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Determination of lead in tea by graphite furnace atomic absorption spectrometry

Zhang Xiao-jun

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Abstract

Objective: The detection method of lead in tea was disussed,and Pb in 10 samples including 2 standards samples were determined.Methods: With matrix modifier,Pb in tea was determined by graphite furnace atomic absorption spectrometry.Results:(1)The proper conditions for determining Pb were ashing temperature 700℃ and atomizing temperature 2000℃ with NH4H2PO4 as a matrix modifier;(2)DL of Pb in the method was 1.1μg·L-1 and the recovery of the method was ranged from 94.0% to 108.8%;(3)Pb contents of 2 in 8 samples extracted from market were over 5mg·kg-1.Conclusion: This method is accurate and sensitive,it can meet the practical determination requirements.

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What this paper is about

Objective: The detection method of lead in tea was disussed,and Pb in 10 samples including 2 standards samples were determined.Methods: With matrix modifier,Pb in tea was determined by graphite furnace atomic absorption spectrometry.Results:(1)The proper conditions for determining Pb were ashing temperature 700℃ and atomizing temperature 2000℃ with NH4H2PO4 as a matrix modifier;(2)DL of Pb in the method was 1.1μg·L-1 and the recovery of the method was ranged from 94.0% to 108.8%;(3)Pb contents of 2 in 8 samples extracted from market were over 5mg·kg-1.Conclusion: This method is accurate and sensitive,it can meet the practical determination requirements.

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Available abstract

Objective: The detection method of lead in tea was disussed,and Pb in 10 samples including 2 standards samples were determined.Methods: With matrix modifier,Pb in tea was determined by graphite furnace atomic absorption spectrometry.Results:(1)The proper conditions for determining Pb were ashing temperature 700℃ and atomizing temperature 2000℃ with NH4H2PO4 as a matrix modifier;(2)DL of Pb in the method was 1.1μg·L-1 and the recovery of the method was ranged from 94.0% to 108.8%;(3)Pb contents of 2 in 8 samples extracted from market were over 5mg·kg-1.Conclusion: This method is accurate and sensitive,it can meet the practical determination requirements.

Key concepts: Ashing, Graphite furnace atomic absorption, Matrix (chemical analysis), Atomic absorption spectroscopy, Mass spectrometry, Chemistry, Graphite, Analytical Chemistry (journal)

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