Gong A, Zhu X, Huang X, Zhang Y. The determination of trace lead in Chinese medicinal herbs by flow injection analysis in polyethyleneglycol medium.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008;
69:189-92. [PMID:
17452121 DOI:
10.1016/j.saa.2007.03.027]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2006] [Revised: 03/15/2007] [Accepted: 03/19/2007] [Indexed: 05/15/2023]
Abstract
In this work, a new flow injection analysis (FIA) for the determination of Pb(2+) in Chinese medicinal herbs was developed. In the buffer solution of borax-NaOH (pH 10.5), Pb(2+) reacted with 2-[(5-bromo-2-pyridyl)-azo]-5-(diethyl-amino)phenol (5-Br-PADAP) to form a complex. The experimental results showed that the sensitivity was enhanced in the presence of polyethyleneglycol-800 (PG-800). The main factors affecting the determination were investigated in detail. Under the optimum conditions, the linear range and detection limit is 0.0-0.3microg/mL and 1.5ng/mL (correlation coefficient r=0.9996), respectively. The linear regression equation is A=-0.005+0.60c (microg/mL). The sample throughout is 10h(-1). Foreign substrates effects were also investigated. The proposed method has been successfully applied to the determination of lead in reference material, goldthread and lepidium seed.
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