摘要
[目的]探讨用碘四氯化碳萃取光度法间接测定食品及水中痕量铜。[方法]在pH=3.0～4.0的介质中,Cu2+氧化I-定量析出I2(2Cu2++4I-=Cu2I2↓+I2),碘四氯化碳萃取光度法间接测定食品或水中的痕量铜。[结果]铜浓度在5.0～25.0μg/ml范围内,符合比耳定律,其摩尔吸光度系数为ε=9.0×104,检出限为5.0μg/ml。[结论]通过方法的回收率试验以及其它测定方法进行比较,得到了较为满意的结果。
[Objective]To explore the of Trace Copper in food and water by I2-CCl4 extracted Spectrophotomety. [Methods]In the medium（PH=3.0～4.0）Cu^2＋ could oxidize I^- and I2 was separated out. （2Cu^2＋ 4I^-=Cu2I2 ↓＋I2 ）. [Results]When the contents of copper was in the bound of 5.0～25.0 μg/ml, it accorded with Beer law, The copper was 9.0× 10^4 ,The detection limit was 5.0 μg/ml. [Conclusion]By recovery test and compared with other determination method,the result of this method is satisfactory.
出处
《预防医学论坛》
2005年第5期569-570,共2页
Preventive Medicine Tribune
