镉(Ⅱ)-碘化钾-亚甲基蓝体系共振瑞利散射光谱法测定痕量镉

Chemistry(2015)

Cited 23|Views0
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Abstract
利用Cd2+-I--[MB]+三元体系,研究了共振瑞利散射光谱(RRS)测定Cd(Ⅱ)的方法,考察了酸度、试剂的用量对测定的影响,优选出最佳测定条件.在磷酸介质中,Cd(Ⅱ)与碘化钾、亚甲基蓝生成稳定的三元配合物[CdI4] MB2,于λmax=592.6nm处测定RRS光谱强度,进而可确定Cd2+的含量.本法操作简便、快速、灵敏度高,Cd2+的线性范围在8.000×10-8~1.200×10-7mol/L,方法检出限为3.9×10-8mol/L,适用于各种环境水样中Cd(Ⅱ)的分析检测.
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Key words
potassium iodide
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