【摘要】 运用电化学信号抑制法耦合微波消解技术测定鳗鱼中的六价铬离子。六价铬离子能够氧化槲皮素使其氧化峰电流得到抑制;考察缓冲液的pH值、富集电位、富集时间及可能存在干扰物质的影响因素。结果表明,六价铬离子在0.2～2.6nmol/L浓度范围内呈线性关系,线性相关性系数为0.9977,检出限为60.2pmol/L。该方法在过量的干扰离子存在条件下,表现出超灵敏性和有效性,建立的溶出伏安信号抑制法可用于鳗鱼中六价铬离子的分析检测。更多还原

【Abstract】 An electrochemical signal inhibition method coupled with microwave digestion was developed for ultra-sensitive determination of chromium(Ⅵ) in ell.Cr(Ⅵ) could be oxidized and the oxidation peak current was therefore inhibited.Factors affecting Cr(Ⅵ) determination such as buffer solution pH,enrichment potential,accumulation time and possible interferences were investigated.The developed method revealed excellent linearity over the Cr(Ⅵ) concentration of 0.2 to 2.6 nmol/L with a correlation coefficient 0.9977.The limit of detection was 60.2 pmol/L.This method proved ultra-sensitive and effective despite the presence of excess interference ions,thereby being applicable for the determination of Cr(Ⅵ) in eel.更多还原