作　　者： ; ; ; ;

机构地区： 淮阴工学院

出　　处： 《分析试验室》 2011年第11期56-59,共4页

摘　　要： 建立了用离子印迹壳聚糖/凹土(IICA)分离富集-火焰原子吸收光谱(FAAS)测定痕量镉的新方法。在动态吸附条件下,系统地研究了溶液pH值、流速、洗脱条件和干扰离子对痕量镉分离富集的影响;在pH4.5、上样流速为0.60 mL/min的条件下,镉能被IICA定量富集;吸附的镉可用1.0 mol/L HCl-0.1 mol/L甲基异丁酮的乙醇溶液在流速为0.96 mL/min条件下完全洗脱;优化条件下,IICA对镉的动态吸附容量为42.56 mg/g。线性范围为0.005～1.28 mg/L,r=0.9991,检出限(3σ,n=11)为0.97μg/L,相对标准偏差为1.3%(n=6,ρ=0.08 mg/L),回收率在97.5%～98.1%之间。 A new method for the determination of trace Cd^2 ＋ by flame atomic absorption spectrometry （FAAS） after separation and preconcentration with ions imprinting of chitosan/attapulgite （IICA） has been established. Under dynamic conditions, the optimal pH of the solution, flow rate and elution conditions were obtained for preconcentration of trace Cd^2＋. And the effect of interfering ions was also investigated. It was found that Cd^2＋ could be quantitatively preconcentrated on IICA at pH 4. 5. The flow rates of sample solutions and eluting solution with 1. 0 mol/L HC1 - 0. 1 mol/L methyl isobutyl ketone alcohol were 0. 60 mL/min and 0. 96 mL/min respectively. The dynamic adsorption capacity of Cd^2 ＋ on IICA was 42. 56 mg/g. The linear range for Cd^2 ＋was 0. 005 - 1.28 mg/L, with a correlation coefficient was 0. 9991, the detection limit（3σ, n = 11 ） for Cd^2 ＋was 0.97μg/L, and the relative standard deviation was 1.3% （n =6, p =0. 08 mg/L ）. The recovery was in the range of 97. 5% -98. 1%.

关 键 词： 离子印迹技术 凹土 壳聚糖 分离富集 火焰原子吸收光谱 镉

领　　域： [理学] [理学]