CN212646397U - DGT testing device for lake water body - Google Patents
DGT testing device for lake water body Download PDFInfo
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- CN212646397U CN212646397U CN202020024877.5U CN202020024877U CN212646397U CN 212646397 U CN212646397 U CN 212646397U CN 202020024877 U CN202020024877 U CN 202020024877U CN 212646397 U CN212646397 U CN 212646397U
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Abstract
The utility model provides a lake water DGT testing arrangement, include: the floating ball and the water sampling units are arranged on the water sampling pipe; each water sample sampling unit is provided with a DGT detection device, a water quality multi-parameter probe detection device and a water sample collection device; wherein water sample collection system includes: the sampling device comprises a plurality of sampling bottles, wherein each sampling bottle is provided with a sampling pipe and an exhaust pipe; a one-way electromagnetic valve is arranged on each sample inlet pipe and each exhaust pipe; a water sample outlet of the peristaltic pump is respectively communicated with the sampling pipes of the plurality of sampling bottles through a first multi-way joint; meanwhile, the exhaust pipes of the plurality of sampling bottles are connected to an exhaust main pipe through a second multi-way joint; and the control device is connected with the peristaltic pump and each one-way electromagnetic valve. The device can ensure the circular DGT normal position test of lake water multilayer depth of water, and can gather multilayer water sample and survey physicochemical property in step, is applicable to the research of deep water lake section multilayer nutrient element distribution characteristic.
Description
Technical Field
The utility model belongs to lake water eutrophication mechanism and DGT (gradient diffusion film) technical research field, concretely relates to lake water DGT testing arrangement.
Background
DGT (gradient diffusion membrane) technology can be used for monitoring of available metals/nutrient salts/oxyanions in water/sediment/soil. The principle is that DGT measures the amount of solute that diffuses through the diffusion gel and the concentration gradient of the filter membrane, and that the solute is bound by the anchoring gel soon after passing through the diffusion layer of the DGT device, and the anchoring gel is behind the diffusion gel, continuously removing the solute, and maintaining the concentration gradient during operation (Zhang et al, 1995). Based on Fick's first law, the time-averaged flux of DGT (F) and the time-averaged concentration of DGT/solution interface (C) can be calculatedDGT) 。
In the prior art, circular DGT can be generally used for measuring nutrient elements (nitrogen/phosphorus) in lake water bodies, so that the biological effectiveness of the nutrient elements in the water bodies is disclosed. At present, the DGT test method of the lake water body has two types: the first type is that a sampling bottle is used for collecting a lake water sample, and then DGT ectopic test of the water sample is carried out in a laboratory; the second type is that a round DGT is arranged on a testing device, the testing device is placed in a lake water body, and in-situ testing is carried out on the water covered on the surface water or sediment in the water body.
However, the first method described above has the following problems: the physical and chemical properties of the water body of the water sample collected in the laboratory, such as Eh, pH, temperature, conductivity and the like, are changed, which affects the water chemical reaction and the element form, and distorts the element form, the component and the biological effectiveness of the water sample collected in the laboratory. Therefore, the ectopic circular DGT test in the laboratory cannot accurately reflect the on-site element morphology, the biological effectiveness and the physicochemical property of the water sample.
The second method is to realize the in-situ test of the circular DGT in the water body by manufacturing some simple devices. The devices used in the prior art include the following: (1) installing a simple DGT device in the PVC pipe, and putting the PVC pipe into surface water to finish the test of the DGT on the surface water; (2) fixing a walking stick-shaped device on the DGT, wherein the upper end of the device is provided with a round DGT, and the lower end of the device is inserted into the sediment for fixing, so that the test of the water covering on the sediment is realized; (3) circular DGTs were placed in a spindle or plate apparatus for testing for overburden water.
Although the testing device can complete the testing of DGT in surface water or overlying water of a lake, the testing device has the following defects: (1) the function of accurately collecting water samples in a DGT test area at the same time is not provided; water samples can only be collected near the test spot at the beginning or end of the test. The sampling frequency of the water body sampling method is low, so that the analysis result of the water sample cannot be compared with the time integral concentration of the DGT, namely, the biological effectiveness and the nutrition degree of the water body elements cannot be accurately researched by contrasting the average environmental concentration of the DGT and the test results of a plurality of water samples acquired at different times. (2) The existing device can not synchronously measure the physicochemical property of a DGT test area, can only adopt a handheld water quality analyzer to test the surface layer physicochemical property before or after the DGT test, and can not measure the physicochemical properties (Eh, pH, DO, salinity, temperature and the like) of the middle layer water and the overlying water of sediments in situ. The DGT time average concentration is combined with the physicochemical property of a water sample, so that the method is an important method for researching the nutrition mechanism of different water depths.
How the utility model discloses DGT testing arrangement can realize DGT at the normal position test of the three-layer water of surface layer, middle level, deposit overburden water, can gather DGT test area water sample and survey three-layer water physicochemical property of three-layer water simultaneously again, realizes obtaining the DGT concentration of lake water section nitrogen phosphorus synchronously, the water nitrogen phosphorus concentration and the physicochemical property of a plurality of time nodes that conventional analysis method obtained; the research result can reflect the water body nutrition mechanism of different water depths of the lake water body; this is a difficulty in developing a water body DGT in-situ test device.
Disclosure of Invention
The utility model provides a DGT testing arrangement among the prior art can not realize the normal position test of DGT in a plurality of water depth departments, and unable synchronous acquisition DGT test area water sample, the technical problem of unable synchronous determination water physical and chemical properties, and then provide one kind can realize the top layer simultaneously, the middle level, the normal position DGT test of deposit upper cover water three-layer water, obtain the DGT concentration of lake water profile nitrogen phosphorus in step, the DGT testing arrangement of water concentration and physical and chemical properties and synchronous sampling of conventional analytic method.
In order to solve the technical problem, the utility model provides a technical scheme as follows:
a DGT testing device for a lake water body comprises: a floating ball; the water sampling units are sequentially arranged below the floating ball in the vertical direction, and each two adjacent water sampling units and the uppermost water sampling unit and the floating ball are connected through ropes; each water sample sampling unit is provided with a DGT detection device, a water quality multi-parameter probe detection device and a water sample collection device; wherein the water sample collection system includes: the sampling device comprises a plurality of sampling bottles, a sampling tube and an exhaust tube, wherein each sampling bottle is provided with the sampling tube and the exhaust tube; a one-way electromagnetic valve is arranged on each sample inlet pipe and each exhaust pipe; a water sample outlet of the peristaltic pump is respectively communicated with the sampling pipes of the plurality of sampling bottles through a first multi-way joint; meanwhile, the exhaust pipes of the plurality of sampling bottles are connected to an exhaust main pipe through a second multi-way joint; and the control device is connected with the peristaltic pump and the one-way electromagnetic valves on the sampling pipes and the exhaust pipes.
The water sample collection system is provided with integrated sample thief, integrated sample thief includes: the fixing plate is fixedly provided with a power supply and a control device on the bottom surface; the water pump fixing base is positioned below the fixing base and fixedly connected with the fixing plate, and the peristaltic pump is mounted on the water pump fixing base; the electromagnetic valve and the connector fixing ring are positioned below the water pump fixing base and are fixedly connected with the water pump fixing base, the electromagnetic valve and the connector fixing ring are provided with a connecting seat, and the first multi-way connector, the second multi-way connector and the one-way electromagnetic valve are fixedly arranged on the connecting seat; the sampling bottle fixing ring is positioned below the electromagnetic valve fixing ring and is fixedly connected with the electromagnetic valve fixing ring, and a sampling bottle is arranged below the sampling bottle fixing ring; the power supply is respectively connected with the peristaltic pump, the one-way solenoid valve and the control device through leads. The DGT detection device is provided with a DGT fixing ring, a plurality of placing holes are uniformly formed in the circumferential direction of the DGT fixing ring, and a plurality of DGT probes are respectively installed in the placing holes.
The water quality multi-parameter probe detection device comprises a base, wherein a mounting hole is formed in the base, a detection electrode is mounted in the mounting hole, and the detection electrode is fixedly mounted on the mounting hole of the base through an electrode fixing cover plate; a fixed rod is fixedly arranged below the base, and the base of the water quality multi-parameter probe detection device is fixedly arranged above the DGT detection device through the fixed rod; the bottom end probe of the detection electrode penetrates through the DGT fixing ring of the DGT testing device and extends to the lower part of the DGT fixing ring.
The integrated sampler is also provided with a data memory, and the data memory is fixedly arranged on the fixed plate and connected with the detection electrode.
The number of the sampling bottles is four, and the first multi-way joint and the second multi-way joint are all five-way joints; the water sampling unit is provided with three.
The integrated sampler is detachably mounted in the sealed cylinder, and the DGT fixing ring of the DGT detection device is sleeved on the outer wall of the sealed cylinder and is positioned on the upper part of the sealed cylinder.
The DGT detection device is connected with the base of the water quality multi-parameter probe detection device, the exhaust manifold and the water pumping pipe of the peristaltic pump penetrate through the DGT detection device and the water quality multi-parameter probe detection device, and finally reach the base of the water quality multi-parameter probe detection device, and the exhaust port of the exhaust manifold and the water sample inlet of the water pumping pipe are arranged on the upper surface of the base.
Still be provided with the sample thief auxiliary frame, the water sample sampling unit suits to be installed through the detachable mode on the sample thief auxiliary frame.
The testing method based on the DGT testing device for the lake water body comprises the following steps: (1) placing the DGT testing device for the lake water body into the lake water body; (2) carrying out DGT detection on the water body at the depth by using DGT detection devices of the water sample sampling units at different depths, and detecting water quality indexes by using a water quality multi-parameter probe detection device; opening a one-way electromagnetic valve on a sampling tube and an exhaust pipe of a sampling bottle of the water sample collecting device, controlling the action of the one-way electromagnetic valves on the peristaltic pump, the sampling tube and the exhaust pipe by using the control device, and pumping water flow into one sampling bottle at fixed time intervals for sampling; (3) and taking the DGT testing device out of the lake water body, taking out the round DGT and the water sample in the sampling bottle, and processing and analyzing.
The utility model discloses in lake water DGT testing arrangement's advantage lie in:
the utility model discloses in the circular DGT normal position test of lake water three-layer depth of water not only can be ensured to the device, three-layer water sample and survey physicochemical properties (Eh, pH, temperature and conductivity) can be gathered in step moreover to can truly reflect water nitrogen phosphorus or metallic element's bioavailability. The device is provided with a plurality of split test units, can detect water bodies with different heights, thereby realizing a multilayer water body test task and being suitable for the research on the distribution characteristics of multilayer nutrient elements of a deep lake profile. The device is suitable for researching the distribution characteristics of nutrient-rich elements (nitrogen/phosphorus) in the lake water body profile and the nutrition mechanism.
In this embodiment the lake water DGT testing arrangement in sampling bottle be provided with a plurality ofly, water sample collection system is provided with first multi-way joint, one of first multi-way joint connects for the inlet, the inlet communicates with the water sample export of peristaltic pump, other a plurality of joints that first multi-way joint then are the liquid outlet, a plurality of liquid outlets respectively with the inlet pipe intercommunication setting of a plurality of sampling bottles, the blast pipe of sampling pipe is connected to the exhaust manifold through the second multi-way joint on every all be provided with the solenoid valve on blast pipe and the inlet pipe, water sample collection system is provided with controlling means, utilizes controlling means timing control the action of peristaltic pump and solenoid valve can realize gathering a plurality of water samples a day.
In order to make the technical scheme of the DGT testing device for the water body in the lake of the present invention more clearly understood, the following detailed description of the present invention is given by referring to the accompanying drawings and the specific embodiments.
Drawings
FIG. 1 shows the overall structure of the DGT testing device for the water body in the lake of the present invention;
as shown in fig. 2, the overall structure of the water sampling unit of the DGT testing device for water bodies in lakes of the present invention is schematically shown;
fig. 3 is an exploded view of the water sampling unit according to the present invention;
fig. 4 is an exploded view of the integrated sampler according to the present invention;
fig. 5 is a schematic view showing the connection relationship among the multi-way joint, the one-way electric valve and the peristaltic pump of the integrated sampler of the present invention;
fig. 6 is a schematic diagram of the overall structure of the DGT detection device according to the present invention;
FIG. 7 is a partial exploded view of the DGT detecting device of the present invention;
as shown in fig. 8, the water quality multi-parameter probe detection device of the present invention is an explosion diagram;
fig. 9 is a schematic view of the installation of the water sampling unit on the auxiliary frame of the sampler after the sealing cylinder is removed;
wherein the reference numerals are:
1-floating ball; 2-a water sample sampling unit; 4-auxiliary frame of sampler; 5-counterweight chassis;
21-an integrated sampler; 22-DGT detection means; 23-water quality multi-parameter probe detection device;
221-circular DGT; 222-a guide post; 223-DGT fixing ring; 224-electrode mounting base; 225-BPK6 plungers; 227-placement holes;
231-lead of electrode; 232-water quality multi-parameter electrode; 233-electrode fixing cover plate; 234-a base; 235-water sample inlet; 236-top hanging ring; 237-exhaust port; 238-sealing the joint; 239-third O-ring seal; 2310-fixing the rod; 2311-electrode fixation sleeve;
212-a fixed plate; 213-exhaust manifold; 214-first O-ring seal; 215-data memory; 216-suction tube of peristaltic pump; 217-start switch; 218-power supply fixed side plate; 219-switch mounting base; 2110-PLC controller; 2111-power supply; 2112-power fixing block; 2113-first multipass joint; 2114-Water Pump mounting base; 2115-peristaltic pump; 2116-connecting seat; 2117-solenoid valve and joint retainer ring; 2118-one-way solenoid valve; 2119-sample vial retainer ring; 2120-sampling bottle assembly fixing block; 2121-circuit board mounting sleeve; 2122-electromagnetic valve module fixing ring; 2123-fixing base of sampling bottle; 2124-sampling bottle; 2125-rotating the screw; 2126-sealing the cylinder; 2127-a second O-ring; 2128-sealing the bottom cap; 2129-bottom flying ring; 2130-a second multipass joint; 2131-a power supply fixing seat, 2132-a mounting ring for sealing the top end of the bottom cover;
41-holes on the placing ring of the auxiliary frame of the sampler.
Detailed Description
The embodiment provides a DGT testing device for a lake water body, the whole device is made of opaque PVC plastic, foamed plastic, an integrated block, a wire, common plastic, stainless steel and the like, as shown in figure 1, a floating ball 1 is arranged at the top of the device, the diameter of the floating ball 1 is 30 cm, the floating ball 1 is made of the foamed plastic and has certain buoyancy, and the device can be suspended in the water body and can be used for positioning. Three water sampling unit 2 has set gradually from top to bottom along vertical direction in the below of floater 1, is used for detecting the quality of water of top layer water, middle level and lower floor's water in proper order and realizes the DGT test, has set up counter weight chassis 5 in 2 bottoms of water sampling unit of below, between per two adjacent water sampling unit 2 and be located the top all connect through the hawser between water sampling device and the floater 1. In the embodiment, the height of each water sample sampling unit 2 is 51.9 cm, and the maximum external diameter is 23 cm; the diameter of the counterweight chassis 5 is 15 cm, the thickness is 8 cm, the weight is 3 kg, and the counterweight chassis is hung below the third layer of water sample sampling unit 2. When the water sampling device is used, the counterweight chassis 5 is placed on surface sediments, and the depth of the three layers of water sampling units 2 in water is determined by the depth of a lake and cables connected with the three devices.
As shown in fig. 2 and 3, each of the water sampling units 2 is provided with a DGT detection device 22, a water quality multi-parameter probe detection device 23, and a water sample collection device; wherein the water sample collection system includes: a plurality of sampling bottles 2124, each of the sampling bottles 2124 being provided with a sample inlet pipe and an exhaust pipe; a one-way electromagnetic valve 2118 is arranged on each sample inlet pipe and each exhaust pipe; a peristaltic pump 2115, a water sample outlet of the peristaltic pump 2115 is respectively communicated with the sample inlet pipes of the plurality of sampling bottles 2124 through a first multi-way joint 2113; meanwhile, the exhaust pipes of the plurality of sample bottles 2124 are connected to an exhaust manifold 213 through a second multi-way joint 2130; and the control device is connected with the peristaltic pump 2115 and the one-way electromagnetic valve 2118 on each sampling pipe and exhaust pipe. In this embodiment, four sampling bottles 2124 are provided, and the first multi-way joint 2113 and the second multi-way joint 2130 both adopt five-way joints, wherein one joint of the first multi-way joint 2113 is communicated with a water sample outlet of the peristaltic pump 2115, and the other four joints are respectively communicated with sample inlet pipes of the four sampling bottles 2124; one of the second multi-way connectors 2130 is in communication with the exhaust manifold 213, and the other four connectors are in communication with the exhaust pipes of the four sampling bottles 2124, respectively. The connection relationship among the multi-way joint, the one-way solenoid valve and the peristaltic pump is shown in figure 5.
The water sample collection device in this embodiment is provided with an integrated sampler 21, as shown in fig. 4, the integrated sampler 21 includes:
the fixing plate 212 is fixedly provided with a power supply 2111, a control device and a data memory 215 on the bottom surface of the fixing plate 212, the control device is a PLC controller 2110, a mounting hole is formed in the center of the fixing plate 212, a disc-shaped power supply fixing seat 2131 is arranged in the mounting hole of the fixing plate 212, the power supply fixing seat is detachably mounted on the fixing plate 212, specifically, the power supply fixing seat is fixed on the fixing plate 212 through a screw, and a first O-ring 214 is arranged at the joint of the power supply fixing seat 2131 and the mounting hole of the fixing plate 212. The power supply 2111 is fixedly mounted on the power supply fixing seat 2131 through power supply fixing side plates 218, the power supply fixing side plates 218 are located at two sides of the power supply 2111, and a power supply fixing block 2112 is further arranged between each power supply fixing side plate 218 and the power supply 2111; the circuit board of the PLC controller 2110 is vertically disposed and fixed to the outer wall of the power fixing side plate 218 through the circuit board mounting sleeve 2121, the power supply 2111 is further provided with a start switch 217, the switch is fixedly mounted on the fixing plate 212 through a switch mounting base 219, and the power supply 2111 is connected to the control device 2110 and the data storage 215.
The water pump fixing base 2114 is located below the fixing plate 212 and is fixedly connected with the fixing plate 212, specifically, the water pump fixing base 2114 is fixedly connected with the power supply fixing side plate 218 through a bolt, the peristaltic pump 2115 is installed on the upper surface of the water pump fixing base 2114, and the peristaltic pump 2115 is connected with the power supply 2111.
An electromagnetic valve and a joint fixing ring 2117 are fixedly installed below the water pump fixing base 2114, and the electromagnetic valve and the joint fixing ring 2117 are fixedly connected with the water pump fixing base 2114 through a columnar connecting piece located at the central position; the electromagnetic valve and joint fixing ring 2117 is located below the water pump fixing base 2114 and is fixedly connected with the water pump fixing base 2114, the electromagnetic valve and joint fixing ring 2117 is provided with a connecting seat 2116, the connecting seat 2116 is fixedly provided with a first multi-way joint 2113, a second multi-way joint 2130 and a one-way electromagnetic valve 2118 on the sampling tube and the exhaust tube, wherein the electromagnetic valves 2118 are fixedly connected with one another through an electromagnetic valve module fixing ring 2122, and the one-way electromagnetic valve 2118 is connected with the power supply 2111.
A sampling bottle fixing ring 2119 which is located below the electromagnetic valve and joint fixing ring 2117, wherein the sampling bottle fixing ring 2119 and the electromagnetic valve and joint fixing ring 2117 are also fixedly connected through a columnar connecting piece which is located at the central position, a sampling bottle assembly fixing block 2120 is formed at the bottom end of the columnar connecting piece, a disc-shaped sampling bottle fixing base 2123 is arranged at the central position of the sampling bottle fixing ring 2119, and the sampling bottle fixing base 2123 is fixedly connected with the sampling bottle assembly fixing block 2120 through a bolt; four sampling bottles 2124 are mounted below the sampling bottle fixing base 2123.
A DGT detecting device 22 is further disposed above the integrated sampler 21, as shown in fig. 6 and 7, the DGT detecting device 22 includes a DGT fixing ring 223, and in the present embodiment, 8 placing holes 227 are disposed on the DGT fixing ring 223, the 8 placing holes 227 are disposed in a row and are uniformly arranged along the circumferential direction of the DGT fixing ring 223, and 8 circular DGTs 221 can be mounted. As an alternative embodiment, the DGT placing hole 227 of the DGT detecting device 22 may be made as a double-layer installation, so that the number of round DGT tests can be increased to 16. In this embodiment, the DGT fixing ring 223 has an outer diameter of 23 cm and a height of 6.5 cm. The placement hole 227 is a circular recess with two BPK6 plungers 225 mounted above the interior of the recess for securing the circular DGT221 to the recess, the plungers 225 being automatically releasable upon removal of the DGT.
As shown in fig. 8, the water quality multi-parameter probe detection device 23 includes: the four water quality multi-reference electrodes 232 are respectively used for measuring Eh, pH, temperature and conductance, the four water quality multi-reference electrodes 232 are respectively vertically installed between a base 234 and an electrode fixing base 224 located below the DGT fixing ring 223, the base 234 is fixedly installed above the DGT detecting device 22 through a fixing rod 2310, in the embodiment, the lower end of the fixing rod 2310 penetrates through the DGT fixing ring 223, and the lower end of the fixing rod 2310 is fixed on the electrode fixing base 224 through bolts. The end lead 231 of the water quality multi-reference electrode 232 is connected to the sealing joint 238, and then connected to the cavity below the base 234, and connected to the power supply 2111 and the data storage 215, wherein the data storage 215 is fixedly mounted on the fixing plate 212 of the integrated sampler 21 and is tightly attached to the power supply fixing side plate 218. The probe of the water quality multi-parameter electrode 232 passes through the electrode fixing sleeve 2311 between the two fixing rods 2310, then penetrates through the DGT fixing ring 223 and the electrode fixing base 224 positioned below the DGT fixing ring 223, and finally extends to a position 2cm below the DGT detection device 22; wherein the top end of the electrode fixing sleeve 2311 contacts the base 234 and the bottom end contacts the DGT fixing ring 223. In this embodiment, the detection electrode is fixedly mounted on the base 234 through the electrode fixing cover plate 233, the base 234 is provided with mounting holes, the lower surface of the electrode fixing cover plate 233 is provided with two fixing bolts, the electrode fixing cover plate 233 covers the top end of the electrode, and the fixing bolts can be inserted into the mounting holes on the base 234, so as to fix the top end of the electrode.
The water sampling unit 2 of this embodiment is further provided with a sealing cylinder 2126, the integrated sampler 21 is detachably mounted in the sealing cylinder 2126, a detachable sealing bottom cover 2128 is arranged at the bottom of the sealing cylinder 2126, a mounting ring 2132 is arranged at the top end of the sealing bottom cover 2128, the mounting ring 2132 is adapted to be inserted into the open bottom end of the seal barrel 2126, and is secured to the seal barrel 2126 by screws, a base is arranged at the lower end of the mounting ring 2132, a step is formed at the joint of the base and the mounting ring 2132, when the mounting ring is inserted into the opening at the bottom end of the sealing cylinder 2126, the step contacts the bottom end of the sealing cylinder 2126, and in order to achieve a better sealing effect, a second O-ring 2127 is disposed between the step and the bottom end edge of the sealing barrel 2126. A bottom hanging ring 2129 is disposed on the bottom surface of the sealing bottom cover 2128 for connecting with the lower water sampling unit 2 or the counterweight chassis 5.
In this embodiment, the sealing cylinder 2126 has a diameter of 19.7cm and a height of 48.5 cm. In this embodiment, the sealing cylinder 2126 is a cylindrical cylinder, a cylindrical fixing seat is disposed on the bottom surface of the base 234, the top end of the sealing cylinder 2126 is open, and the open top end of the sealing cylinder 2126 can be sleeved on the cylindrical fixing seat and is fixedly mounted on the fixing seat through a rotating screw 2125; when the sealing cylinder 2126 is mounted on the fixing seat, the top edge of the sealing cylinder 2126 abuts against the bottom surface of the base 234, and a third O-ring 239 is disposed between the top of the sealing cylinder 2126 and the base 234. A top hanging ring 236 is arranged at the top end of the base 234 and is used for connecting with the floating ball 1 or the water sampling unit 2 above.
After the water quality multi-parameter probe detection device 23 and the sealing cylinder 2126 are fixedly mounted, the DGT fixing ring 223 is sleeved on the outer wall of the sealing cylinder 2126 and is located at the upper part of the sealing cylinder 2126.
In this embodiment, the exhaust manifold 213 and the pumping tube 216 of the peristaltic pump 2115 are both disposed to penetrate the DGT detection device 22 and the water quality multi-parameter probe detection device 23 and finally reach the base 234 of the water quality multi-parameter probe detection device 23, and the exhaust port 237 of the exhaust manifold 213 and the water sample inlet 235 of the pumping tube 216 are both disposed on the upper surface of the base.
The DGT testing device for the lake water body is further provided with a sampler auxiliary frame 4, as shown in FIG. 9, a placing ring is arranged at the top end of the sampler auxiliary frame, a plurality of holes 41 are formed in the placing ring, a plurality of guide columns 222 are arranged on the bottom surface of the electrode fixing base 224, and the guide columns 222 are arranged corresponding to the holes in the placing ring and are suitable for being installed in the holes in the placing ring. After the experiment is finished, the sealing cylinder can be detached, and the other parts of the integrated sampler 21, the DGT detection device 22 and the water quality multi-parameter probe detection device 23 which are still in the fixed connection state except the sealing cylinder are placed on the auxiliary sampler frame, so that the device is convenient to detach.
The lake water body experimental method comprises the following steps:
(1) selection of the study area: selecting a research area in Yunnan pond of Yunnan, and selecting 5 sampling points in total; the water depth of the area is 4-10 m.
(2) Preparation of DGT experimental material: the DGT equipment adopted in the experiment is all purchased from Nanjing Weishen environmental protection science and technology Limited. The circular DGT apparatus comprises: ZrO, A520E and CMI-7000 Cation fixed glue for phosphorus and NO in water body respectively3-N and NH4-testing of N; the diffusion glue is 0.50 mm agarose diffusion glue; the filter membrane is a polyethersulfone microporous filter membrane with the aperture of 0.13 mm; a circular DGT housing having a sampling area of 3.14 cm2(ii) a For films with a diameter of 2.5 cm. Assembling the DGT materials to form three types of phosphorus and NO respectively3-N and NH4-circular DGT of N. The materials are classified and put into plastic bags, 2mL of 0.001M NaCl solution is dripped into the plastic bags, and the plastic bags are put into a refrigerator at 4 ℃ for storage. Before field test, the test device is installed on a DGT placing device and immediately put in.
(3) Putting a DGT testing device for the lake water body: the portable ultrasonic bathymeter is adopted to measure the depth of the lake water body, and the water depth of five sampling points is respectively 4.2, 4.8, 5.7, 7.8 and 5.2 m. The surface water depth is 10 cm below the water layer; the middle water is at 2.1, 2.4, 2.85, 3.9 and 2.6 m; the depth of the overlying water of the sediment is as follows: 4.0, 4.6, 5.5, 7.6 and 5.0 m. A mooring rope is adopted to connect the top floating ball 1, the three water sampling units 2 which are vertically distributed and the counterweight chassis 5 in series. Putting the balance weight chassis 5, the three water sample sampling units 2 and the top floating ball 1 into water in sequence; when each water sampling unit 2 is put in, the start switch 217 is pressed to start the sampling related device in the multi-reference electrode and integrated sampler 21.
(4) Taking back the DGT testing device of the lake water body: after 24 hours, taking out three water body DGT testing devices according to the position of the top floating ball 1; when taking out, the starting switch 217 is immediately closed, meanwhile, the round DGT is taken out from the groove of the DGT placing hole 227, is washed clean by deionized water, and then is put into a plastic bag, and a few drops of 0.001M NaCl solution are dropped for storage; simultaneously, taking out the electrode, the sampling bottle and the data memory 215, and disassembling the components of the water body DGT testing device; the round DGT and sample bottles were taken back to the laboratory and either measured immediately or stored in a refrigerator at 4 ℃. The data storage 215 is brought back to the laboratory for data export and analysis with computer software. And meanwhile, repairing the parts of the device. And acquiring physicochemical properties of the five-sample-point three-layer water body, namely Eh, pH, temperature and conductivity data according to the processing effect of computer software.
(5) Subsequent processing and analysis of DGT: and opening the round DGT window, and taking out the filter membrane, the diffusion glue and the fixing glue. Then, ZrO fixed glue (for phosphorus determination) was used in an amount of 1.0 mol L−1Eluting with NaOH for 24 h, and then eluting with 1.0 mol L-1 H2SO4Neutralizing; the neutralized gel washes were then assayed for phosphorus concentration using molybdenum blue spectrophotometry (ascorbic acid reduction) (Murphy and Riley, 1962). A520E (determination of NO)3-N) and CMI-7000 Cation Gum (determination of NH)4N) with 2 mol L-1Eluting with NaCl; then, an ultraviolet spectrophotometry (double wavelength) (HJ-T346-3-N and NH4-N concentration. According to the method, five-sample three-layer deep phosphorus, NO is obtained3-N and NH4DGT concentration of N.
(6) Subsequent treatment and analysis of water samples: nitrogen and phosphorus are carried out to water sample that sampling bottle gatheredMorphological test, determined by molybdenum blue spectrophotometry (ascorbic acid reduction) (Murphy and Riley, 1962): TP (total phosphorus), DTP (soluble total phosphorus) and SRP (soluble reactive phosphorus); the measurement is carried out by adopting an ultraviolet spectrophotometry (double wavelength) (HJ-T346-: NO3N (nitrate nitrogen), NH4N (ammonium nitrogen) and TN (total nitrogen). The concentrations of TP, DTP, SRP, NO 3-N, NH4-N and TN in the five-spot water samples were determined according to the above method.
(7) Follow-up study: according to the DGT concentration of nitrogen and phosphorus in the three-layer water depth of the five sampling points, various nitrogen and phosphorus morphological concentrations and physical and chemical properties of the water body tested by a conventional analysis method, the nitrogen and phosphorus eutrophication degree and the eutrophication formation mechanism of the water body section of the five sampling points are researched by combining the hydrology and watershed geographical background of the Yunnan pond.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the claims.
Claims (9)
1. A DGT testing device for a lake water body is characterized by comprising:
a floating ball;
the water sampling units are sequentially arranged below the floating ball in the vertical direction, and each two adjacent water sampling units and the uppermost water sampling unit and the floating ball are connected through ropes;
each water sample sampling unit is provided with a DGT detection device, a water quality multi-parameter probe detection device and a water sample collection device;
wherein the water sample collection system includes:
the sampling device comprises a plurality of sampling bottles, a sampling tube and an exhaust tube, wherein each sampling bottle is provided with the sampling tube and the exhaust tube; a one-way electromagnetic valve is arranged on each sample inlet pipe and each exhaust pipe;
a water sample outlet of the peristaltic pump is respectively communicated with the sampling pipes of the plurality of sampling bottles through a first multi-way joint; meanwhile, the exhaust pipes of the plurality of sampling bottles are connected to an exhaust main pipe through a second multi-way joint;
and the control device is connected with the peristaltic pump and the one-way electromagnetic valves on the sampling pipes and the exhaust pipes.
2. The DGT testing device for the lake water body as claimed in claim 1, wherein the water sample collecting device is provided with an integrated sampler, and the integrated sampler comprises:
the fixing plate is fixedly provided with a power supply and a control device on the bottom surface;
the water pump fixing base is positioned below the fixing base and fixedly connected with the fixing plate, and the peristaltic pump is mounted on the water pump fixing base;
the electromagnetic valve and the connector fixing ring are positioned below the water pump fixing base and are fixedly connected with the water pump fixing base, the electromagnetic valve and the connector fixing ring are provided with a connecting seat, and the first multi-way connector, the second multi-way connector and the one-way electromagnetic valve are fixedly arranged on the connecting seat;
the sampling bottle fixing ring is positioned below the electromagnetic valve fixing ring and is fixedly connected with the electromagnetic valve fixing ring, and a sampling bottle is arranged below the sampling bottle fixing ring;
the power supply is respectively connected with the peristaltic pump, the one-way solenoid valve and the control device through leads.
3. The DGT testing device for the lake water body as claimed in claim 2, wherein the DGT detecting device is provided with a DGT fixing ring, a plurality of placing holes are uniformly arranged along the circumferential direction of the DGT fixing ring, and a plurality of DGT probes are respectively installed in the plurality of placing holes.
4. The DGT testing device for the lake water body as claimed in claim 3, wherein the water quality multi-parameter probe detection device comprises a base, a mounting hole is formed in the base, a detection electrode is mounted in the mounting hole, and the detection electrode is fixedly mounted on the mounting hole of the base through an electrode fixing cover plate; a fixed rod is fixedly arranged below the base, and the base of the water quality multi-parameter probe detection device is fixedly arranged above the DGT detection device through the fixed rod; the bottom end probe of the detection electrode penetrates through the DGT fixing ring of the DGT testing device and extends to the lower part of the DGT fixing ring.
5. The DGT testing device for the lake water body as claimed in claim 4, wherein the integrated sampler is further provided with a data memory, and the data memory is fixedly mounted on the fixing plate and connected with the detection electrode.
6. The DGT testing device for the lake water body as claimed in claim 5, wherein the number of the sampling bottles is four, and the first multi-way joint and the second multi-way joint are both five-way joints; the water sampling unit is provided with three.
7. The DGT testing device for the lake water body as claimed in claim 6, wherein a sealing cylinder is further provided, the integrated sampler is detachably mounted in the sealing cylinder, and the DGT fixing ring of the DGT detecting device is sleeved on the outer wall of the sealing cylinder and is located at the upper part of the sealing cylinder.
8. The DGT testing device for the lake water body as claimed in claim 7, wherein the exhaust manifold and the pumping pipe of the peristaltic pump are arranged to penetrate through the DGT testing device and the multi-parameter water quality probe testing device and finally reach the base of the multi-parameter water quality probe testing device, and the exhaust port of the exhaust manifold and the water sample inlet of the pumping pipe are arranged on the upper surface of the base.
9. The DGT testing device for the lake water body as claimed in claim 8, wherein a sampler auxiliary frame is further provided, and the water sampling unit is detachably mounted on the sampler auxiliary frame.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020024877.5U CN212646397U (en) | 2020-01-07 | 2020-01-07 | DGT testing device for lake water body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020024877.5U CN212646397U (en) | 2020-01-07 | 2020-01-07 | DGT testing device for lake water body |
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| CN212646397U true CN212646397U (en) | 2021-03-02 |
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