作　　者： ; ; ; ;

机构地区： 南京理工大学化工学院

出　　处： 《应用化学》 2011年第9期1073-1081,共9页

摘　　要： 建立了用分子印迹壳聚糖/凹凸棒石(MICA)分离富集-火焰原子吸收光谱(FAAS)测定痕量铅的新方法。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铅分离富集的影响;在pH=4.5,上样流速为0.60 mL/min的条件下,铅能被MICA定量富集;吸附的铅可用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;在优化条件下,MICA对铅的动态吸附容量为36.78 mg/g。线性范围为0～1.28 mg/L,r=0.999 7,检出限(3σ,n=11)为0.73μg/L,相对标准偏差为1.69%(n=6,ρ=0.08 mg/L),回收率在98.7%～101.4%之间。该方法操作简便、线性关系良好、灵敏度和精密度高,应用于实际水样中痕量铅的测定,结果满意。 A new method for the determination of trace Pb2＋ by flame atomic absorption spectrometry（FAAS） after separation and preconcentration with molecular imprinting of chitosan/attapulgite（MICA） has been established.Under dynamic condition,the optimal pH of the solution,flow rate,elution conditions were obtained for preconcentration of trace Pb2＋.And the effect of interfering ions was also investigated.It was found that Pb2＋ could be quantitatively preconcentrated on MICA at pH=4.5.The flow rates of sample solutions and eluting solution with 1.0 mol/L HCl-0.1 mol/L methyl isobutyl ketone alcohol were 0.60 mL/min and 0.96 mL/min,respectively.The dynamic adsorption capacity of Pb2＋ on MICA was 36.78 mg/g.The linear range for Pb2＋ was 0~1.28 mg/L,correlation coefficient was 0.9997,detection limit（3σ,n=11） for Pb2＋ was 0.73 μg/L,and the relative standard deviation was 1.69%（n=6,ρ=0.08 mg/L）,the recovery was in the range of 98.7%~101.4%.The method is convenient,highly precise and linear in a wide range.The method has been applied to the determination of trace amount Pb2＋ in water samples with satisfactory results.

关 键 词： 分子印迹技术 凹凸棒石黏土 壳聚糖 分离富集 火焰原子吸收光谱 铅

领　　域： [理学] [理学]