Three-electrode system, electrochemical sensor, preparation method thereof, electrochemical workstation and application thereof
A three-electrode system and electrochemical technology, applied in the field of detection, can solve the problems of quantitative detection of heavy metal ions, etc., and achieve the effects of large-scale industrial application, strong specificity, and increased conduction effect
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Embodiment 1
[0065] This embodiment provides a three-electrode system, such as figure 1 As shown, the three-electrode system includes a working electrode, a counter electrode and a reference electrode, and the surfaces of the conductive region 1 of the working electrode, the conductive region 2 of the reference electrode and the conductive region 3 of the counter electrode are all printed with a conductive layer, The conductive layer is a mixture of carbon paste ink and silver paste ink, wherein the molar ratio of carbon and silver in the conductive layer is 1:1, and the thickness of the conductive layer is 10 μm; the surface of the working area 4 of the working electrode is printed with carbon paste of nano-stainless steel material The ink layer has a thickness of 15 μm; the nano-stainless steel material is stainless steel nano-powder, and the particle size of the nano-stainless steel material is 800 nm; a silver chloride layer is printed on the surface of the working area 5 of the referen...
Embodiment 2
[0082] The three-electrode system and electrochemical sensor in this embodiment are the same as the three-electrode system and electrochemical sensor in Embodiment 1.
[0083] This embodiment also provides an electrochemical workstation for detecting the concentration of cadmium ions in rice, and the detection method is as follows:
[0084] (1) Weigh 0.1g of the rice sample to be tested and place it in 3% hydrochloric acid, shake it for 10min, add acetic acid buffer solution after centrifugation, adjust to pH=4.5 with sodium hydroxide solution (concentration is 10M), and obtain the pretreated sample;
[0085] (2) 150 μL of the obtained pretreated sample was pipetted, and the current intensity thereof was detected by an electrochemical workstation, and the concentration of cadmium ions in the pretreated sample was quantified according to the standard curve obtained in Example 1.
[0086] Based on the standard curve, the concentration of cadmium ions in the rice sample to be te...
Embodiment 3
[0089] The three-electrode system and electrochemical sensor in this embodiment are the same as the three-electrode system and electrochemical sensor in Embodiment 1.
[0090] The present embodiment also provides an electrochemical workstation for detecting the concentration of lead ions in rice, and the detection method is as follows:
[0091](1) Configure lead ion standard solutions with concentration gradients of 10 μg / L, 25 μg / L, 50 μg / L, 100 μg / L, and 200 μg / L, pass the lead ion standard solution through the above-mentioned electrochemical workstation to test its current intensity, pass the lead ion Standard solution concentration and its corresponding current intensity draw a standard curve;
[0092] (2) Take 0.1g of the rice sample to be tested and place it in nitric acid with a concentration of 5%, shake it for 10min, add 0.4M NaCl solution after centrifugation, and mix with 0.5M copper nitrate solution;
[0093] (3) 150 μL of the obtained pretreated sample was pipett...
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Abstract
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