1. The determination of iron, manganese, zinc and copper in plant material by paper chromatography and reflectance densitometry. Author Webb RA, Hallas DG, and Stevens HM Subjects Copper analysis, Indicators and Reagents, Iron analysis, Manganese analysis, Methods, Trace Elements isolation & purification, Zinc analysis, Chromatography, Paper, Densitometry, Plants analysis, Trace Elements analysis Published 1969 Full Text View/download PDF