A pre-treatment method to improve total-N analysis of organic wastes (a preliminary investigation)

acide nitrique acido nitrico analytical methods azote desechos alimentarios engrais organique experimentation food wastes granule granules granulos comprimidos inorganic fertilizers lodos residuales manejo de desechos mezclado mixing nitric acid nitrogen organic fertilizers organic wastes pellet pellets sewage sludge technique analytique waste management