A kind of preparation method of the fluorescent test paper of rapid detection barium ion

A barium ion and fluorescence technology, which is applied in the field of analytical chemical testing, can solve the problems of substandard detection sensitivity, expensive instruments, and interference from other ions, and achieve the effects of wide discoloration range and high sensitivity that are conducive to promotion and popularization

CN109540857BActive Publication Date: 2021-05-04ANQING NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-05-04

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Abstract

The invention relates to a preparation method of fluorescent test paper for rapidly detecting barium ions. Fluorescent probes are used as color-developing inks, and filter paper is used as a solid-phase carrier by an inkjet printer to uniformly print to obtain fluorescent test paper for detecting barium ions; The fluorescent probe is a blue-light carbon dot functionalized with sodium rhodinate. The invention uses the principle of fluorescence quenching to construct blue-light carbon dots for visual detection of barium ions and has the advantage of a wide range of discoloration. As the concentration of the detected substance changes, the color of the fluorescent test paper changes from royal blue to light blue under the irradiation of a hand-held ultraviolet lamp. The color - light purple - light crimson - gray, can be quickly recognized by the naked eye.
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Description

technical field

[0001] The invention belongs to the technical field of analytical chemistry testing, and in particular relates to a preparation method of fluorescent test paper for rapidly detecting barium ions. Background technique

[0002] Barium is not an essential element for the human body, but it has a great impact on human health. Barium may be exposed to barium during the mining, smelting, manufacturing, and use of barium compounds. Barium and its compounds can enter the body through the respiratory tract, digestive tract and damaged skin. Occupational barium poisoning is mainly caused by inhalation of the respiratory tract, which is seen in accidents during production and use; non-occupational barium poisoning is mainly caused by ingestion of the digestive tract, mostly caused by accidental ingestion; liquid soluble barium compounds can be absorbed through wounded skin. Acute poisoning of barium is mostly caused by mistaken ingestion. Barium salt poisoning mainly...

Examples

Embodiment 1

[0020] Embodiment 1 The preparation method of the fluorescent test paper that detects barium ion rapidly

[0021] (1) Dissolve 1.0-5.0g of citric acid and 2-10mL of ethylenediamine in 20mL of ultrapure water, then transfer to a 30mL polytetrafluoroethylene reactor, and react at a temperature below 200°C for 4-8h to obtain blue light carbon dots. The obtained blue-light carbon dots were dialyzed for 24-48 hours with a dialysis bag with a cut-off molecular weight of 500;

[0022] (2) Disperse 10 mL of dialyzed blue light carbon dots in a 10.0-30.0 μmol / L sodium rhodinate solution, and stir for 1-3 hours to obtain a fluorescent probe solution.

[0023] (3) Wash the ink cartridge of the inkjet printer with ultrapure water, dry it to obtain a blank ink cartridge, inject the fluorescent probe solution into the blank ink cartridge with a syringe, and print a 7×2cm ink cartridge on ordinary filter paper. 2 Rectangle pattern, repeat printing 15-25 times, leave it for 8-12 minutes natu...

Embodiment 2

[0024] Embodiment 2 Barium ion adds the influence of different amounts on color development

[0025] Take the concentration as 1.0×10 -5 mol / L barium chloride standard solution 0.00mL, 0.05mL, 0.10mL, 0.20mL, 0.50mL, 1.00mL were put into six 10mL glass test tubes respectively, and deionized water 1.00mL, 0.95mL, 0.90mL were added respectively. mL, 0.80mL, 0.50mL, 0.00mL. Insert the fluorescent test paper prepared in Example 1 into the test tube to wet the test paper, (generally, there will be a color reaction within 10 minutes after wetting). Use a hand-held ultraviolet lamp to observe the influence of different concentrations of barium ions on the color reaction of the test paper. Along with the continuous increase of barium ion concentration, detection test paper color changes gradually among the present invention, thus shows that carbon dot fluorescence intensity changes gradually along with the concentration of barium ion continuous increase, and the color of detection so...

Embodiment 3

[0028] The detection of barium ion in embodiment 3 river water samples

[0029] Collect water samples to be tested S3.1~S3.4: Collect water samples with sample collection bottles at the same depth at different locations in the river, and place them for testing. Repeat the method used in Example 2 to measure aqueous solutions of known concentrations.

[0030] result

[0031] Observe the color change of the measured fluorescent test paper to determine whether the sample contains barium ions (see Table 1).

[0032] Table 1

[0033] sample number Color changes Measured S3.1 Undiscolored not measured S3.2 Undiscolored not measured S3.3 light blue Contains barium ions S3.4 Undiscolored not measured