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Determination of lead in vinegar by ICP-MS and GFAAS: evaluation of different sample preparation procedures.
Talanta
September 2004
Environmental Toxicology, WIGS University of California, Santa Cruz, CA 95064, USA; Institute of Applied Environmental Research (ITM), Stockholm University, Frescativagen 54, S-106 91 Stockholm, Sweden.
Lead concentrations of 59 different types of vinegars (15-307mugl(-1) in balsamic vinegars and 36-50mugl(-1) in wine vinegars) were determined using both inductively coupled plasma mass spectrometry (ICP-MS) and graphite furnace atomic absorption spectrometry (GFAAS). Although the precision of direct analyses, following simple aqueous dilutions, with either instrumental method was poor; that precision, following nitric acid and/or hydrogen peroxide digestions, markedly improved with either instrument and the values obtained with the two instruments were in good agreement. The efficacy of different digestions, including (1) nitric acid using a heating block, with or without addition of hydrogen peroxide and (2) mixtures of nitric acid and hydrogen peroxide using ultraviolet (UV) photolysis, were then assessed.
View Article and Find Full Text PDFSpeciation analysis of organolead compounds in wine by capillary gas chromatography/microwave-induced-plasma atomic emission spectrometry.
J AOAC Int
February 1994
University of Antwerp (U.I.A.), Department of Chemistry, Wilrijk (Antwerpen), Belgium.
A method was developed for the speciation analysis of ionic organolead compounds in wine. The analytes were extracted as diethyldithiocarbamate complexes into hexane and propylated with a Grignard reagent. The derivatized extract was analyzed by capillary gas chromatography/microwave-induced-plasma atomic emission spectrometry.
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