Herbicides, fungicides and bactericides containing\ud
heavy metals used in agriculture make it possible\ud
to find these toxic metals in beer (Čejka et al. in Ecol\ud
Chem Eng S 18:67–74, 2011). The aim of this work was to\ud
monitor the distribution of some toxic heavy metals such\ud
as cadmium (Cd), chromium (Cr), copper (Cu), nickel\ud
(Ni), lead (Pb) zinc (Zn), iron (Fe) and arsenic (As) during\ud
craft beers production (three types of beer produced in\ud
four different breweries). The instrumental method adopted\ud
in this investigation was inductively coupled plasma mass\ud
spectrometry. The collected results demonstrated how a\ud
very low (μg/L) heavy metal contamination (mainly Cr, Zn\ud
and Cu) was provided by raw materials (water, malt, hops\ud
and yeasts) and that these toxic metals mostly pass into the\ud
residuals (spent grains, hot trub and yeasts), so only a negligible\ud
fraction of them can be detected in beer. For example,\ud
treating hops with a high dose of pesticides containing Cu\ud
did not cause an increase in its content in final beer because\ud
a large part of copper remains in hot trub. Furthermore, the\ud
filtration phase caused the increase in the concentration of\ud
Cd, Zn, Fe and As, probably due to the use of filtration aids.\ud
These increases were insignificant healthwise [http://www.\ud
edqm.eu/en/Metals-and-alloys-used-in-food-contact-materials-\ud
and-articles-1st-Edition-(CouncilofEurope,2002)].\ud
The craft beers produced without the final filtration did not present this increase. Pb and Ni were always found below\ud
the detection limits