Data/hora: 27/04/2024 07:19:01

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: 	--	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (17987-1) - UPC - AP - -- -  -  - 16083 - DIS