Evaluation of seawater contamination with benzene, toluene and xylene in the Ubatuba region and study of their degradation by ionizing radiation
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2007
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 8th/ MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 15th
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A major concern with leaking petroleum is the environmental contamination by toxic and low water-soluble
components such as benzene, toluene, and xylenes (BTX). These hydrocarbons have relatively high pollution potential
because of their significant toxicity. The objective of this study was to evaluate the contamination of seawater by the
main pollutants of the output and transport of petroleum, such as benzene, toluene, and xylenes, and their removal by
exposure to ionizing radiation. The studied region was Ubatuba region, SP, between 23º26’S and 23º46’S of latitude
and 45º02’W and 45º11’W of longitude, area of carry and output of petroleum, and samples were collected from
November, 2003 to July, 2005. For BTX in seawater analysis, the Purge and Trap concentrator with FIDGC detector
showed significantly higher sensibility than headspace concentrator with MSGC detector. The minimal detected limits
(MDL) obtained at FIDGC were of 0.50 g/L for benzene, 0.70 g/L for toluene, and 1.54 g/L for xylenes, and the
obtained experimental variability was 15%. While the concentrator type Headspace system with MS detector showed
higher MDL, about of 9.30 mg/L for benzene, 8.50 mg/L for toluene, and 9.80 mg/L for xylenes, and 10% of
experimental variability. In the studied area the benzene concentration varied from 1.0 g/L to 2.0 g/L, the
concentration of toluene varied from < 0.70 g/L to 3.24 g/L and the maximum value of xylenes observed was of 2.92
g/L. The seawater samples contaminated with BTX standard were exposed to ionizing radiation using a source of
60Co. The results showed a removal from 10% to 40% of benzene at 20kGy absorbed doses and concentration of 35.1
mg/L and 70.2 mg/L, respectively. For toluene the removal were from 20% to 60% with 15kGy and xylenes were
removed from 20% to 80% with 15kGy and similar concentrations.
Como referenciar
ALMEIDA, KELLY C.S. de; CARDOSO, VANESSA M.; MORI, MANOEL N.; DUARTE, CELINA L. Evaluation of seawater contamination with benzene, toluene and xylene in the Ubatuba region and study of their degradation by ionizing radiation. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 8th/ MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 15th, Sept. 30 - Oct. 5, 2007, Santos, SP. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/15701. Acesso em: 19 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.