Comparison of three digestion methods for the recovery of 17 plant essential nutrients and trace elements from six composts

摘要: A comparative investigation for recovery of 17 elements by using three digestion methods (nitric acid, nitric/perchloric acid and dry ashing) in six mature composts was conducted. The measured were Ca, Fe, K, Mg, Na, As, Cd, Co, Cr, Cu, Hg, Mn, Mo, Ni, Pb, Se Zn. Two the prepared from mixtures racetrack manure sewage sludge. Another compost developed a mixture food waste straw with addition nitrogen fertilizer. remaining MSW (municipal solid waste) Lunenburg Regional Recycling Composting Facility, Nova Scotia, 1995, 1996 1997, matured, used subsequent year. There no significant differences between procedures Hg. HNO3 provided highest Ni Se, HNO3/HClO4 while ashing Mn. For Cd both provided...