Sequential diffusion of ammonium and nitrate from soil extracts to a polytetrafluoroethylene trap for 15N determination
✍ Scribed by Peter Sørensen; Erik Steen Jensen
- Book ID
- 102624522
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 277 KB
- Volume
- 252
- Category
- Article
- ISSN
- 0003-2670
No coin nor oath required. For personal study only.
✦ Synopsis
A novel diffusion method was used for preparation of
NHfand NO;-N samples from soil extracts far 15N 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 pg of NH:-N (2.3 atom% I5 N) and 120 b$g of NOT-N (natural "N abundance). No cross-over in the "N abundances of NH:-N and Nor-N was observed, indicating a quantitative diffusion process (72 h, 25O C). Owing to the presence of inorganic nitrogen lSN enrichments should be corrected for rhe blank nitrogen content.