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Sequential diffusion of ammonium and nitrate from soil extracts to a polytetrafluoroethylene trap for 15N determination



Sequential diffusion of ammonium and nitrate from soil extracts to a polytetrafluoroethylene trap for 15N determination



Analytica Chimica Acta 252(1-2): 201-203



A novel diffusion method was used for the preparation of NH4+- and NO3--N samples from soil extracts for 15N determination. Ammonium, and nitrate following reduction to ammonia, were allowed to diffuse to an acid-wetted glass filter enclosed in polytetrafluoroethylene tape. The method was evaluated with simulated soil extracts obtained using 50 ml of 2M potassium chloride solution containing 130 mu g of NH4+-N (2.3 atom% 15N) and 120 mu g of NO3--N (natural 15N abundance).

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Accession: 002219151

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DOI: 10.1016/0003-2670(91)87215-s


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