茜素红S与硼砂相互作用及其分光光度法测定铜  

On the interaction of alizarin red S with borax and spectrophotometric determination of copper

作　　者：吴小华[1] 吴兰菊[1] 陈建荣[1] 

机构地区：[1]浙江师范大学化学与生命科学学院,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2005年第1期51-53,共3页Journal of Zhejiang Normal University:Natural Sciences

摘　　要：研究了茜素红S (ARS) 与硼砂之间的相互作用及在硼砂缓冲体系中Cu(Ⅱ)与 ARS的显色反应.实验表明,ARS与硼砂结合形成了黄色配合物,使ARS的吸收光谱发生明显的紫移;在 pH 9.20的硼砂缓冲体系中,Cu(Ⅱ)与 ARS 形成了配位比为 1∶4 的红色配合物,其最大吸收波长为 540 nm,ε= 2. 00×104L·mol-1·cm-1,ρ(Cu(Ⅱ))在0~0.96μg/mL时符合比耳定律.方法用于铜合金中铜的测定,结果满意.The interaction of alizarin red S with borax and color reaction of Cu(Ⅱ) with alizarin red S were studied in borax buffer solution. Alizarin red S reacts with Borax to form yellow complex. It was found that obvious purple shift occurred of ARS′s absorption spectra. The results showed that (Cu(Ⅱ)) reacts with alizarin red S to form a stable 1∶4 chelate in pH 9.20 borax buffer solution. The apparent molar absorptivity of this chelate is 2.00×10~4 L5mol^(-1)5cm^(-1) at 540 nm. Beer′s law is obeyed in the range of 0～0.96 μg/mL for Cu(Ⅱ). The proposed method was applied to the determination of Cu(Ⅱ) in alloy with satisfactory results.

关 键 词：Cu(Ⅱ) ARS 配合物 茜素红S 配位 相互作用 吸收光谱 硼砂 分光光度法 最大吸收波长 

分 类 号：O657[理学—分析化学] R446[理学—化学]