DIN EN ISO 12782-4 E:2010-12 Geochemical model parameters for leaching and speciation of soil and material components Part 4: Extraction of humus from soil samples (draft)
2012DIN EN ISO 12782-4:2012-09 Soil quality - Parameters for geochemical modelling of leaching and speciation of constituents in soils and materials - Part 4: Extraction of humic substances from solid samples (ISO 12782-4:2012); German version EN ISO 12782-4:2012
2012DIN EN ISO 12782-4:2012 Soil quality - Parameters for geochemical modelling of leaching and speciation of constituents in soils and materials - Part 4: Extraction of humic substances from solid samples (ISO 12782-4:2012); German version EN ISO 12782-4:2012
1970DIN EN ISO 12782-4 E:2010-12 Geochemical model parameters for leaching and speciation of soil and material components Part 4: Extraction of humus from soil samples (draft)