"So that the concentration of arsenic, selenium, antimony, bismuth, lead, tin, tellurium, germanium, indium, thallium, cadmium, zinc and other elements below the ppb level, with cold atomic mercury method..."
https://www.publico.pt/2012/12/03/jornal/angelo-correia-e-marques-mendes-surpreendidos-por-terem-sido-fundadores-25688684
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