Toxicity evaluation of diethylene glycol and its combined effects with produced waters of off-shore gas platforms in the Adriatic Sea (Italy): Bioassays with marine/estuarine species

详细信息	查看全文 | 推荐本文 |

• 作者：Andrea Tornambè ; ^a ; ^{andrea.tornambe@isprambiente.it} ; Loredana Manfra^a ; Livia Mariani^a ; Olga Faraponova^a ; Fulvio Onorati^a ; Federica Savorelli^b ; Anna Maria Cicero^a ; Claudia Virno Lamberti^a ; Erika Magaletti^a
• 关键词：Off-shore platforms ; Diethylene glycol ; Produced waters ; Ecotoxicology ; Bioassay ; Marine/brackish organisms ; Effects-synergistic
• 刊名：Marine Environmental Research
• 出版年：2012
• 期刊代码：51_01411136
• 类别：env
• 出版时间：June, 2012
• 卷：77
• 期：Complete
• 页码：141-149
• 文件大小：315 K

摘要

Diethylene glycol (DEG) is commonly used to dehydrate natural gas in off-shore extraction plants and to prevent formation of gas hydrates. It may be released into the sea accidentally or in discharged produced waters (PWs). PWs samples from off-shore gas platforms in the Adriatic Sea (Italy) have been used in this study. The objectives of the study were: a) to evaluate the toxicity of DEG for marine organisms; b) to evaluate if a high DEG content in PWs may alter their toxicity; c) to verify whether the DEG threshold concentration established by the Italian legislation (3.5聽g/l) for PWs discharged at sea is safe for marine environment. Ten different species (Vibrio fischeri, Phaeodactylum tricornutum, Dunaliella tertiolecta, Brachionus plicatilis, Artemia franciscana, Tigropus fulvus, Mytilus galloprovincialis, Crassostrea gigas, Tapes philippinarum and Dicentrarchus labrax) have been exposed to DEG; four of these species were also exposed to PWs in combination with DEG. The results showed that: a) DEG is not toxic at levels normally detected in Adriatic PWs; b) DEG in combination with PW showed mainly additive or synergistic effects; c) short-term bioassays showed that the DEG limit of 3.5聽g/l could be acceptable.