CN113917096B - Water quality detection system and method - Google Patents
Water quality detection system and method Download PDFInfo
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- CN113917096B CN113917096B CN202111051400.1A CN202111051400A CN113917096B CN 113917096 B CN113917096 B CN 113917096B CN 202111051400 A CN202111051400 A CN 202111051400A CN 113917096 B CN113917096 B CN 113917096B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 17
- 238000005119 centrifugation Methods 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000012372 quality testing Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 description 11
- 238000005070 sampling Methods 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention provides a water quality detection system and a method, wherein the water quality detection system comprises a constant volume cup and an analysis unit; further comprises: the turbidity detection module is used for detecting the turbidity of the water sample in the constant volume cup; the mechanical arm moves up and down and is used for extending the sample inlet pipe, the sample supply pipe and the cleaning pipe into and out of the centrifugal cup; the sample injection pipe is communicated with the constant volume cup, and the sample supply pipe is communicated with the analysis unit; the centrifugal cup is movably arranged on the rotating arm; the driving module is used for driving the rotating arm to rotate, so that the included angle between the central axis of the centrifugal cup and the rotating shaft of the rotating arm is changed. The invention has the advantages of high analysis precision and the like.
Description
Technical Field
The invention relates to water sample analysis, in particular to a water quality detection system and a water quality detection method.
Background
At present, many domestic automatic water quality monitoring stations are all in the construction of a gong-and-seal drum, and the turbidity of water bodies in the areas is greatly increased under various emergency conditions such as heavy rain, mountain floods, fleet running and the like caused by partial tidal sections, river-entering ports or partial canal. The turbidity can have a larger influence on the total phosphorus automatic analysis equipment, so that the monitoring result is deviated (mainly shown in the influence of light absorbers generated by particles in the water body on the monitoring result for an analysis instrument of an ammonium molybdate spectrophotometry). In order to implement the ecological environment monitoring network construction scheme and the national ecological environment quality monitoring law, the national monitoring network monitoring work is developed in a standardized way, and the national environmental monitoring total station issues the technical regulation (trial) of the on-site pretreatment of the total phosphorus of the surface water. The work instruction book explicitly specifies: the regulation is suitable for on-site monitoring of total phosphorus in manual monitoring of the environmental quality of surface water (rivers, lakes and reservoirs and the like), and the automatic monitoring of the water quality can be performed with reference to the execution. When the turbidity of the raw water of the general water body is more than 500NTU, 2000r/min, centrifuging for 2min, and taking supernatant; the turbidity of the raw water in the tidal river reach is more than 200NTU,2000r/min, and the supernatant is obtained after centrifugation for 1 min.
Aiming at the existing water quality detection products, a turbidity detection module and a scheme for adjusting the centrifugal speed and time of a water sample by utilizing turbidity are not found.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a water quality detection system.
The invention aims at realizing the following technical scheme:
the water quality detection system comprises a constant volume cup and an analysis unit; the water quality detection system further comprises:
the turbidity detection module is used for detecting the turbidity of the water sample in the constant volume cup;
the mechanical arm moves up and down and is used for extending the sample inlet pipe, the sample supply pipe and the cleaning pipe into and out of the centrifugal cup; the sample injection pipe is communicated with the constant volume cup, and the sample supply pipe is communicated with the analysis unit;
the centrifugal cup is movably arranged on the rotating arm;
the driving module is used for driving the rotating arm to rotate, so that the included angle between the central axis of the centrifugal cup and the rotating shaft of the rotating arm changes.
The invention also provides a water quality detection method, and the aim of the invention is achieved by the following technical scheme:
the water quality detection method comprises the following steps:
(A1) The water sample enters a constant volume cup to obtain the turbidity of the water sample;
(A2) Transferring the water sample in the constant volume cup into a centrifugal cup;
(A3) Obtaining the viscosity of the water sample corresponding to the turbidity of the water sample, and obtaining the centrifugation time of a centrifugation cup by utilizing the parameters of particulate matters in the water sample and the parameters of the water sample;
(A4) And driving the centrifugal cup to rotate according to the centrifugal time.
Compared with the prior art, the invention has the following beneficial effects:
1. the analysis is accurate;
the turbidity detection module is configured, the centrifugal time is obtained by utilizing the turbidity, and the optimal centrifugal effect is achieved by precisely controlling the centrifugal time, so that the accuracy of subsequent analysis is improved;
the independent water sampling, sample feeding and pipeline cleaning are adopted, so that mutual interference can be avoided, and the analysis accuracy of the water sample is high;
the arranged cleaning pipeline realizes on-line cleaning of the centrifugal cup, and effectively solves the problem of pollutant precipitation at the bottom of the centrifugal cup;
2. the structure is simple and the operation is easy;
the one-dimensional mechanical arm is adopted for water collection, sample supply and cleaning of the centrifugal machine, so that the precision of water collection and sample supply is ensured, meanwhile, the centrifugal machine can be used for directly sampling without opening a cover plate of the centrifugal machine, the tightness is higher, dust and splash prevention are effectively realized, and the humidity in the device is effectively reduced;
3. the compatibility is good;
the water station system adopts modularized structural design and flexible and variable interface collocation, is expandable, maintainable and remodelable, and is compatible with the existing water station system.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are only for illustrating the technical scheme of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a schematic diagram of a water quality testing system according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of explaining the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or alternatives derived from these embodiments that fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the invention is not limited to the following alternative embodiments, but only by the claims and their equivalents.
Example 1:
FIG. 1 shows a schematic structural diagram of a water quality detection system according to an embodiment of the present invention, as shown in FIG. 1, the water quality detection system includes:
a constant volume cup and an analysis unit, both of which are prior art in the art;
the turbidity detection module is used for detecting the turbidity of the water sample in the constant volume cup;
a mechanical arm which moves up and down for extending the sample inlet tube 21, the sample supply tube 22 and the cleaning tube 23 into and out of the centrifugal cup 32; the sampling tube 21 is communicated with the constant volume cup, and the sampling tube 22 is communicated with the analysis unit;
a rotating arm 31 and a centrifugal cup 32, the centrifugal cup 32 being movably provided on the rotating arm 31;
the driving module is used for driving the rotating arm 31 to rotate, so that the included angle between the central axis of the centrifugal cup 32 and the rotating shaft of the rotating arm 31 is changed.
Further, the centrifugal cups 32 are uniformly distributed on the circumference in order to improve the centrifugal efficiency.
In order to obtain the centrifugation time and the rotation speed, further, the water quality detection system further comprises:
the calculating unit is used for obtaining the centrifugation time t according to the parameters of the water sample;
f is centrifugal force; a is the radius of the particles in the water sample, ω is the angular velocity of the rotating arm, η is the viscosity of the water sample, ρ is the density of the particles in the water sample, ρ 0 Is the density of the water sample, d 0 The distance from the particulate matters at the centrifugal cup opening to the rotating shaft is the same;
and the control unit is used for adjusting the working time of the driving module according to the centrifugal time t.
In order to reduce structural complexity and maintainability, further, the mechanical arm includes:
a guide rail 12 and a bracket 11, wherein the guide rail 12 is vertically arranged and fixed on the bracket 11;
a slider 13, wherein the slider 13 is arranged on the guide rail 12 and vertically translates along the guide rail 12 under the drive of the driving unit 14, and the sample inlet tube 21, the sample supply tube 22 and the cleaning tube 23 are fixed on the slider 13;
the protection tube 24 is vertically arranged and fixed on the sliding block 13, and the sample injection tube 21, the sample supply tube 22 and the cleaning tube 23 are arranged in the protection tube 24; the opening of the centrifugal cup 32 allows the protective tube 24 to pass through.
In order to prevent the protective tube from deviating from the vertical direction in the up-and-down translation, further, the portion of the bracket 11 located on the lower side of the slider 13 has a guide hole allowing the protective tube 24 to pass through.
In order to reduce the structural complexity and maintainability, further, the driving unit 14 adopts a motor and drives the guide rail 12 to rotate, the guide rail adopts a screw rod, and the sliding block 13 and the guide rail 12 are matched through threads.
The water quality detection method of the embodiment of the invention comprises the following steps:
(A1) The water sample enters a constant volume cup to obtain the turbidity of the water sample;
(A2) Transferring the water sample in the constant volume cup into a centrifugal cup;
(A3) Obtaining the viscosity of the water sample corresponding to the turbidity of the water sample, and obtaining the centrifugation time of a centrifugation cup by utilizing the parameters of particulate matters in the water sample and the parameters of the water sample;
(A4) And driving the centrifugal cup to rotate according to the centrifugal time.
In order to improve the turbidity measurement accuracy, in the step (A3), further, the turbidity of the water sample is obtained by the following steps:
and sequentially feeding a plurality of water samples into the constant volume cup to respectively obtain turbidity, wherein the maximum value in the plurality of turbidity is used as the turbidity of the water samples.
In order to obtain the centrifugation time, further, the centrifugation time t is obtained in the following manner:
f is centrifugal force; a is the radius of the particles in the water sample, ω is the angular velocity of the centrifuge cup, i.e. the angular velocity of the rotating arm, η is the viscosity of the water sample, said viscosity being obtained by means of said turbidity, ρ is the density of the particles in the water sample, ρ 0 Is the density of the water sample, d 0 Is the distance from the particulate matters at the opening of the centrifugal cup to the rotating shaft of the centrifugal cup.
In order to improve the detection accuracy, further, a plurality of water samples are respectively transferred into each centrifugal cup in a mode of steps (A1) - (A2), and in step (A4), the plurality of centrifugal cups rotate simultaneously.
Example 2:
application example of the water quality detection system and method according to embodiment 1 of the present invention.
In this application example, as shown in fig. 1, the mechanical arm includes a vertically arranged bracket 11 and a guide rail 12, where the guide rail adopts a screw rod, and two ends of the guide rail are fixed on the bracket 11 and rotate in situ; the motor is fixed on the bracket 11 and drives the screw rod to rotate; the sliding block 13 is arranged on the guide rail 12 through threads, and the side part of the sliding block is contacted with the bracket 11, so that when the screw rod rotates, the sliding block 13 is driven to translate up and down on the guide rail 12, and the side part of the sliding block 13 translates up and down along the bracket 11; the bottom of the bracket 11 is provided with a guide hole;
the sample inlet tube 21, the sample supply tube 22 and the cleaning tube 23 are fixed on the slide block 13; the protection tube 24 is vertically arranged and fixed on the sliding block 13, and the sample injection tube 21, the sample supply tube 22 and the cleaning tube 23 are arranged in the protection tube 24; in the vertical translation of the protection tube 24 following the slider 13, the protection tube 24 always moves in the guide hole, ensuring the vertical movement of the protection tube 24;
4 centrifugal cups 32 are movably arranged on the rotating arm 31, and openings of the centrifugal cups 32 allow the protective tube 24 to pass through; the motor is used for driving the rotating arm 31 to rotate, so that the included angle between the central axis of the centrifugal cup 32 and the rotating shaft of the rotating arm 31 is changed, and the four centrifugal cups 32 are sequentially positioned on the lower side of the protection tube 24 under the driving of the driving module;
the calculating unit is used for obtaining the centrifugation time t according to the parameters of the water sample;
the magnitude of the centrifugal force F is shown on existing centrifugal rotary platforms, which is known in the art; a is the radius of the particles in the water sample, ω is the angular velocity of the rotating arm, also the angular velocity of the centrifugal cup, η is the viscosity of the water sample, ρ is the density of the particles in the water sample, ρ 0 Is the density of the water sample, d 0 The distance from the particulate matters at the centrifugal cup opening to the rotating shaft is the same; in the calculation, the unit of each parameter is required to be converted into an international unit, such as the angular velocity is required to be converted into radian/second, a, d 0 Units of (2) are meters, ρ and ρ 0 Unit kg/m 3 ；
And the control unit is used for adjusting the working time of the driving module according to the centrifugal time t.
The water quality detection method of the embodiment of the invention, namely the working method of the water quality detection system according to the embodiment of the invention, comprises the following steps:
(A1) Under the action of a pump, a water sample enters a constant volume cup, and turbidity of the water sample is obtained by utilizing a turbidity detection module;
(A2) The motor drives the rotating arm 31 to rotate, so that the centrifugal cup 32 is positioned at the lower side of the protection tube 24;
the motor on the bracket 11 rotates to drive the screw rod to rotate, the sliding block 13 vertically translates downwards to drive the protection pipe 24 to vertically move downwards, the protection pipe passes through the upper end opening of the centrifugal cup 32 and enters the centrifugal cup 32, and the water sample in the constant volume cup is transferred into the centrifugal cup 32 through the sample inlet pipe;
respectively feeding the water sample into a constant volume cup according to the modes of the steps (A1) - (A2) to obtain turbidity of the water sample, transferring the turbidity into each centrifugal cup, and then moving up a protection tube to obtain maximum values of four turbidity values as turbidity of the water sample;
(A3) Obtaining a viscosity of the water sample corresponding to turbidity (maximum value in four turbidity values) of the water sample, as shown in the following table;
particle radius a according to raw water actual conditions: 10-100 μm, particle density ρ:1.9g/cm 3 ～2.7g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Taking a=10μm, ρ=1.9 g/cm 3 、ω＝4000π/min、ρ 0 ＝1g/cm 3 ，d 0 ＝120mm；
a: at normal temperature, when the turbidity beta of raw water is less than or equal to 200NTU, the viscosity of raw water is eta=1 multiplied by 10 < -3 > PaS, t=57 s is obtained by utilizing an analysis unit, the time for settling particles at the centrifugal cup mouth to the bottom of a cup is s in ideal case when omega=4000 pi/min, and meanwhile, the rotating arm is accelerated from rest to omega=4000 pi/min, and the time is required to be 12s, so that the centrifugal pretreatment time is 69s;
b: at normal temperature, when the raw water is turbidWhen the degree beta is within the range of 200 NTU-beta-500 NTU-beta, the raw water viscosity is eta=2×10 -3 And PaS, when t=74 s is obtained by using the analysis unit, in an ideal case, when ω=4000 pi/min, the time for the particles at the centrifugal cup mouth to settle to the bottom of the cup is s, and meanwhile, the rotation arm is accelerated from rest to ω=4000 pi/min, and the time is 12s, so that the centrifugal pretreatment time is 76s.
c: at normal temperature, when the turbidity beta of raw water is within the range that beta is not less than 500NTU and not more than 1000NTU, the viscosity of raw water is eta=5 multiplied by 10 < -3 > PaS, and t=149 s is obtained by utilizing an analysis unit, so that in the ideal case, when omega=4000 pi/min, the sedimentation time of particles at the centrifugal cup mouth to the bottom of the cup is s, and meanwhile, the rotation arm is accelerated from rest to omega=4000 pi/min, and the time is required to be 12s, so that the centrifugal pretreatment time is 161s.
d: at normal temperature, when the turbidity beta of raw water is within the range of 1000NTU less than or equal to beta less than or equal to 2000NTU, the viscosity of raw water is eta=10x10 < -3 > PaS, t=215 s is obtained by utilizing an analysis unit, the time for settling particles at the centrifugal cup mouth to the bottom of the cup is s in ideal case when omega=4000 pi/min, and meanwhile, the rotating arm is accelerated from rest to omega=4000 pi/min, and the time is required to take 12s, so that the centrifugal pretreatment time is 227s.
(A4) Driving the centrifugal cup to rotate according to the centrifugal time;
after centrifugation, the protective tube 24 moves down and enters the centrifugal cup 32, and the supernatant in the centrifugal cup 32 is sent to an analysis unit by using the sample supply tube 22;
after the detection is finished, extracting all water samples in the centrifugal cup by using a sampling tube; the cleaning water enters the constant volume cup, then enters the centrifugal cup through the cleaning pipe for flushing, and then is discharged; the cleaning of the 4 centrifugal cups was completed in this manner.
Claims (8)
1. The water quality detection system comprises a constant volume cup and an analysis unit; the water quality detection system is characterized by further comprising:
the turbidity detection module is used for detecting the turbidity of the water sample in the constant volume cup;
the mechanical arm moves up and down and is used for extending the sample inlet pipe, the sample supply pipe and the cleaning pipe into and out of the centrifugal cup; the sample injection pipe is communicated with the constant volume cup, and the sample supply pipe is communicated with the analysis unit;
the centrifugal cup is movably arranged on the rotating arm;
the driving module is used for driving the rotating arm to rotate, so that the included angle between the central axis of the centrifugal cup and the rotating shaft of the rotating arm is changed;
the calculating unit is used for obtaining the centrifugation time t according to the parameters of the water sample;
，/>，
，/>，/>the method comprises the steps of carrying out a first treatment on the surface of the F is centrifugal force; a is the radius of the particles in the water sample, ω is the angular velocity of the rotating arm, η is the viscosity of the water sample, ρ is the density of the particles in the water sample, ρ 0 Is the density of the water sample, d 0 The distance from the particulate matters at the centrifugal cup opening to the rotating shaft is the same;
and the control unit is used for adjusting the working time of the driving module according to the centrifugal time t.
2. The water quality testing system of claim 1, wherein the plurality of centrifugal cups are evenly distributed around the circumference.
3. The water quality testing system of claim 1, wherein the robotic arm comprises:
the guide rail is vertically arranged and fixed on the bracket;
the sliding block is arranged on the guide rail and vertically translates along the guide rail under the drive of the driving unit, and the sample inlet pipe, the sample supply pipe and the cleaning pipe are fixed on the sliding block;
the protection pipe is vertically arranged and fixed on the sliding block, and the sample inlet pipe, the sample supply pipe and the cleaning pipe are arranged in the protection pipe; the opening of the centrifugal cup allows the protective tube to pass through.
4. A water quality testing system according to claim 3, wherein the portion of the bracket that is on the underside of the slider has a pilot hole that allows the protective tube to pass through.
5. A water quality testing system according to claim 3, wherein said drive unit employs a motor and drives said guide rail to rotate, said guide rail employs a screw, and said slider and guide rail are threadably engaged.
6. A water quality detection method of a water quality detection system according to any one of claims 1 to 5, the water quality detection method comprising the steps of:
(A1) The water sample enters a constant volume cup to obtain the turbidity of the water sample;
(A2) Transferring the water sample in the constant volume cup into a centrifugal cup;
(A3) Obtaining the viscosity of the water sample corresponding to the turbidity of the water sample, and obtaining the centrifugation time of a centrifugation cup by utilizing the parameters of particulate matters in the water sample and the parameters of the water sample; the centrifugation time t is obtained by:
，/>，
，/>，/>the method comprises the steps of carrying out a first treatment on the surface of the F is centrifugal force; a is the radius of the particles in the water sample, ω is the angular velocity of the rotating arm, η is the viscosity of the water sample, ρ is the density of the particles in the water sample, ρ 0 Is the density of the water sample, d 0 The distance from the particulate matters at the opening of the centrifugal cup to the rotating shaft is the distance;
(A4) And driving the centrifugal cup to rotate according to the centrifugal time.
7. The method for detecting water quality according to claim 6, wherein in the step (A3), the turbidity of the water sample is obtained by:
and sequentially feeding a plurality of water samples into the constant volume cup to respectively obtain turbidity, wherein the maximum value in the plurality of turbidity is used as the turbidity of the water samples.
8. The method of detecting water quality according to claim 6, wherein a plurality of water samples are transferred to the respective centrifugal cups by means of steps (A1) to (A2), respectively, and the plurality of centrifugal cups are rotated simultaneously in step (A4).
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| CN116183846A (en) * | 2022-12-14 | 2023-05-30 | 武汉新烽光电股份有限公司 | Portable microfluidic water quality detector |
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| CN212189603U (en) * | 2020-05-08 | 2020-12-22 | 李海足 | Environmental water quality detection auxiliary assembly is used in hydraulic and hydroelectric engineering construction |
| CN111781053A (en) * | 2020-06-16 | 2020-10-16 | 力合科技（湖南）股份有限公司 | Water sample pretreatment device, water sample pretreatment system and water sample pretreatment method |
| CN213792223U (en) * | 2020-12-03 | 2021-07-27 | 石家庄创凡检测技术服务有限公司 | Waste water detects uses centrifuge |
| CN113267397A (en) * | 2021-04-23 | 2021-08-17 | 山东水利职业学院 | A centrifugal equipment for water quality testing |
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