Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
27/06/1995 |
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Data da última atualização: |
27/06/1995 |
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Autoria: |
ALVES, B. J. R.; BODDEY, R. M.; URQUIAGA, S. S. |
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Título: |
A rapid and sensitive flow injection technique for the analysis of ammonium in soil extracts. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Communication in Soil Science and Plant Analysis, New York, v.24, n.3/4, p.277-284, 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
The steam distillation technique for the quantification of soil mineral nitrogen is not well adapted to estimate very low levels of NH4+ and NO3- such as those found in tropical pastures. In this paper we describe a flow injection analysis (FIA) technique for the direct estimation of soil ammonium in potassium chloride extracts. The technique is based on the salicylate/hypochlorite colorimetric reaction with the resulting colouration read at 647 nm. The speed of the reaction was increased by immersing the reaction coils in a water bath maintained at 70oC. The technique was capable of accurately quantifying ammonium to concentrations as low as 0.05 mg NH4+-N/L (equivalent to 0.25 mg NH4+-N/g dry soil) and sample thoughputs of at least 60 samples per hour couldbe achieved. It was found that amino acids would also give a positive colorimetric reaction but that in the ten tropical soils examined this was not a significant source of error. |
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Palavras-Chave: |
Method; Mineral nutrient; N; Pasture. |
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Thesagro: |
Amônia; Método; Mineral; Nitrogênio; Nutriente; Pastagem; Solo. |
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Thesaurus NAL: |
ammonia; nitrogen; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01758naa a2200313 a 4500
001 1614517
005 1995-06-27
008 1993 bl uuuu u00u1 u #d
100 1 $aALVES, B. J. R.
245 $aA rapid and sensitive flow injection technique for the analysis of ammonium in soil extracts.
260 $c1993
520 $aThe steam distillation technique for the quantification of soil mineral nitrogen is not well adapted to estimate very low levels of NH4+ and NO3- such as those found in tropical pastures. In this paper we describe a flow injection analysis (FIA) technique for the direct estimation of soil ammonium in potassium chloride extracts. The technique is based on the salicylate/hypochlorite colorimetric reaction with the resulting colouration read at 647 nm. The speed of the reaction was increased by immersing the reaction coils in a water bath maintained at 70oC. The technique was capable of accurately quantifying ammonium to concentrations as low as 0.05 mg NH4+-N/L (equivalent to 0.25 mg NH4+-N/g dry soil) and sample thoughputs of at least 60 samples per hour couldbe achieved. It was found that amino acids would also give a positive colorimetric reaction but that in the ten tropical soils examined this was not a significant source of error.
650 $aammonia
650 $anitrogen
650 $asoil
650 $aAmônia
650 $aMétodo
650 $aMineral
650 $aNitrogênio
650 $aNutriente
650 $aPastagem
650 $aSolo
653 $aMethod
653 $aMineral nutrient
653 $aN
653 $aPasture
700 1 $aBODDEY, R. M.
700 1 $aURQUIAGA, S. S.
773 $tCommunication in Soil Science and Plant Analysis, New York$gv.24, n.3/4, p.277-284, 1993.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
