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Publication MIO : Andrea Paluselli (MIO) , Vincent Fauvelle (MIO), François Galgani, and Richard Sempéré (MIO) - Phthalate Release from Plastic Fragments and Degradation in Seawater

Version imprimable de cet article

Environ. Sci. Technol., 2019, 53 (1), pp 166–175
DOI : 10.1021/acs.est.8b05083
Publication Date (Web) : November 27, 2018

L’article intitulé "Plastique dans les Océans : facteurs influant la libération d’additifs" paru sur le site du CNRS-INSU évoque cette publication

Abstract :

Plastic debris in the environment contains plasticizers, such as phthalates (PAEs), that can be released during plastic aging. Here, two common plastic materials, an insulation layer of electric cables (polyvinyl chloride, PVC-cables) and plastic garbage bag (polyethylene, PE-bags), were incubated in natural seawater under laboratory conditions, and the PAE migration to the seawater phase was studied with varying light and bacterial conditions over a 90-day time course. Free PAEs diluted in seawater were also studied for bacterial degradation. Our results showed that, within the first month of incubation, both plastic materials significantly leached out PAEs into the surrounding water. We found that di-isobutyl phthalate (DiBP) and di-n-butyl phthalate (DnBP) were the main PAEs released from the PE-bags, with the highest values of 83.4 ± 12.5 and 120.1 ± 18.0 ng g–1 of plastic, respectively. Furthermore, dimethyl phthalate (DMP) and diethyl phthalate (DEP) were the main PAEs released from PVC-cables, with mass fractions as high as 9.5 ± 1.4 and 68.9 ± 10.3 ng g–1, respectively. Additionally, we found that light and bacterial exposure increased the total amount of PAEs released from PVC-cables by a factor of up to 5, whereas they had no influence in the case of PE-bags.