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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 shu

The Determination of Trace Amount of Pb by Flame Atomic Absorption Spectrometry after Separation and Preconcentration with Molecular Imprinting of Chitosan/Attapulgite

1.
a Institute of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094;
2.
b Huaiyin Institute of Technology, Huaian

Corresponding author: ZHONG Qin,
Received Date: 27 September 2010
Available Online: 24 February 2011
Fund Project: 江苏省自然科学基金项目(BK2008196) (BK2008196)

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.
- molecular imprinting technique,
- attapulgite,
- chitosan,
- separation and preconcentration,
- FAAS,
- Pb²⁺
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