引用本文:
张强华, 石莹莹, 熊清平, 钟秦. 分子印迹壳聚糖/凹土分离富集-火焰原子吸收光谱测定痕量铅[J]. 应用化学,
2011, 28(9): 1073-1081.
doi:
10.3724/SP.J.1095.2011.00565
Citation: ZHANG Qianghua, SHI Yingying, XIONG Qingping, ZHONG Qin. The Determination of Trace Amount of Pb by Flame Atomic Absorption Spectrometry after Separation and Preconcentration with Molecular Imprinting of Chitosan/Attapulgite[J]. Chinese Journal of Applied Chemistry, 2011, 28(9): 1073-1081. doi: 10.3724/SP.J.1095.2011.00565
Citation: ZHANG Qianghua, SHI Yingying, XIONG Qingping, ZHONG Qin. The Determination of Trace Amount of Pb by Flame Atomic Absorption Spectrometry after Separation and Preconcentration with Molecular Imprinting of Chitosan/Attapulgite[J]. Chinese Journal of Applied Chemistry, 2011, 28(9): 1073-1081. doi: 10.3724/SP.J.1095.2011.00565
分子印迹壳聚糖/凹土分离富集-火焰原子吸收光谱测定痕量铅
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=0.9997,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。
English
The Determination of Trace Amount of Pb by Flame Atomic Absorption Spectrometry after Separation and Preconcentration with Molecular Imprinting of Chitosan/Attapulgite
Abstract:
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 0.999 7, 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.
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Key words:
- molecular imprinting technique
- / attapulgite
- / chitosan
- / separation and preconcentration
- / FAAS
- / Pb2+
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