A kind of highly selective cadmium ion selective electrode and preparation method thereof
A selective electrode, high-selectivity technology, applied in the direction of material analysis, instruments, and measurement devices by electromagnetic means, can solve the problems of low imprinting efficiency, irregular product shape, etc., to achieve improved selectivity, uniform particle size distribution, Measure quick effects
Inactive Publication Date: 2020-09-15
BENGBU COLLEGE
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem of the block imprinted polymer prepared by the existing bulk polymerization method, the shape of the product is irregular, and the polymer obtained can only be obtained after grinding and sieving, and the imprinting efficiency is low. Problem, provide a kind of highly selective cadmium ion selective electrode and preparation method thereof
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[0032] 1. Preparation of Electrode Selectivity Sensitive Membrane:
[0033] Add 0.007g of sodium tetraphenylborate, 0.06g of cadmium ion imprinted polymer micro-nanospheres, 5mL of tetrahydrofuran, 0.2mL of dibutyl phthalate, 0.2g of polyvinyl chloride powder, and intermittently sonicate for 10min. In a glass ring with a diameter of 80 mm on a glass slide, let it dry naturally at room temperature for 24 hours to obtain a flexible and elastic cadmium ion selective sensitive membrane.
[0034] 2. Assembly of electrodes
[0035] Use 5% polyvinyl chloride powder tetrahydrofuran solution as an adhesive, stick the prepared film to the lower end of a PVC pipe with a diameter of 16mm, stick it firmly and dry it, and fill it with 10 -3 mol L -1 Cadmium standard solution, insert the Ag / AgCl electrode as the internal reference electrode, cover the electrode cap, draw the lead wire, and make the electrode. Use 10 before electrode use -3 mol L -1 After the cadmium standard solution ...
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The invention relates to a high-selectivity cadmium ion selecting electrode and a preparation method thereof. A cadmium ion selecting electrode sensitive membrane is adhered to the lower end of a PVCpipe, the PVC pipe is filled with 10-3 mol L-1 of cadmium standard solution, an Ag / AgCl electrode is inserted to serve as an internal reference electrode and is covered by an electrode cap, a lead is drawn out, and the high-selectivity cadmium ion selecting electrode is prepared. Cadmium ion-imprinted polymer nano-spheres, polyvinyl chloride, dibutyl phthalate, and sodium tetraphenylborate are dissolved in an appropriate amount of tetrahydrofuran, and the above solution is poured onto a glass sheet to be dried naturally, and the cadmium ion selecting electrode sensitive membrane is obtained.The core-shell type cadmium ion imprinted polymer micro / nano-spheres are applied to an analysis technology of the ion selecting electrode (ISE) for the first time, the functions of the ion selectingelectrode are further enhanced and improved, the performance is further improved, the electrode is more sensitive and reliable, the prepared ion selecting electrode has high selectivity, long servicelife, fast response and high sensitivity and can fast and accurately detect cadmium ions in the solution.
Description
technical field [0001] The invention belongs to an electrode used in the field of analysis and measurement, relates to an electrode used for detecting cadmium ions, in particular to a cadmium ion selective electrode with high selectivity for detecting cadmium ions and a preparation method thereof. [0002] technical background [0003] Excessive cadmium can cause harm to the human body, and cadmium can pollute the environment, so the quantitative detection of cadmium ions is of great significance. Potentiometric sensors are a large category of chemical sensors, also known as ionophore sensors, such as ion selective electrodes. The ion selective electrode is an electrochemical sensor based on the ion selective membrane potential changing with the ion concentration in the solution. The skeleton material of the sensing membrane of the potentiometric sensor is PVC, and the selectivity of the sensing membrane depends on the interaction between the active components such as ionoph...
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IPC IPC(8): G01N27/333
CPCG01N27/3335
Inventor 叶健李学良赵建军梅雪兰李倩徐从胜
Owner BENGBU COLLEGE