Cd(Ⅱ)-碘化钾-结晶紫-OP10反应的分光光度研究及应用

Spectrophometric determination of trace-amount cadmium in water by Cd(II)- KI-CV-OP10 system

〔目的〕为研究灵敏而简便的环境水样中痕量镉测定技术。〔方法〕在表面活性剂OP -10存在下 ,镉与结晶紫、碘化钾形成混配缔合物 ,建立了测定水体中痕量镉的光度法。〔结果〕该缔合物的最大吸收波长在 63 5 .9nm ,表观摩尔吸光系数ε为 1.0 4× 10 6 L mol·cm ,回收试验的相对标准偏差为 1.15 % -2 .68% ,回收率为 99.0 % -10 0 .8% ,在 0 -1.0 μgCd/10ml范围内服从比尔定律。〔结论〕该体系是测定镉的超高灵敏度光度法之一。本方法用于环境水样及中镉的测定 ,获得了满意结果。

Objective To seek a method for detection of trace-amount cadmium in environmental water.〔Methods〕 In the presence of the surface active agent of OP10,cadmium was placed to react with I- and CV to form the stable complex.〔Results〕 The complex exhibited maximal absorptivity at 635.9 nm.The molar absorption coefficient was 1.04×106 L/mol(cm. The recovery factor was 99.0%-100.8%.Beer's law was obeyed in the range of 0-1.0μg Cd/ml.〔Conclusions〕The method can be used for rapid detection of cadmium in environmental water.