摘要
采用纳米金／碳球（Au／CS）复合物修饰硼掺杂金刚石（BDD）电极，研究了苏丹红I号在Au／CS修饰BDD电极上的电化学行为，并据此建立了实际样品中的苏丹红I号的测定方法．结果表明，与裸BDD电极相比，苏丹红I号在Au／CS修饰BDD电极上的氧化峰电流由0．24pA增加到0．83μA，峰电位由0．809V负移到O．743V．在最优测试条件下，苏丹红I号浓度与其峰电流在4～100pmol／L范围内呈线性关系，线性方程为1P=O．01126c＋0．116（R2=0．999），检出限为8．33μmol／L．采用本方法对实际样品中的苏丹红I号进行测，测定结果及平均回收率均优于BDD电极法．
Au nanoparticles/carbon sphere （Au/CS） composite was adopted to modify boron- doped diamond （BDD） electrode. The electrochemical behavior of Sudan red I on Au/CS-modi- fled BDD electrode was investigated, and the method for testing Sudan red I in practical sam- ples was established accordingly. Results indicate that, as compared with bare BDD electrode, the oxidation peak current of Sudan red I on Au/CS-modified BDD electrode increases from 0.24/A to 0.83/A, and the oxidation peak potential negatively shifts from 0.809 V to 0.743 V. Under the optimized condition, the peak current is proportional to Sudan red I concentration in the range of 4--100 /mol/L, the linear equation is Ip= 0.011 26 c @0.116 （R2= 0.999）, and the detection limit is 8.33 /,mol/L. The present method can be used to detect Sudan red I in practical samples with better detection results and average recovery than those of BDD elec- trode method.
出处
《化学研究》
CAS
2014年第2期124-127,共4页
Chemical Research
关键词
纳米金
碳球
硼掺杂金刚石电极
苏丹红I号
电化学行为
Au nanoparticles/carbon spheres
BDD electrode
Sudan red I
electrochemical be- havior
