TY  - JA
AU  - Keeney,D.R.
AU  - Bremner,J.M.
TI  - Determination and isotope‐ratio analysis of different forms of nitrogen in soils: 4. Exchangeable ammonium, nitrate, and nitrite by direct‐distillation methods
SN  - 0361-5995
PY  - 1966///
CY  - Madison, WI (USA)
PB  - Soil Science Society of America, Wiley
KW  - Soil chemistry
KW  - AGROVOC
KW  - Ammonium
KW  - Nitrates
KW  - Nitrites
KW  - Nitrogen
N1  - Peer review
N2  - Methods of determining exchangeable ammonium, nitrate, and nitrite in soils which do not require extraction of the soil sample are described. The soil sample is treated with 2M KCl (5 ml/g of soil) and analyzed directly by steam‐distillation methods involving use of magnesium oxide for liberation of ammonium, ball‐milled Devarda alloy for reduction of nitrate and nitrite to ammonium, and sulfamic acid for destruction of nitrite. The methods are rapid, specific, and precise, and they permit nitrogen isotope‐ratio analysis of exchangeable ammonium, nitrate, and nitrite in N15‐tracer studies of nitrogen transformations in soils. Results of soil analyses by these direct‐distillation methods are practically identical to those obtained by extraction‐distillation methods
T2  - Soil Science Society of America Journal
DO  - https://doi.org/10.2136/sssaj1966.03615995003000050016x
ER  -