| At present, the chemical modified carbon paste electrodes has gradually gained its wide applications on biological analysis, pharmaceutical analysis, organic analysis and environmental detection and so on. In this paper, the matrix of the nickel chromium molybdenum alloy was adopted as a substrate to prepare the pre-anodized ultrathin carbon paste electrode by embedded on the surface of carbon paste and by cyclic voltammetric method in the solution of 0.20 mol/L Na OH, and research works are as following:1. The simultaneous determination of p-aminophenol, acetaminophen and guanine on the pre-anodized ultrathin carbon paste electrode based the nickel chromium molybdenum alloy.In this paper, a pre-anodized inlaying ultrathin carbon paste electrode was prepared on the basis of 316 L stainless steel scraps(316L-PAIUCPE) with a simple and rapid method. According to the relationship between the charge properties of the electrode surface active group, the formation and catalysis of hydrogen bonds, the degree of reduction reaction on the auxiliary electrode, molecular configuration, the distribution fraction of different shapes and oxidation peak potential with solution acidity, it discussed the effect of p H on the corresponding oxidation peak current of p-AP, ACOP and G in detail. The effect of the supporting electrolyte on peak current of them was also discussed. Under the optimum conditions, the oxidation peak current was proportional to the p-AP, ACOP and G concentrations in the range of 6.0×10-7~2.0×10-4mol·L-1, 8.0×10-7~3.5×10-4 mol·L-1and 2.0×10-7~1.0×10-4mol·L-1 with the detection limits of 7.86×10-8mol·L-1, 1.80×10-7mol·L-1 and 3.93×10-8mol·L-1, respectively. The method applied to the determination of p-AP, ACOP and G with satisfactory results.2. Study on the effects of solution acidity on the electrochemical behaviors of dopamine and tyrosine on the pre-anodized ultrathin carbon paste electrode based the nickel chromium molybdenum alloyIn this paper, a pre-anodized inlaying ultrathin carbon paste electrode was fabricated by simple and rapid method, which was on the base of a 316 L stainless steel scraps(316L-PAIUCPE). Setting dopamine(DA) and tyrosine(Tyr) as the analytes, the electrochemical properties of them on the electrode were studied. According to relationship between the formation and catalysis of hydrogen bonds, molecular configurationr and the degree of reduction reaction on the auxiliary electrode with p H, it discussed the effect of solution acidity on the corresponding oxidation peak current of DA and Tyr detailly. The oxidation peak current of DA and Tyr were linearly with their incresing concentrations in the range of 8.0×10-7 mol·L-1- 8.0×10-5 mol·L-1, 6.0×10-7 mol·L-1- 1.0×10-4 mol·L-1 with the detection limits of 9.6×10-8 mol·L-1 and 8.9×10-8 mol·L-1, respectively.3. Research on the simultaneous determination of etamsylate and dopamine and its reaction mechanism on the pre-anodized ultrathin carbon paste nickel chromium molybdenum alloy electrodeThe electrochemical properties of ETA of hemostatic etamsylate and DA of important neurotransmitters in the central nervous system of human on the pre-anodized inlaying ultrathin carbon paste 316 L electrode(316L-PAIUCPE) were studied in this paper. And it discussed the mechanisms of the effects of PH and supporting electrolyte on the reduction peak current of ETA and DA. The oxidation peaks of ETA and DA were overlaped, but their ΔEp of reduction peak was 140 m V and the simultaneous determination of ETA and DA was achieved based on it. Under the optimum conditions, The reduction peak current of ETA and DA were linearly with their incresing concentrations in the range of 7.0×10-7 mol·L-1~2.0×10-4 mol·L-1,6.0×10-7 mol·L-1 and 2.0×10-4 mol·L-1,with the detection limits of 9.7×10-8 mol·L-1 and 9.2×10-8 mol·L-1, respectively. The electrode showed stability and repeatability, and which can be used for detection the content of ETA and DA in hydrochloride injection. |
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