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Description

a sets using digestion by two acids, usually hydrochloric and nitric acids, were excluded as method outliers based on statistical tests b sets using digestion using four acids, usually hydrochloric, nitric, hydrofluoric and perchloric acids, were included only based on statistical tests c sets by total recovery methods such as various fusions and instrumental neutron activation analyses were included only, the exclusion of sets by acid digestions as method outliers was based on statistical tests d sets using digestion by two or three acids, usually hydrochloric, nitric without/with hydrofluoric acid, were excluded as method outliers based on statistical tests e sets by combustion and fusion methods only were included