000			02448nab a22003737a 4500
999			_c61966 _d61958
001			61966
003			MX-TxCIM
005			20200601164720.0
008			180103s1966 xxu|||p|op||| 00| 0 eng d
022			_a0361-5995
022			_a1435-0661 (Online)
024	8		_ahttps://doi.org/10.2136/sssaj1966.03615995003000050016x
040			_aMX-TxCIM
041			_aeng
100	1		_913547 _aKeeney, D.R.
245	1	0	_aDetermination and isotope‐ratio analysis of different forms of nitrogen in soils : _b4. Exchangeable ammonium, nitrate, and nitrite by direct‐distillation methods
260			_aMadison, WI (USA) : _bSoil Science Society of America : _bWiley, _c1966.
500			_aPeer review
520			_aMethods 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.
546			_aText in English
650		7	_911453 _aSoil chemistry _2AGROVOC
650		7	_98774 _aAmmonium _2AGROVOC
650		7	_95760 _aNitrates _2AGROVOC
650		7	_913546 _aNitrites _2AGROVOC
650		7	_92912 _aNitrogen _2AGROVOC
700	1		_913545 _aBremner, J.M.
773	0		_gv. 30, no. 5, p. 577-582 _tSoil Science Society of America Journal _x1435-0661 _dMadison, WI (USA) : Soil Science Society of America : Wiley, 1966. _w444110
942			_2ddc _cJA _n0