TY - JOUR
T1 - Sequential diffusion of ammonium and nitrate from soil extracts to a polytetrafluoroethylene trap for 15N determination
AU - Sørensen, P.
AU - Jensen, E.S.
PY - 1991
Y1 - 1991
N2 - A novel diffusion method was used for preparation of NH4+- and NO3--N samples from soil extracts for N-15 determination. Ammonium, and nitrate following reduction to ammonia, are 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 2 M potassium chloride solution containing 130-mu-g of NH4+-N (2.3 atom% N-15) and 120-mu-g of NO3--N (natural N-15 abundance). No cross-over in the N-15 abundances of NH4+-N and NO3--N was observed, indicating a quantitative diffusion process (72 h, 25-degrees-C). Owing to the presence of inorganic nitrogen impurities in the potassium chloride, the N-15 enrichments should be corrected for the blank nitrogen content.
AB - A novel diffusion method was used for preparation of NH4+- and NO3--N samples from soil extracts for N-15 determination. Ammonium, and nitrate following reduction to ammonia, are 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 2 M potassium chloride solution containing 130-mu-g of NH4+-N (2.3 atom% N-15) and 120-mu-g of NO3--N (natural N-15 abundance). No cross-over in the N-15 abundances of NH4+-N and NO3--N was observed, indicating a quantitative diffusion process (72 h, 25-degrees-C). Owing to the presence of inorganic nitrogen impurities in the potassium chloride, the N-15 enrichments should be corrected for the blank nitrogen content.
KW - Begrænsning af forurening
U2 - 10.1016/0003-2670(91)87215-S
DO - 10.1016/0003-2670(91)87215-S
M3 - Journal article
SN - 0003-2670
VL - 252
SP - 201
EP - 203
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 1-2
ER -