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Bruzzone S.,University of Pisa | Chiappe C.,University of Pisa | Focardi S.E.,University of Siena | Pretti C.,University of Pisa | Renzi M.,Polo Universitario Grossetano
Chemical Engineering Journal | Year: 2011

Quantitative structure-toxicity relationships were developed for the prediction of toxicity to Vibrio fischeri using the CODESSA treatment. A four-parameter correlation was found for a class of ionic liquids based on halide. All the descriptors utilized are calculated only from the structures of the molecules, which makes it possible to predict unavailable or unknown ILs, in gas phase and in water (PCM treatment). Satisfactory correlations with the same descriptors were found for both cases but the employment of descriptors calculated in solvent assure a better correlation and a bigger reliability on the foresight. © 2011 Elsevier B.V.

Pretti C.,University of Pisa | Renzi M.,Polo Universitario Grossetano | Ettore Focardi S.,University of Siena | Giovani A.,Polo Universitario Grossetano | And 4 more authors.
Ecotoxicology and Environmental Safety | Year: 2011

N-Alkyl-. N-methylmorpholinium and N-alkyl substituted 1,4-diazabicyclo[2.2.2]octane (DABCO) based ionic liquids (ILs), N-alkyl-DABCO, bearing short alkyl chains are characterised by a low toxicity to Vibrio fischeri, although toxicity significantly increases on increasing the alkyl chain length. Alkyl chain length affects also biodegradability in the 28 days tests; the higher level of biodegradation was found in both the series in the case of the ethyl (C2) derivatives. In the case of N-ethyl DABCO based IL, although biodegradability is still around 40%, and consequently this IL cannot be classified as "readily biodegradable", this value is similar to the more biodegradable functionalized imidazolium based ILs. © 2010 Elsevier Inc.

Renzi M.,Polo Universitario Grossetano | Renzi M.,University of Siena | Mariottini M.,University of Siena | Specchiulli A.,National Research Council Italy | And 5 more authors.
Transitional Waters Bulletin | Year: 2013

1 - Total levels of persistent organic pollutants (polychlorinated biphenyls, organochlorine pesticides, and polycyclic aromatic hydrocarbons) in sediments and edible tissues (muscle and liver) from a fish species of great local commercial interest (Anguilla anguilla L., yellow phase) were determined in Varano and Orbetello lagoons, Italy. 2 - The aim of this study was to improve knowledge on relationships occurring among levels of chemicals in sediments and fish tissues relating them reciprocally and to different intensities of human pressure. 3 - Studied ecosystems were selected due to the notable scientific knowledge acquired by previous detailed research on meteorology, geomorphology, hydrodynamics, types and distribution of local factors linked to different sources of human-made pollution. Samplings were performed in July 2009 according to a logic model based on a priori defined factors of interest and obtained results were statistically analysed in order to evaluate the significance of observed data segregation related to the selected factors. 4 - Concerning levels measured in sediments, significant differences were observed between lagoons in terms of ΣPAHs and ΣOCPs. According to National and international recognised sediment quality guidelines, results evidenced the occurrence of non-critical POPs values in sediments. 5 - Results on sediments are associated to very high levels in eel's tissues. Concerning eels, Orbetello lagoon is characterized by significant higher values of ΣOCPs than Varano, evidencing the presence of an important OCPs local source. 6 - Different human pressure levels produce significant differences in both sediments and eel's tissues in Varano and Orbetello lagoons. © 2013 University of Salento- SIBA.

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