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The effects of sample processing on amounts of nutrients and pollutants in composts

, : The effects of sample processing on amounts of nutrients and pollutants in composts. Verband Deutscher Landwirtschaftlicher Untersuchungs und Forschungsanstalten, Reihe Kongressberichte ( 32): 357-362

Sample processing for compost analyses was investigated in terms of representative results and environmentally compatible methods. By including coarse materials, e.g. wood, in the analysis heavy metal contents, except for Cr and Hg, were reduced by 11-15%. Thus samples should not be sieved. A comparison between sample digestion using aqua regia or nitric acid showed that the latter extracted more Pb, Cd, Cu and Zn while the values for Cr, Ni and Hg were lower than in the aqua regia digest.

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