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| Determination of Lead and Cadmium in Rice by Flame Atomic Absorption Spectroscopy after Separation and Preconcentration Using Crosslinked β-Cyclodextrin Modified with TETA |
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| DOI： |
| KeyWord:β-cyclodextrin（β-CD） separation and preconcentration flame atomic absorption spectrometry(FAAS) rice lead cadmium |
| Author | Institution |
| XIAO Yan,ZHOU Fang-qin*,PENG Jia,LIAO Yun-xia |
湘潭大学化学学院环境友好化学与应用省部共建教育部重点实验室 |
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| Abstract: |
| A novel adsorbent material,triethylenetetramine modified β-cyclodextrin crosslinked resins（TETA-β-CDP）was synthesized,and the synthesized material was characterized by Fourier transform infrared spectrometry（FT-IR）.The conditions of adsorption and desorption of the adsorbent material for Pb2+ and Cd2+ were optimized，and a new method was developed for the determination of trace lead and cadmium in rice by atomic absorption spectroscopy.It was found that,in the conditions of pH 5.5 and flow rate of sample solution of 1.0 mL/min,the lead and cadmium could be quantitatively preconcentrated on TETA-β-CDP separation resin with adsorption capacities of 22.8 mg/g and 31.3 mg/g,respectively.The adsorbed lead and cadmium could be eluted with 0.1 mol/L HCl at a flow rate of 0.8 mL/min.Under the optimum conditions,the calibration curves were linear over Pb2+ and Cd2+ concentrations in the ranges of 0.2-20 mg/L and 0.05-2.5 mg/L,with detection limits（3σ,n=11）of 0.038 mg/L and 0.016 mg/L,respectively.The relative standard deviations（RSDs）for the determination of 0.5 mg/L Cd2+ and 5 mg/L Pb2+ were 1.7%and 2.8%,respectively.The spiked recoveries of lead and cadmium were in the ranges of 97.5%-101.0%and 95.0%-102.5%,respectively.The method was applied in the determination of trace lead and cadmium in rice samples with satisfactory results. |
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