| 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 |
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| 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. |
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| 作者姓名： | 张强华 石莹莹 熊清平 钟秦 |
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| 作者单位： | (1.南京理工大学化工学院 南京 210094;2.淮阴工学院生化学院 淮安) |
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| 基金项目： | 江苏省自然科学基金项目(BK2008196) |
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| 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0.73 μg/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。
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| 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 |
| 收稿时间： | 2010-09-27 |
| 修稿时间： | 2011-02-04 |
The Determination of Trace Amount of Pb by Flame Atomic Absorption Spectrometry after Separation and Preconcentration with Molecular Imprinting of Chitosan/Attapulgite |
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| 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. |
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| Authors: | ZHANG Qianghua SHI Yingying XIONG Qingping ZHONG Qin |
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| Institution: | (1.Institute of Chemical Engineering，Nanjing University of Science & Technology,Nanjing 210094;
2.Huaiyin Institute of Technology，Huaian) |
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| 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 soluti... |
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| Keywords: | molecular imprinting technique attapulgite chitosan separation and preconcentration FAAS Pb2 |
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