光化学催化动力学共振光散射法测定痕量铜  

Determination of trace copper by photochemical catalytic kinetics resonance light scattering method

作　　者：杨静[1] 廖力夫[1] 杨江柳[2] 袁金涛[1] 刘传湘[2] 

机构地区：[1]南华大学公共卫生学院,衡阳421001 [2]南华大学化学化工学院,衡阳421001

出　　处：《分析试验室》2007年第3期110-113,共4页Chinese Journal of Analysis Laboratory

摘　　要：在高压汞灯照射下的H2SO4介质中，铜能强烈催化异丙醇还原钼酸铵生成钼同多蓝的光化学反应，生成的钼同多蓝在表面活性剂聚乙烯醇（PVA）存在下与罗丹明B能形成稳定的红紫色缔合物，导致共振瑞利散射峰（RRS）显著增强。据此建立了光化学催化动力学共振光散射法测定痕量铜的新方法。铜离子质量浓度在0．002～0．40μg／mL范围内与RRS增强强度成良好的线性关系，方法的检出限为1．2ng／mL。本方法具有高灵敏度和好的选择性，用于测定自来水和河水中的铜。The photochemical reduction of ammonium molybdate with iso-propyl alcohol to form molybdenum poly blue can be remarkably catalyzed by trace copper with high-press mercury lamp irradiation in the medium of sulfate acid, and in the presence of Rhedamin B and pelyvinyl alcohol （PVA）, the molybdenum pely blue can be transformed to a stable reddish purple complex, which resulted in great enhancement of Resonance Rayleigh Scattering （RRS）. Based on this, a photochemical catalytic kinetics resonance light scattering method for the determination of trace copper was developed. The enhancement in the scattering intensity （AI） was linearly related to the concentration of copper in the range of 0.002 ～0. 40μg/mL with the detection limit of 1.2 ng/mL. The method is high sensitive, good selective and has been applied to the determination of trace copper in tap water and river water with satisfactory results.

关 键 词：铜 光化学反应 催化动力学 共振瑞利散射 

分 类 号：O657.32[理学—分析化学]