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Paper-based micro-fluidic chip for detecting chromium and mercury ions in water body as well as preparation method and detection method of paper-based micro-fluidic chip

A technology of microfluidic chips and mercury ions, which is applied in chemical instruments and methods, laboratory containers, material analysis through observation of the influence of chemical indicators, etc., can solve problems such as accurate quantification of complex color development methods, Achieve the effect of lowering the threshold of technical operation, facilitating large-scale production and low production cost

Pending Publication Date: 2020-03-24
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the colorimetric method adopted by the above-mentioned paper-based microfluidic chips often uses complex color development methods and there are few accurate quantitative methods.

Method used

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  • Paper-based micro-fluidic chip for detecting chromium and mercury ions in water body as well as preparation method and detection method of paper-based micro-fluidic chip
  • Paper-based micro-fluidic chip for detecting chromium and mercury ions in water body as well as preparation method and detection method of paper-based micro-fluidic chip
  • Paper-based micro-fluidic chip for detecting chromium and mercury ions in water body as well as preparation method and detection method of paper-based micro-fluidic chip

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Its preparation method comprises the following steps:

[0036] (1) Make a blank chip: use drawing software to design such as figure 1 The chip flow path of the paper-based microfluidic chip shown is sprayed with wax on one side of the filter paper to form the hydrophobic area and the functional areas of the paper-based microfluidic chip; then put the filter paper of the printed flow path at 150°C Heat it in a vacuum oven until the wax melts and penetrates the paper. Finally, the filter paper was taken out, and after cooling at room temperature for 1 min, the other side of the filter paper was evenly covered with scotch tape. Obtain a blank chip, and store the prepared blank chip in a desiccator.

[0037] (2) Regional functionalization: Chromium ions and mercury ions are colorimetrically figure 1 In the chip area shown, for chromium ions: add 15mg / mL of 1,5-diphenylcarbohydrazide and 40mg / mL phthalic anhydride in acetone, drop quickly to the first chromium ion color dev...

specific Embodiment 1

[0041] Specific Example 1: Preparation of Paper-Based Microfluidic Chip

[0042] According to the different color development conditions of chromium ions and mercury ions, different ion flow diagrams are designed, such as figure 1 As shown in the flow diagram of the chip, a hydrophobic dam-like structure is constructed by wax-jet printing technology.

[0043] The front of the filter paper is in a square area of ​​20mm×20mm, which is divided into four parts according to different functions: sample loading area, color development area, pretreatment area, and background control area. The sample loading area is a circle with a diameter of 12 mm, the color development area is a circle with a diameter of 3 mm, the pretreatment area is an ellipse with a major axis of 4 mm and a short axis of 2.5 mm, and the background control area is a circle with a diameter of 3 mm. Such as figure 1 As shown, the functional areas are: sample loading area 1, first mercury ion color area 2, second m...

specific Embodiment 2

[0045] Specific Example 2: Regional Functionalization

[0046] In the colorimetric part, for the chromium ion detection scheme, take 0.25 μL of 15 mg / mL 1,5-DPC and 40 mg / mL phthalic anhydride in acetone and quickly drop it into the first chromium ion color development area 4, the second In the dichromium ion color development area 4', the first chromium ion color development background control area 5 and the second chromium ion color development background control area 5'; take 0.25 μL of 15 mg / mL sodium sulfide aqueous solution and quickly add it dropwise to the first chromium ion color development area. In the ion pretreatment area 3 and the second chromium ion pretreatment area 3'; for the mercury ion detection scheme, take 0.25 μL of 0.15 mg / mL rhodamine-based color reagent acetonitrile solution, and quickly drop it in the first mercury ion color development area 2. The second mercury ion color development area 2', the first mercury ion color development background contro...

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Abstract

The invention discloses a paper-based micro-fluidic chip for detecting chromium and mercury ions in a water body as well as a preparation method and a detection method of the paper-based micro-fluidicchip. The paper-based micro-fluidic chip comprises a substrate provided with a plurality of functional areas; the functional areas comprise a sample loading area, a chromium ion color developing background control area, a mercury ion color developing background control area, a chromium ion color developing area and a mercury ion color developing area, wherein the chromium ion color developing area and the mercury ion color developing area respectively communicate with the sample loading area; a chromium ion pretreatment area is further arranged on a communication channel between the chromiumion color developing area and the sample loading area; 1,5-diphenyl carbohydrazide and phthalic anhydride are deposited in the chromium ion color developing area and the chromium ion color developingbackground control area, sodium sulfide is deposited in the chromium ion pretreatment area, and rhodamine color developing agents are deposited in the mercury ion color developing area and the mercuryion color developing background control area. Chromium and mercury ions in the water body can be detected at the same time, the anti-interference capability is high, and the sensitivity is high.

Description

technical field [0001] The invention relates to a paper-based microfluidic chip for simultaneously detecting chromium and mercury ions in a water body, a preparation method and a detection method thereof, and belongs to the technical field of rapid detection. Background technique [0002] With the rapid development of modern industry, environmental pollution incidents caused by human activities are also becoming more and more serious. The indiscriminate discharge of wastewater rich in heavy metal ions poses a serious threat to the survival and development of human society. Establishing a real-time and rapid heavy metal monitoring method has become a research focus and hot spot for scientific and technological workers. Although techniques such as atomic absorption spectroscopy and inductively coupled plasma emission spectroscopy have been widely used in the detection of heavy metal ions, the expensive instruments, complex data analysis process, and bulky equipment are not co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01L3/00G01N21/78
CPCB01L3/502707G01N21/78
Inventor 白雷杨永忠钱晓磊任映坤万广平侯博
Owner SHAANXI COAL & CHEM TECH INST
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