Electrode for determining nitrate concentration in solution and manufacturing method thereof
A nitrate and electrode technology, applied in the field of electrochemical analysis, can solve problems such as slow charge transfer speed and difficult nitrate concentration, and achieve the effects of low cost, simple preparation method, and fast and simple testing process
Inactive Publication Date: 2012-05-09
CHONGQING UNIV
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Problems solved by technology
Many studies have found that Pd, Ni, Cd, Pt, Pd–Cu alloys, Pd–Sn alloys, and Cu-Zn have high electrochemical activity and selectivity for removing nitrate in solution and converting it into nitrogen, but using these electrodes It is very difficult to directly test the nitrate concentration in the solution, mainly because their charge transfer rate is relatively slow. Some nitrate electrodes require a pH less than 3.0 in the test environment to work normally, and some electrodes require additional pH during testing. Add reagent
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[0036] The present invention will be described in further detail below in conjunction with specific embodiments.
[0037] Such as figure 1 As shown, an electrode for measuring the concentration of nitrate in a solution includes a titanium metal wire 1 and a glass tube 2 that covers the titanium metal wire, and one end of the glass tube 2 shrinks to tightly wrap the outer wall of one end of the titanium metal wire 1, Only the end surface of the metal titanium wire is exposed to the glass tube, and granular nano-copper is deposited on the exposed end surface of the metal titanium wire.
[0038] The other end of the glass tube is open, and the other end of the metal titanium wire protrudes from the other end of the glass tube, and is encapsulated by an adhesive between the inner wall of the opening end of the glass tube and the metal titanium wire.
[0039] The adhesive is composed of epoxy resin and ethylenediamine, and the mass ratio of the two is 9-12:1, preferably 10:1.
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The invention provides an electrode for determining nitrate concentration in a solution, a manufacturing method thereof and a method for determining the nitrate concentration in the solution by using the electrode. The electrode comprises a titanium wire and a glass tube sleeved on the titanium wire, wherein one end of the glass tube contracts to tightly wrap the outer wall of one end of the titanium wire; only the end face of the titanium wire is exposed out of the glass tube; and particular nano copper is deposited in the naked end face of the titanium wire. The concentration of nitrate in the solution can be obtained by putting the electrode into a nitrate-containing solution to be determined according to x in a formula, i.e., y=a+bx, wherein y is a logarithmic value of more than ten of the concentration of nitrate, x is a logarithmic value of more than ten of electrode current, and a and b are linear coefficients. The electrode has high selectivity on nitrate in a neutral solution, no reagent is required to be added additionally during testing, the testing process is quick, simple and convenient, and a large scale of samples can be tested. Meanwhile, the manufacturing method is simple and quick, and has low cost.
Description
technical field [0001] The invention relates to the field of electrochemical analysis, in particular to an electrode for measuring the concentration of nitrate in a solution and a manufacturing method of the electrode. The invention also relates to a method for determining the concentration of nitrate in a solution by the electrode. [0002] Background technique [0003] As an environmental pollutant, nitrate exists widely in nature. A large amount of nitrate and other nutrients entering slow-flowing water bodies such as estuaries, lakes, and bays can easily cause eutrophication of water bodies, thereby polluting water bodies. Groundwater is an important source of water for many people, even the only source of drinking water. With the rapid development of industry and agriculture and the expansion of urban population, nitrate has become the most common pollution factor in groundwater, and its pollution level is increasing. When the nitrate content in drinking water reaches...
Claims
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Inventor陈猷鹏郭劲松宁运芳高旭方芳唐颖李珊
OwnerCHONGQING UNIV