痕量多巴酚丁胺在碳糊电极上的吸附伏安行为及其痕量测定的研究

Adsorptive Voltammetry Behavior of Trace Dobutamine on Carbon Paste Electrode and Its Determination

在０．１ｍｏｌ／ＬＨ２ＳＯ４底液中，用碳糊电极吸附伏安法测定多巴酚丁胺，阳极峰电位为０．４６Ｖ（ｖｓ．ＳＣＥ），峰电流与多巴酚丁胺的浓度在３．０×１０－９～１．０×１０－６ｍｏｌ／Ｌ范围内呈良好的线性关系．该法检测下限为１．５×１０－９ｍｏｌ／Ｌ，回收范围为９４．００％～１０２．５９％，相对标准偏差为３．１％（ｎ＝９）．本文还对反应机理进行了初步探讨．

Dobutamine is determined by adsorptive voltammetry using a carbon paste electrode in a base solution of 0 1 mol/L H 2SO 4. The peak potential of anode is 0 46 V( vs . SCE). There is a good linear relationship between the peak current and the concentration of dobutamine in the range of 3 0×10 -9 ￣1 0×10 -6 mol/L. The detection limit of the method is 1 5×10 -9 mol/L. The recovery is 94 00%￣102 59%, and the relative standard deviation is 3 1%( n =9). The possible reaction mechanism is discussed.