Le acque di laghi e fiumi svizzeri sono inquinate dalle cosiddette microplastiche, frammenti di dimensioni comprese fra 0,3 e 5 millimetri. Il Politecnico di Losanna ne ha rinvenuti nella maggior parte dei campioni raccolti in sei bacini, fra i quali il Verbano, oltre in un tratto ginevrino del fiume Rodano.
Questi inquinanti, eliminati grazie ai filtri utilizzati per rendere potabile l'acqua, non costituiscono un rischio per la salute dell'uomo, ma il loro impatto sull'ambiente è difficile da determinare.
Lo studio, voluto dall'Ufficio federale dell'ambiente, colma una lacuna: mentre la questione della plastica nei mari è stata oggetto di numerose ricerche (la quantità è stimata a 269'000 tonnellate), per le acque interne è quasi ignota.
pon/ATS
Dal TG20:
12.12.2014: Microparticelle nelle acque svizzere
RSI Telegiornale 12.12.2014, 20:49
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