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8. | | SOUZA, R. M.; COELHO, M. S.; ALVES, B. J. R. Development of a method to prepare samples of plants material for determination of Ca, Cu, Mg, Mn, Fe and Zn by FAASA and P using complexometry. n RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 14., 2017, Vitória - Espirito Santo. Abstracts... Vitória - Espirito Santo: UFES, 2017. Biblioteca(s): Embrapa Agrobiologia. |
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12. | | BALIEIRO, F. de C.; ALVES, B. J. R. Nitrogênio total: Kjeldahl. In: TEIXEIRA, P. C.; DONAGEMMA, G. K.; FONTANA, A.; TEIXEIRA, W. G. (Ed.). Manual de métodos de análise de solo. 3. ed. rev. e ampl. Brasília, DF: Embrapa, 2017. pt. 3, cap. 2, p. 368-376. Biblioteca(s): Embrapa Solos. |
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Registros recuperados : 774 | |
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Registro Completo
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
27/06/1995 |
Data da última atualização: |
27/06/1995 |
Autoria: |
ALVES, B. J. R.; BODDEY, R. M.; URQUIAGA, S. S. |
Título: |
A rapid and sensitive flow injection technique for the analysis of ammonium in soil extracts. |
Ano de publicação: |
1993 |
Fonte/Imprenta: |
Communication in Soil Science and Plant Analysis, New York, v.24, n.3/4, p.277-284, 1993. |
Idioma: |
Inglês |
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. |
Palavras-Chave: |
Method; Mineral nutrient; N; Pasture. |
Thesagro: |
Amônia; Método; Mineral; Nitrogênio; Nutriente; Pastagem; Solo. |
Thesaurus NAL: |
ammonia; nitrogen; soil. |
Categoria do assunto: |
-- |
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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