 is VcThe volume of the initial water body (initial upper water) of the collecting bag 8 is Vb0The initial concentration of dissolved nitrogen in the initial overlying water is Cl0Then the initial water volume of the anti-interference box 7 is Vc-Vb0After a time t (collection bag 8 not filled), the volume of the water in the collection bag 8 is VbtA certain dissolved nitrogen concentration is CbtThe concentration of dissolved nitrogen in the syringe 17 is CltThe volume of the water body of the anti-interference box 7 is VctThe mass concentration of gaseous nitrogen is PtAccording to the mass conservation law, the emigration flux of certain dissolved nitrogen at the sediment water-mud interface of the deepwater reservoir can be calculated as follows:
the total flux of gaseous nitrogen is as follows:
the overlying water soluble nitrogen is mainly nitrate
Nitrite salt
And ammonia nitrogen
The gaseous nitrogen is mainly nitrogen (N)2) And nitrous oxide (N)2O). In a water body
And
spectrophotometry was used according to Water and wastewater monitoring and analysis method (fourth edition) (supplementary edition)Measuring by a method; n is a radical of2And N2O was measured using an isotope ratio mass spectrometer (ThermoFisher/Delta V Advantage) under a high purity helium (99.9999%) environment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and scope of the present invention are intended to be covered thereby.
Claims (6)
1. A method for in-situ measurement of a certain dissolved nitrogen migration flux at a deep water reservoir sediment interface is characterized by comprising the following steps:
manufacturing a device for collecting water and gas on the surface of a deepwater sediment;
collecting water and gas substances at a water-mud interface of the deep water reservoir by using a deep water sediment surface water and gas collecting device;
step three, calculating the migration flux of some dissolved nitrogen at the sediment water-mud interface of the deep water reservoir according to the collected result;
the device for collecting the water and the gas on the surface of the deep water sediment comprises a steel wire rope (1), a first heavy hammer starter (2), a device main body (3), an anti-interference box (7), a collection bag (8), an electronic flowmeter (13), a second heavy hammer starter (16) and an injector (17); the device main body (3) comprises a bracket (4), a flux box (12) covered on the sediment and a sinking resistant plate (11), and the three are welded together; an air inlet communicating pipeline (14) and an external communicating pipeline (6) are arranged on the anti-interference box (7), and the air inlet communicating pipeline (14) and the external communicating pipeline (6) are respectively controlled by a third three-way valve (15) and a first three-way valve (5); the gas inlet communicating pipe (14) is connected with the collecting bag (8) and is used for collecting gas in the flux box (12); the collection bag (8) is provided with a second three-way valve (9) for controlling air inlet and outlet;
the main components of the device are a cylindrical flux box (12) with a slightly higher top and an opening at the bottom, a detachable flexible collecting bag (8) communicated with the top of the flux box through an air inlet communicating pipeline (14), and a cuboid anti-interference box (7) wrapping the collecting bag (8); the periphery of the flux box (12) is provided with a sinking resisting plate (11), and a balance weight (10) is placed on the sinking resisting plate (11) according to the requirement; a third three-way valve (15) which can be inspired by a second heavy hammer starter (16) is arranged on an air inlet communicating pipe (14) between the collecting bag (8) and the flux box (12), and an electronic flowmeter (13) is arranged beside the third three-way valve to calculate the air inlet flux; an injector (17) which can be triggered by a second weight trigger (16) is arranged on the flux box (12); a third three-way valve (15) is connected with the first heavy hammer starter (2) and the second heavy hammer starter (16), one of the three-way valves is manually triggered after the flux box (12) is settled stably and enables the flux box (12) to be communicated with the collection bag (8), and the other one of the three-way valves is automatically started to close the collection bag (8) again when the flux box (12) is lifted through the steel wire rope (1) after monitoring is finished; the tail part of the injector (17) is connected with a second weight starter (16) and is started simultaneously with a first weight starter (2) behind a third three-way valve (15); the upper end of the anti-interference box (7) is communicated with the water body through an external communication pipeline (6); the whole device is integrated through the bracket (4), and the steel wire rope (1) is well linked for convenient operation.
2. The method for in-situ determination of the migration flux of some dissolved nitrogen at the deep water reservoir sediment interface according to claim 1, characterized by comprising the following steps: the device main body (3) and the interference prevention box (7) are both made of steel plate materials, and the collection bag (8) is made of a flexible polyethylene bag.
3. The method for in-situ determination of the migration flux of some dissolved nitrogen at the deep water reservoir sediment interface according to claim 1, characterized by comprising the following steps: the flux box (12) is a steel plate material hollow cylinder, the diameter of the flux box is 1000mm, and the thickness of the flux box is 8 mm; the air inlet communicating pipeline (14) is a cylindrical hollow channel with the height of 60mm and the diameter of 20 mm;
the anti-interference box (7) is a hollow cuboid made of a steel plate material, is 300mm long, 200mm wide, 200mm high and 8mm thick, is provided with a circular hole at the bottom, is connected with the air inlet communicating pipeline (14), and has the diameter of 20 mm; the upper part of the pipeline is connected with an external communicating pipeline (6), is a square channel with the length and width of 20mm and the height of 40mm, and is controlled by a first three-way valve (5) to be communicated with the upper part and the lower part;
the volume of the collecting bag (8) is set according to the requirement.
4. The method for in-situ measurement of the migration flux of dissolved nitrogen at the deep water reservoir sediment interface according to any one of claims 1 to 3, wherein the process of the second step is as follows:
2.1, collecting the water covered on the undercurrent zone by using a columnar mud sampler and dividing the undercurrent zone into two parts, wherein one part is brought back to a laboratory for measuring dissolved nitrogen, the other part is put into an uninstalled collecting bag (8), all gas in the collecting bag (8) is emptied by using water pressure, and a third three-way valve (15) is closed;
2.2, the collection bag (8) is placed into the interference prevention box (7), the interference prevention box (7) is installed on the flux box (12), the remaining two communication openings of the third three-way valve (15) of the collection bag (8) enable the flux box (12) to be communicated inside and outside, meanwhile, the injector (17) is emptied of air, the third three-way valve (15) and the injector (17) are connected with the second hammer starter (16), and meanwhile, the interference prevention box (7) is filled with water;
2.3, slowly putting the whole deepwater sediment surface water and gas collecting device under water by using an electric winch, and marking that the steel wire rope (1) is not stressed any more after the flux box (12) is unchanged in the sediment surface position and the water body of the flux box (12) is emptied; a first weight starter (2) is placed along the steel wire rope (1), a first trigger device of a third three-way valve (15) is started, and a collection bag (8) is connected with a flux box (12);
2.4, after the time required to be measured is reached, lifting the steel wire rope (1), automatically starting a second heavy hammer starter (16), automatically extracting the upper cover water by using an injector (17), and automatically closing a collecting bag (8);
and 2.5, lifting the surface water and gas collecting device of the deep water sediment out of the water surface, taking down the collecting bag (8) and measuring the volume of the residual water body of the anti-interference box (7), thereby realizing the collecting work of water-mud interface water and gas substances of the deep water reservoir.
5. The method for in-situ determination of the migration flux of dissolved nitrogen at the interface of deep water reservoir sediments according to any one of claims 1-3, characterized by comprising the following steps: in the third step, the emigration flux of certain dissolved nitrogen at the sediment water-mud interface of the deep water reservoir is calculated according to the mass conservation law as follows:
the total flux of gaseous nitrogen is as follows:
wherein the upper part of the flux box (12) has a conical volume VdThe area of the bottom surface is S, and the volume of the anti-interference box (7) is VcThe initial water volume of the collecting bag (8) is Vb0The initial concentration of dissolved nitrogen in the initial overlying water is Cl0The initial water volume of the anti-interference box (7) is Vc-Vb0After a time t, the collection bag (8) is not filled, and the volume of the water in the collection bag (8) is VbtA certain dissolved nitrogen concentration is CbtThe concentration of dissolved nitrogen in the injector (17) is CltThe volume of the water body of the anti-interference box (7) is VctThe mass concentration of gaseous nitrogen is Pt。
6. The method for in-situ determination of the migration flux of some dissolved nitrogen at the deep water reservoir sediment interface according to claim 5, characterized by comprising the following steps: the overlying water dissolves nitrogen mainly
And
gaseous nitrogen is mainly N2And N2O; in a water body
And
measuring by spectrophotometry; n is a radical of2And N2O was measured using an isotope ratio mass spectrometer under a high purity helium atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014465.8A CN111474002B (en) | 2020-01-07 | 2020-01-07 | Method for in-situ measurement of migration flux of certain dissolved nitrogen at deep water reservoir sediment interface |
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