Determination of lead in plant tissues: a pitfall due to wet digestion procedures in the presence of sulfuric acid
- 1 January 1992
- journal article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 117 (1) , 23-26
- https://doi.org/10.1039/an9921700023
Abstract
Two wet digestion procedures for the determination of lead in plant materials by electrothermal atomic absorption spectrometry have been evaluated. The combination of HNO3, H2O2 and HF, though leading to incomplete digestion, yielded values corresponding well with the reference or indicative values of the vegetal tissues used. The mixture of H2SO4, HNO3 and HClO4 gave results that were too low in some instances, owing to the formation of a mixed precipitate (Pb, Ba)SO4.Keywords
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