Determination of Trace Pb in Environmental Samples by GF–AAS after Microsphere Phase Separation Eztraction
(0) A novel method is described for preconcentration and separation of trace Pb in environmental samples such as water, soil, plant and sediment using a microsphere phase separation extraction. After complexation with 2-5-Bromo-2-pyridylazo-5-diethylamino-phenol (5-Br-PADAP) in alkalescent medium, the analytes are extracted to 1-octanol in the present of co-solvent alcohol, and then adding water to change the phase ratio, the contained 5-Br-PADAP-Pb microsphere phase (200μL) separates out from the homogeneous solution, later the microsphere introduced into the graphite furnace (GF) and detected by atomic absorption spectrometry (AAS). The graphite furnace apparatus conditions such as pyrolysis or atomization temperature and the chemical variables affecting the separation phase were optimized. Detection limit (3σ) of 0.05μg/L, along with enrichment factors of 35 for Pb was achieved. The develop method was applied to the determination of trace lead in a series environmental reference materials. All of the results were found to be in reasonable agreement with the certified values. This simple method shows a great potential for determination other trace metals in environmental samples.
Microsphere phase separation eztraction Trace Pb environmental samples graphite furnace atomic absorption spectrometry
Wei Guo Wenjuan Liu Shesheng Jin Shenghong Hu Hongfei Zhang Yuee Peng
Lab of Circulation Industry Promotion Center Ministry of Commerce of the Peoples Republic of China Lab of Circulation Industry Promotion Center Ministry of Commerce of the Peoples Republic of China Faculty of Earth Sciences China University of Geosciences Wuhan, 430074, P. R. China
国际会议
上海
英文
4504-4507
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）