Mineral colloids and nanoparticles in municipal solid waste incinerator bottom ashes and sunscreens leachates

Abstract : This study present “real-world” potential emission of colloidal and soluble concentrations of elements from two potential sources of nanoparticles in the environment, ten representative municipal incinerator bottom ashes gathered by a professional union, and ten commercial sunscreens. The samples are leached and filtered by cascade front-filtration strirred membrane system at 0.45 μM and 3 kDa. The elements are analysed by ICP and the colloidal or nanoparticulate fraction is calculated as the difference between the 0.45 μm fraction and the 3 kDa fraction. For BA, the only elements with a colloidal concentration greater than 1 mg/kg are Ca (9 samples/10), K (4/10), Na (9/10) and Al (6/10). The other elements have lower colloidal concentrations, and for 13 elements, no colloidal fraction. For sunscreens (manufactured with nanoparticles of titanium oxide formulated with Si, Zn and/organic coatings), titanium colloidal concentrations are measured in two leachates out of ten, at low concentrations (50 mg/kg and 9 mg/kg). The same applies to silicon (17 and 23 mg/kg). The other elements of the sunscreens leachates are either low emitted and have no impact on the environment (Na, K, P) or are emitted at very low concentrations (other elements, heavy metals). The absence of the elements or the low concentrations observed in both case suggests that (i) the elements are in leachates in the form of aggregates larger than 450 nm, or (ii) homo- (sunscreen) or heteroaggregation (MSWI-BA) actively reduces the free NP or colloidal concentrations, and hence the potential of emission of elements in a colloidal or nanoparticular form when these materials are used in contact with the environment.
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Pierre Hennebert, Patricia Merdy. Mineral colloids and nanoparticles in municipal solid waste incinerator bottom ashes and sunscreens leachates. 16. International Waste Management and Landfill Symposium (Sardinia 2017), Oct 2017, Cagliari, Italy. ⟨ineris-01863253⟩

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