2021DIN EN ISO 54321:2021 Soil, treated biowaste, sludge and waste - Digestion of aqua regia soluble fractions of elements (ISO 54321:2020); German version EN ISO 54321:2021
1970DIN EN ISO 54321 E:2019-12 Digestion of aqua regia soluble elemental fractions of soil, treated biological waste, sludge and waste (draft)