【摘要】 利用硫脲和Co2+对镉易挥发组分的形成有增强作用,建立了无色散原子荧光光谱直接测定海水中痕量镉的方法,检出限为0.044μg/L,对镉含量为2.08μg/L的样品进行11次测定,RSD为4.0%,线性范围为0～20μg/L。对国家二级海水标准物质进行测定,结果与标准值相符。更多还原

【Abstract】 Based on the enhancement effect of thiourea and Co²⁺ on formation of cadmium volatile component, a method for the direct determination of trace cadmium in seawater by atomic fluorescence spectrometry was established.The detection limit of the method was 0.044 μg/L for Cd with dynamic linear range of 0～20 μg/L. The analytical precision for the sample with ρ（Cd）=2.08 μg/L was 4.0% RSD （n=11）. The method has been applied to the determination of trace Cd in standard reference seawater sample \ with satisfactory results.更多还原