Data/hora: 22/06/2024 01:51:33

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	26/07/1995	
Data da última atualização: 	26/07/1995	
Autoria: 	HOLTZCLAW, K. M.; SPOSITO, G.	
Título: 	Analytical properties of the solube, metal-complexing fractions in sludge-soil mixtures: III.Unaltered anionic surfactants in fulvie acid.	
Ano de publicação: 	1978	
Fonte/Imprenta: 	Soil Science Society of America Journal, v.42, n.4, p.607-610, July/Aug. 1978.	
Idioma: 	Inglês	
Conteúdo: 	A rapid analytical procedure was developed for the quantititative determination of unbiodegraded anionic surfactants in the fulvic acid fraction of sewage sludge. This procedure, which is a modification of the methyl green method of Moore and Kolbeson, consists of: (i) hydrolysis in 4N HCl, (ii) separation on an anion exchange resin, (iii) extraction of a methyl green-surfactant complex into benzene, and (iv) colorimetric determination of the complex. The modified procedure is free of the nehative interferences that occurred when the original methyl green method was applied to a sludge-derived fulvic acid and does not require specialized reagents or expensive instrumentation. An application of the modified procedure to two representative fulvic acids extracted from anerobically-digested sewage sludges indicted that about 5% of the dry mass of a sludge-derived fulvic acid (water- and ash-free basis) may be attributed to unaltered anionic surfactant compounds. This result suggeste that a significant aspect of the chemistry of agricultural soils into which sewage sludge has been incorporated will be reactions involving both unaltered and partially biodegraded anionic surafactants. 	
Palavras-Chave: 	Biodegradabilidade; Biodegradability of surfactants; Detergent; Metodo analitico.	
Thesagro: 	Detergente; Solo.	
Thesaurus Nal: 	analytical methods; soil.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (28713-1) - ADD - SP - -- - SP0403 -  - 0403 - DIS