氰酸酯树脂修饰电极吸附伏安法测定食品中的砷(1)

http://www.100md.com 2007年8月1日 杨秋利

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     【摘 要】 研制了溴邻苯三酚红(BRP)作修饰剂的氰酸酯树脂修饰电极,并用此电极作工作电极建立了测定痕量砷的吸附伏安法。在选定的实验条件下,峰电流与As(Ⅲ)浓度在8.0×10^-10 ~ 2.0×10^-6mol /L范围内呈线性关系,检出限为2.0×10^-10mol /L ,10次测定相对标准偏差为2.0%,不用分离,可直接测定食品中痕量As (Ⅲ),测定的回收率为98 %～106%。

    【关键词】 砷 食品 氰酸酯树脂修饰电极 吸附伏安法

    DETERMINATION OF TRACE ARSENIC IN FOOD BY ADSORPTIVE STRIPPING VOLTAMMETRY BY A MODIFIED CYANATE ESTER RESIN ELECTRODE

    YANG Qiu-li (Shanxi Huashan Medical Technical School,714203 Huayin,China)

    【Abstract】 A bromopyrogallol red modified cyanate ester resin electrode was prepared and employed as a working electrode for the selective preconcentration and determination of As(Ⅲ). The adsorptive stripping voltammetry for the determination of As(Ⅲ)was studied in detail. The congditions which affect the determination was discussed ......

    http://www.100md.com/html/paper/1672-5085/2007/08/02.htm

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