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Organic nitrogen compounds extracted from arable and forest soils by electro ultrafiltration and recovery rates of amino acids


Organic nitrogen compounds extracted from arable and forest soils by electro ultrafiltration and recovery rates of amino acids



Biology and Fertility of Soils 5(4): 271-275



ISSN/ISBN: 0178-2762

Extraction of synthetic amino acids dissolved in water by means of electro-ultrafiltration (EUF) showed average recovery rates of about 75%. Higher losses were obtained, particularly with cysteine, methionine and NH4+; the latter, probably being deprotonated at the cathode, may be lost in form of NH3. The EUF extracts of three arable and two forest soils were investigated for their N compounds. In the arable soils only about 3% of the total organic N extracted by EUF was free amino acids; about 23%-55% consisted of amino N (hydrolysable N) and the rest was non-hydrolysable N. The two forest soils contained higher amounts of EUF-extractable organic N compared with the arable soils. In the two forest soils the content of free amino-acid N amounted to 8% and 11% of the EUF-organic N, and the proportion of hydrolysable N from total EUF-organic N was 41% and 46%. It is suggested that the amino-acid N and the hydrolysable N can be easily mineralized.

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