罗丹明B-I_3^-离子缔合物共振散射测定环境水样中的铬Ⅵ和铬Ⅲ  

Determination of Cr Ⅵand CrⅢin Environmental Water by Resonance Scattering with the Ion Association Complex of Rhodamine B and I_3^-

作　　者：申金山[1] 李献锐[2] 

机构地区：[1]河北师范大学化学系,石家庄050016 [2]河北医科大学基础医学院,石家庄050017

出　　处：《分析化学》2001年第8期944-946,共3页Chinese Journal of Analytical Chemistry

摘　　要：研究了在磷酸介质中 ,罗丹明B与I-3的离子缔合物的共振散射光谱。确定了散射光强度与溶液中Cr 浓度的关系。提出了共振散射测定Cr 的新方法。方法的检出限为 2 .2 μg/L ,线性范围为1 0 .0～ 5 0 0 μg/L。结合离子交换分离法 ,用于环境水样中铬的形态分析 ,结果满意。The spectrum of KI-Cr?-Rhodamine B ion association complex has the resonance in phosphoric acid medium. Based on this phenomenon, we studied the relation between the intensity of resonance scattering and the concentration of Cr?. A new method was proposed for the determination of Cr? by resonance scattering. The linear range of the determination is 10.0～500 μg/L, the detection limit is 2.2 μg/L. This method has been applied to the speciation analysis of chromium in the environmental water and the result is satisfactory.

关 键 词：铬 形态分析 罗丹明B 共振散射 碘离子 缔合物 环境水样 三价铬 六价铬 

分 类 号：O657.3[理学—分析化学]