Data/hora: 24/09/2024 07:11:43

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	02/03/1999	
Data da última atualização: 	02/03/1999	
Autoria: 	PIERSON, E. E.; CLARK, R. B.	
Afiliação: 	Department of Agronomy and U.S. Department of Agriculture, Agricultural Research Service. University of Nebraska. Lincloln.	
Título: 	Chelating agent differences in ferrous iron determinations.	
Ano de publicação: 	1984	
Fonte/Imprenta: 	Journal of Plant Nutrition, v.7, n.1/5, p.91-106, 1984.	
Idioma: 	Inglês	
Conteúdo: 	Experiments were conducted to test the ability of ferrous iron (Fe2+) chelating agents to discriminate between Fe2+ and ferric iron (Fe3+), to determine ranges of Fe2+ detection in reactions, to determine interactions of chelating agents with phosphorus (P) which is common inplant tissue, and to evaluate some of the complexities of methodology for Fe2+ determinations. PDTS [ferrozine; 3-(2pyridyl)-5,6-bis (4-phenyl-sulfonic acid)-1,2,4-triazine] reacted with only small amounts of Fe3+, had a fairly wide range  of Fe2+ detection (0-200 ug), P did not interfere with the reactions, and methodology was relatively simple. TPTZ [2,4,6-tropyridy1-s-triazine] was very specific for Fe2+, did not react with Fe3+, had a relatively narow range of Fe2+ detection (0-40 ug), P did not interfere with the reaction, and methodology was relatively simple. BDPS [4,7-diphenyl 1,10-phenanthrolinedifulfonic acid] reacted with a small amount of Fe3+, had a fairly wide range of Fe2+ detection (40-200 ug), did not react with low levels of Fe2+ (<40 ug), P did not interfere with the reaction, and the methodoloty was relatively simple. OPh [1,10 -o-phenanthroline] reacted extensively with Fe3+, had a wide range of Fe2+ detection (0-200 ug), P did not interfere with the reaction, and methodology was relatively simple. BDTPS [2,4-bis(5,6-diphenyl-1,2, 4-triazine-3-y1)-pyridinetetrasulfonic acid], BPT [4,7-diphenyl-1-1,10-phenanthroline, and PDT [3-(2pyridyl)-5,6-diphenly-1,2,4-triazine] were considered, but the literature indicated that P interferred with BDTPS and BPT reactions, citrate interferred with the BPT reactions, and the methodologies for PDT and BPT were relatively complex (required special separations and extractions). PDTS was the best of the chelating agents tested for Fe2+ determinations. OPh plus hydroxylamine (OPhH) was the best of the chelating agents for the determination of total Fe.  	
Palavras-Chave: 	Analysis; Chelating agent interactions; Interacao de agente quelifero; Iron nutrition.	
Thesagro: 	Análise; Ferro; Nutrição.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (36863-1) - ADD - SP - -- - SP3709 -  - 3709 - DIS