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《Chinese Journal of Analysis Laboratory》 2011-11
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The determination of a trace amount of Cd in water by FAAS after separation and preconcentration with imprinting of chitosan/attapulgite

SHI Ying-ying,ZHANG Qiang-hua,XIONG Qing-ping and CAO Lin(Huaiyin Institute of Technology,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province,Huaian 223003)  
A new method for the determination of trace Cd2+ 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 Cd2+.And the effect of interfering ions was also investigated.It was found that Cd2+ could be quantitatively preconcentrated on IICA 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 Cd2+ on IICA was 42.56 mg/g.The linear range for Cd2+ was 0.005~1.28 mg/L,with a correlation coefficient was 0.9991,the detection limit(3σ,n=11) for Cd2+ was 0.97 μg/L,and the relative standard deviation was 1.3%(n=6,ρ=0.08 mg/L).The recovery was in the range of 97.5%~98.1%.
【Key Words】： Ion imprinting technique Attapulgite Chitosan Separation and preconcentration FAAS Cd2+
【Fund】： 江苏省自然科学基金项目(BK2008196);; 淮安市工业支撑项目(HAG2010011)资助
【CateGory Index】： O657.31;X832
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