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作 者:易兰花[1] 田俐[2] 费俊杰[1] 黎拒难[1]
机构地区:[1]湘潭大学化学学院,环境友好化学与应用省部共建教育部重点实验室,湖南湘潭411105 [2]湖南科技大学化学化工学院,湖南湘潭411201
出 处:《分析科学学报》2008年第3期331-334,共4页Journal of Analytical Science
基 金:中科院长春应化所电分析化学国家重点实验室基金(No.SKLEAC200510);湖南省教育厅青年项目(05B004)
摘 要:利用极谱分析仪,在0.40mol/L的HAc-NaAc(PH6.0)缓冲液中,发现靛红在碳糊电极(CPE)上有一灵敏的吸附伏安还原峰,峰电位为-0.44V(vs.SCE)。该还原峰的二阶导数峰电流与靛红的浓度在4.0×10^-8~1.0×10^-7 mol/L(富集90s)范围内成良好的线性关系,相关系数为0.9954,检出限为8.0×10^-9 mol/L(S/N-3,富集110s)。探讨了靛红在碳糊电极上的伏安性质和电极反应机理,并且成功应用于中草药青黛中靛红含量的测定。A highly selective and rapid cathodic adsorptive voltammetric method was developed for the determination of trace amount of isatin at a carbon paste electrode (CPE). The isatin was adsorbed on the surface of the CPE in 0.40 mol/L HAc-NaAc buffer solution (pH 6.0) yielding one reduction peak at -0.44 V (vs. SCE). The relationship between the peak current and isatin concentration was linear in a range of 4. 0×10^-8~1.0×10^-7 mol/L with a correlation coefficient 0. 9954. The detection limit was 8.0×10^-9 mol/L (S/N =3) for 110 s acummulation. The electrode reaction mechanism of isatin was investigated. The proposed method was applied to direct determine trace isatin in medicinal plant Qingdai with satisfactory results.
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