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Microfluidic-based rapid automatic water quality detection system and method

A technology of water quality testing and testing methods, applied in chemical instruments and methods, measuring devices, laboratory containers, etc., can solve the problem that the shelf life cannot meet unmanned, maintenance-free, does not include digestion and step-by-step processes, and is difficult to handle and storage and transportation problems, to eliminate difficult transportation and handling, shorten reaction time or analysis time, reduce water sample demand and reagent consumption

Pending Publication Date: 2021-07-23
WUHAN NEWFIBER OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the microfluidic technology of the main indicators of water quality monitoring (total phosphorus, total nitrogen, ammonia nitrogen and COD) on the market is almost all reusable chips, and the fluid is controlled in the form of pump valves, such as CN108072648A, CN208537406, etc. There are many Disadvantages: Waste liquid still exists in the form of liquid, which is not easy to handle, store and transport; because of the narrow microchannel in the chip, the chip will inevitably be blocked during repeated use; on-site liquid reagents are limited to a one-month shelf life and cannot meet the long-term online requirements Unmanned monitoring and maintenance-free requirements
Although CN110161026 introduces a centrifugal microfluidic chip for detecting residual chlorine in water by DPD spectrophotometry, it does not include total phosphorus, total nitrogen, ammonia nitrogen and COD, etc., which are more urgent, wider and more complex in water quality indicators. Design does not include more complex digestion and step-by-step procedures

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  • Microfluidic-based rapid automatic water quality detection system and method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A rapid automatic water quality detection system based on microfluidics, including a microfluidic chip 1, the microfluidic chip 1 includes a chip body 2, and the chip body is provided with a sample loading area 3, a digestion detection area 4, and a plurality of reagent areas 5. The chip body 2 is provided with a rotation axis 6. The sample loading area 3 and the reagent area 5 are closer to the rotation axis 6 than the digestion detection area 4. The sample loading area 3 and each reagent area 5 pass through the sampling channel 7 and the digestion detection area. Area 4 is in communication, and a one-way valve 8 is provided at the area where the digestion detection area 4 communicates with the sampling channel 7 .

[0055] The reagent in the reagent area 5 is covered by the reagent coating. The centrifugal force rupture strength of the reagent coating in each reagent zone 5 is different or the centrifugal force rupture strength of the reagent coating in some reagent z...

Embodiment 2

[0079] A microfluidic-based rapid automated total phosphorus detection method, utilizing the microfluidic-based rapid automated water quality detection system in Example 1, comprising the following steps:

[0080] Use a pipette gun to quantitatively pipette 200 μL of the water sample to be tested and inject it from the sample port into the sample area 3. The potassium persulfate digestion solution is preset in the digestion detection area 4, and the reducing agent ascorbic acid is preset in the first reagent area 5. The chromogen (ammonium molybdate reagent) is preset in the second reagent area 5; the centrifugal base drives the microfluidic chip 1 to rotate centrifugally, first the microfluidic chip 1 will reciprocate at the initial speed R0, so that The water sample is fully mixed with the potassium persulfate digestion solution in the digestion detection area 4 through the sampling channel 7, and then the digestion detection area 4 is rapidly heated to 120°C through the elec...

Embodiment 3

[0085] A kind of rapid automatic total nitrogen detection method based on microfluidics, utilizes the rapid automatic water quality detection system based on microfluidics in embodiment 1, comprises the following steps:

[0086] Use a pipette gun to quantitatively pipette 200 μL of the water sample to be tested from the sample port into the sample area 3, the digestion solution (alkaline potassium persulfate) is preset in the digestion detection area 4, and hydrochloric acid is preset in the first reagent area 5 Reagents, the second reagent area 5 is not filled with any reagents; the centrifugal base drives the microfluidic chip 1 to rotate centrifugally, first the microfluidic chip 1 will reciprocate at the initial speed R0, so that the water sample in the sample loading area 3 passes through The digestion solution in the sampling channel 7 and the digestion detection area 4 are fully mixed, and then the temperature of the digestion detection area 4 is rapidly raised to 125°C ...

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Abstract

The invention discloses a microfluidic-based rapid automatic water quality detection system, which comprises a microfluidic chip, the microfluidic chip comprises a chip body, the chip body is provided with a sample adding area, a digestion detection area and a plurality of reagent areas, the chip body is provided with a rotating shaft, the sample adding area and the reagent areas are closer to the rotating shaft relative to the digestion detection area, the sample adding area and each reagent area are communicated with the digestion detection area through a sample introduction channel, and a one-way valve is arranged at the communication part of the digestion detection area and the sample introduction channel. The invention further discloses a microfluidic-based rapid automatic water quality detection method. According to the invention, the reagent is preset on the micro-fluidic chip, the micro-fluidic chip can be compatible with main water quality indexes such as total phosphorus, total nitrogen, ammonia nitrogen, COD (Chemical Oxygen Demand) and the like, and creatively integrates the problems such as high-temperature closed digestion, step-by-step reaction, reagent presetting and the like on a small micro-fluidic chip.

Description

technical field [0001] The invention belongs to the field of water quality detection, and more relates to a rapid automatic water quality detection system based on microfluidic control, and also relates to a rapid automatic water quality detection method based on microfluidic control, which is suitable for water quality such as total phosphorus, total nitrogen, ammonia nitrogen and COD Microfluidic measurement of indicators. Background technique [0002] At present, the microfluidic technology of the main indicators of water quality monitoring (total phosphorus, total nitrogen, ammonia nitrogen and COD) on the market is almost all reusable chips, and the fluid is controlled in the form of pump valves, such as CN108072648A, CN208537406, etc. There are many Disadvantages: Waste liquid still exists in liquid form, which is not easy to handle, store and transport; because of the narrow microchannel in the chip, the chip will inevitably be blocked during repeated use; on-site liq...

Claims

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Application Information

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IPC IPC(8): G01N1/44G01N21/31G01N21/78G01N21/01B01L3/00
CPCG01N1/44G01N21/31G01N21/78G01N21/01B01L3/5027B01L2200/10
Inventor 武治国杨伟光潘凌徐锦锋张振扬阮利民周海涛周勇周久
Owner WUHAN NEWFIBER OPTOELECTRONICS TECH