Method for quickly detecting heavy metal in water quality based on ultra-infiltration microchip

A microchip and super-wetting technology, applied in the field of material preparation and chemical detection and analysis, can solve complex, time-consuming, laborious, cumbersome sampling, titration, oscillation operations and other problems, and achieve the effect of solving high cost and cumbersome operation

Active Publication Date: 2018-06-08
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the detection techniques commonly used in the detection of heavy metal ions in water, such as instrumental analysis (atomic absorption spectrometry, ultraviolet-visible spectrophotometry, voltammetry) require complex equipment and operating methods, which are not easy to carry and require professional level of operators Higher requirements are put forward; chemical analysis methods (chemical titration, colorimetry) have simple equipment, but still require cumbersome sampling, titration, and shaking operations, which are time-consuming and laborious

Method used

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  • Method for quickly detecting heavy metal in water quality based on ultra-infiltration microchip
  • Method for quickly detecting heavy metal in water quality based on ultra-infiltration microchip
  • Method for quickly detecting heavy metal in water quality based on ultra-infiltration microchip

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Experimental program
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Effect test

Embodiment 1

[0038] Step 1. In 0.98g of absolute ethanol solution, add 0.015g of polydimethylsiloxane-modified hydrophobic silica particles and 0.02g of 1H,1H,2H,2H-perfluorooctyltriethoxy silane. Stir magnetically or vortex for 30 minutes at room temperature, and then sonicate for 30 minutes to obtain a superhydrophobic silica suspension.

[0039] Step 2: Cut a small piece of double-sided tape, absorb the above suspension and drop it on the side of the release paper of the tape, and spread it evenly with a 100μm wire rod applicator. Place it at room temperature for 5 minutes until the ethanol is completely volatilized, and a layer of super-hydrophobic coating (such as figure 1 ). Take the photomask plate, clamp it on the double-sided adhesive tape coated with superhydrophobic silicon dioxide coating with a long tail clip, and place it in a plasma cleaning machine for etching for 8 minutes. The area passing through the holes on the photomask forms super-hydrophilic micropores, and the c...

Embodiment 2

[0045] The heavy metals nickel, chromium, and copper were detected with kits purchased from the market. In a clean test tube, add 4 μL of nickel detection reagent 1 (the main component is ammonia water-ammonium chloride buffer), then add 2 μL of nickel detection reagent 2 (the main component is dimethylglyoxime), shake well to obtain the nickel detection solution. Measure 2 μL of the detection solution and add it dropwise to the super-hydrophilic micropore of the microchip, and let it dry naturally at room temperature, and the detection substance in the detection solution is enriched on the micropore (such as Figure 7 ). Dip the 70mg / L nickel ion standard solution (such as Figure 8 ). Superhydrophilic detection sites on microchips (such as Figure 9a ), after dipping the capture (eg Figure 9b ) droplets gradually develop color to a stable wine red (such as Figure 9c ), proved the feasibility of the present invention.

[0046]Based on the proof-of-concept, take 5 μL o...

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Abstract

The invention discloses a method for quickly detecting heavy metal in water quality based on an ultra-infiltration microchip and belongs to the fields of material preparation and chemical examinationand analysis. The method comprises the following steps: firstly, reacting hydrophobic silica particles with fluorosilane in an ethanol solution to obtain superhydrophobic silica suspension; secondly,coating one side of a double-sided adhesive tape with the suspension to obtain superhydrophobic surface; finally, carrying out plasma etching in a designated area to obtain superhydrophilic microporesand an ultra-infiltration chip; pasting the ultra-infiltration chip on a specific substrate instrument by using the stickiness of the adhesive tape. By use of the ultra-infiltration chip, a color-producing reagent can be concentrated and enriched on the superhydrophilic micropores; the prepared ultra-infiltration chip can fix a detected solution on superhydrophilic sites by simple dipping operation, and colorimetric detection is realized by using a detection reagent on the hydrophilic sites. According to the method, the problems of high cost of a traditional apparatus analysis method and troublesome operation of a chemical analysis method are solved; the method is suitable for quick field detection of an aqueous solution.

Description

technical field [0001] The invention relates to the fields of material preparation and chemical detection and analysis, in particular to a method for rapidly detecting heavy metals in water quality based on super-wetting microchips. Background technique [0002] Water pollution is one of the most serious environmental problems facing the world today. With the development of industry and the improvement of human living standards, more and more pollutants are thrown into natural water bodies, threatening the normal operation of the ecosystem. Among them, heavy metals in water such as hexavalent chromium can invade the human body through digestion, respiratory tract, skin and mucous membranes, endangering human health. [0003] Quickness and simplicity have always been one of the goals pursued by detection technology. At present, the detection techniques commonly used in the detection of heavy metal ions in water, such as instrumental analysis (atomic absorption spectrometry,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/78G01N33/18
CPCG01N21/01G01N21/78G01N33/1813
Inventor 许太林何学成许利苹张学记王树涛
Owner UNIV OF SCI & TECH BEIJING
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