某些金属-APDC螯合物微粒的共振光散射及其在痕量ClO_2分析中的应用  

Resonance Light Scattering Effect of Some Metal-Ammonium Pyrrolidinedithiocarbamate Chelate Complex Particles and Its Application to Determination of Trace Chlorine Dioxide

作　　者：赵长凤[1] 周丽琴[1] 黄春玉[1] 谢洪玲[1] 蒋治良[1] 

机构地区：[1]广西师范大学环境与资源学院,桂林541004

出　　处：《应用化学》2007年第5期551-555,共5页Chinese Journal of Applied Chemistry

基　　金：广西自然科学基金(No.0575042);广西师范大学博士科研启动基金资助项目

摘　　要：在NH3-NH4Cl缓冲溶液中,吡咯啶二硫代甲酸铵(APDC)可与金属离子反应形成螯合微粒和固液界面,显示出不同的颜色和共振散射峰。Cu(Ⅱ)-APDC、Pd(Ⅱ)-APDC、Ag(Ⅰ)-APDC、Ni(Ⅱ)-APDC、Co(Ⅱ)-APDC 5种螯合微粒体系分别在310、360、360、360和400 nm有1最强共振散射峰。在选定条件下,金属离子的浓度与其共振散射强度(IRS)成较好的线性关系。基于ClO2氧化APDC导致Cu-APDC螯合体系共振散射光强度线性降低,建立了一种测定7.56×10-9～756×10-9g/mL ClO2的共振散射光谱新方法。其回归方程ΔI=87.9cCl+0.55,相关系数为0.997 8,检出限为3.0×10-9g/mL ClO2。该法用于水样ClO2分析,结果满意。In NH3-NH4Cl buffer solutions, the reactions of ammonium pyrrolidinedithiocarbamate with some metal ions such as Cu（ Ⅱ ）, Ag（ Ⅰ ）, Pd（ Ⅱ ）, Ni（ Ⅱ ） and Co（ Ⅱ ） form chelate complex particles and yield a liquid-solid surface, which show different colors and resonance light scattering（RLS） effects. The five chelate particle systems, Cu （ Ⅱ ）-APDC, Ag（ Ⅰ ）-APDC, Pd（ Ⅱ ）-APDC, Ni（ Ⅱ ）-APDC and Co （ Ⅱ ）- APDC, exhibit resonance scattering peaks at 310 nm, 360 nm, 360 nm, 360 nm and 400 nm, respectively. Under the chosen conditions, there is a good linear relationship between the metal ion concentrations and the RLS intensity. When APDC in （Cu-APDC） was oxidized by ClO2, the RLS intensity of this system was reduced linearly with its concentration. Based on this fact, a new resonance scattering spectral method is proposed for the determination of 7.56 × 10^-9 - 756 × 10^-9 g/mL ClO2, with a detection limit of 3.0 ×10^-9 g/mL ClO2. Its regress equation is △I = 87.9CCl ＋ 0. 55, with a relative coefficient of 0. 997 8. It was applied to the analysis of ClO2 in water samples with a satisfactory result.

关 键 词：APDC Cu(Ⅱ)-APDC螯合物微粒 共振光散射 ClO2分析 

分 类 号：O657.6[理学—分析化学]