Data/hora: 22/06/2024 00:29:23

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 11/08/2004
Data da última atualização: | 08/03/2010
Autoria: | CARVALHO, E. R.; MILORI, D. M. B. P.; ROCHA, J. C.; MARTIN-NETO, L.
Título: | Interactions of chlorine and chlorine dioxide with tropical aquatic fulvic acids observed by fluorescence spectroscopy.
Ano de publicação: | 2004
Fonte/Imprenta: | In: INTERNATIONAL MEETING OF INTERNATIONAL HUMIC SUBSTANCES SOCIETY. -- IHSS, 12, São Pedro, SP, 2004. Humic substances and soil and water environment. Abstracts...[São Carlos], SP: Embrapa Instrumentação Agropecuária, 2004. p. 54.
Idioma: | Inglês

Conteúdo:

I. INTRODUCTION 
Biotic and abiotic processes play a significant role for HS genesis. The HS composition is often very heterogeneous and depends on geographical, climatic, physical and biological circumstances. In general, aquatic humic matter in fresh water ecosystems accounts for the major part of the dissolved organic carbon (DOC) and it is, an important precursor for harmful byproducts in the drinking water treatment processo The humic substances in a water supply is undesirable for several reasons, for instance: produce esthetically problems as colar in the water; stabilize dispersed and colloidal particles during coagulation processes; lead to formation of biodegradable organic compounds during ozonation and thereby enhance regrowth of microorganisms within the water-distribution systems. Besides these aspects, reactions between aquatic Humic Substanées (HS) and hafogen-based oxidants, during water chlorination process, can lead to the formation of trihalomethanes, with potential carcinogenic effects (Suffet and MacCarthy, 1989; Korshin et ai., 2001). 
In this work, the interactions of tropical aquaticfulvic acids (AFA) with chlorine and chlorine dioxide as well as identification of intermediates were ana.lyzed by fluorescence spectroscopy. Fluorescence spectroscopy is a very promísing, sensitive and useful technique for the study of environmental samples, like those containing humic substances.

Palavras-Chave: | Aquatic fulvic acids; aquatic humic substances; Cloração da água; Espectroscopia; Fluorescência; natural waters; photoluminiscence; Substâncias húmicas; trihalomethanes.
Thesagro: | Água.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)

Exemplares:

CNPDIA - (8322-1) - UMT - SP - -- - PROCI-04.00002 -  - 2004.00002 - DIS
CNPDIA - (8569-1) - UMT - SP - -- - PROCI-04.00066 -  - 2004.00066 - DIS