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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


MELO, Leônidas Carrijo Azevedo  and  SILVA, Carlos Alberto. Influence of digestion method and sample mass on the recovery of nutrients in organic residues. Quím. Nova [online]. 2008, vol.31, n.3, pp.556-561. ISSN 0100-4042.

The influence of nitric-perchloric, aqua regia, dry ashing and microwave digestion methods, in combination with 100 and 200 mg of sample, on the characterization and recovery of nutrients in samples of sludge sewage, poultry, swine, quail and bovine manures, organic compost, organic substrate and humic material were studied. Nitric-perchloric digestion with 200 mg samples recovered the higher nutrient contents. The nitric-perchloric method recovered also low levels of K. Dry ashing caused S volatilization and microwave digestion produced dark color extracts and this impaired S determination. Aqua regia recovered the lowest contents of nutrients in the organic residues evaluated.

Keywords : acid digestion; recovery index; nutrient content.

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