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A dose-sensitive visual test strip for detecting arsenic (iii) in water

A technology for detecting test strips and doses, which is applied in measurement devices, analysis by chemical reaction of materials, and material analysis by observing the effect on chemical indicators, to achieve high sensitivity, simple operation, and good selectivity.

Active Publication Date: 2019-08-09
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the deficiencies in the prior art and aims to provide a dose-sensitive visual detection test paper for detecting arsenic (III) in water. The technical problem to be solved is to utilize the properties of the multicolor quantum dot / carbon dot hybrid system Design of a Dose-Sensitive Visual Detection Method for the Contaminant Arsenic(III)

Method used

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  • A dose-sensitive visual test strip for detecting arsenic (iii) in water
  • A dose-sensitive visual test strip for detecting arsenic (iii) in water
  • A dose-sensitive visual test strip for detecting arsenic (iii) in water

Examples

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Embodiment 1

[0047] 1. Preparation of quantum dots with sulfhydryl surface functionalization

[0048] 0.1142g cadmium chloride (CdCl 2 ·2.5H 2 O) Add to 120mL of deoxygenated ultrapure water, then add 0.3838g of glutathione (GSH), then use 1M NaOH solution to adjust its pH to 10 to obtain a mixed solution; on the other hand, take 0.0319g of tellurium Add powder and 0.05g sodium borohydride to 3mL ultrapure water, under the protection of nitrogen, in an ice bath for 8 hours, the reaction produces sodium tellurium hydride, 10mL 0.5M sulfuric acid solution is injected into the resulting sodium tellurium hydride solution, and the formation is generated by nitrogen H 2 All Te is passed into the mixed solution, stirred for 20 minutes and then heated to reflux; the reflux reaction time is controlled to obtain glutathione-stable cadmium telluride quantum dots with a fluorescence emission peak between 490nm and 680nm. The prepared original solution of quantum dots was irradiated under a 15W ultraviole...

Embodiment 2

[0056] 1. Preparation of quantum dots with sulfhydryl surface functionalization

[0057] The preparation method of the sulfhydryl surface-functionalized quantum dots in this example is the same as that of Example 1.

[0058] 2. Preparation of carbon dots

[0059] The preparation method of the carbon dots in this example is the same as that of Example 1.

[0060] 3. Preparation of quantum dot / carbon dot hybrid system

[0061] Take 100μL of cadmium telluride quantum dots functionalized with sulfhydryl groups on the surface, add 6mL Tris-HCl buffer solution (0.1M, pH7.4), then add 50μL of cyan carbon dots, and mix well to obtain a quantum dot / carbon dot hybrid system. The fluorescence intensity ratio of cyan carbon dots to red quantum dots is 1:5.

[0062] 4. Preparation of test paper

[0063] Wash the ink cartridge of the inkjet printer with deionized water repeatedly until the residual ink in the ink cartridge is completely cleaned, and then put the cleaned ink cartridge in an oven at 50°...

Embodiment 3

[0068] 1. Preparation of quantum dots with sulfhydryl surface functionalization

[0069] The preparation method of the sulfhydryl surface-functionalized quantum dots in this example is the same as that of Example 1.

[0070] 2. Preparation of carbon dots

[0071] The preparation method of the carbon dots in this example is the same as that of Example 1.

[0072] 3. Preparation of quantum dot / carbon dot hybrid system

[0073] The preparation method of the quantum dot / carbon dot hybrid system in this embodiment is the same as that of Embodiment 2.

[0074] 4. Preparation of test paper

[0075] The preparation method of the test paper in this embodiment is the same as that of embodiment 2.

[0076] 5. Visual detection of arsenic (III) pollutants in tap water with test paper

[0077] The tap water containing arsenic (III) was added to the detection test paper for fluorescence visualization detection. There is a response at the content of 10ppb, the detection is sensitive, and the visual detect...

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Abstract

The invention discloses a dosage-sensitive visual detection test paper for detecting arsenic (III) in a water body. The visual detection test paper is prepared by assembling a quantum dot-carbon point mixed system onto filter paper in an ink-jet printing manner, with the filter paper as a solid-phase substrate, wherein the quantum dot-carbon point mixed system is formed by mixing surface mercapto-functionalized red quantum dots and cyan carbon dots, and a fluorescence intensity ratio of red quantum dots to cyan carbon dots is 9:1 to 1: 3. The detection test paper provided by the invention can rapidly detect the pollutant arsenic (III) in the water body in real time.

Description

[0001] 1. Technical Field [0002] The invention relates to a detection test paper, in particular to a dose-sensitive visual detection test paper for detecting arsenic (III) in a water body. [0003] 2. Background technology [0004] Arsenic (III) and its compounds are highly toxic substances in the environment and are confirmed carcinogens. Arsenic (III) mainly harms humans through exposure to water, and drinking water mainly contains As III And As V And other forms of inorganic arsenic (III). Long-term drinking of high arsenic (III) water can cause neuralgia, vascular damage, and increase the incidence of heart disease, hepatomegaly and even cirrhosis. At present, about 14.6 million people in the country are exposed to arsenic from drinking water (III) (> 0.03mg / L), the high arsenic (III) water is mainly groundwater. The high arsenic (III) water area in China involves 10 provinces (regions) including Xinjiang and Inner Mongolia, and endemic arsenic (III) poisoning patients have ...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N21/78
CPCG01N21/6428G01N21/78G01N2201/061
Inventor 张忠平都述虎周玉洁蒋长龙刘变化刘仁勇
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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