Lead Determination. FI-HG-AAS was used as the analytical
technique. For all assays we injected 500 íL of sample
under a nitric acid flow. An on-line microwave oven was used
immediately after the samples of beer or cider were injected
under nitric acid flow to enhance efficiency and decrease
interferences from the matrix. An ice bath was used to cool
the sample before it was placed in the oven to reduce the
pressure caused by water vapor. The optimum conditions for
lead hydride generation in each sample are summarized in
Table 1. The same procedure was used for blanks. An
aqueous calibration graph and the standard additions method
were used.