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La contaminazione al mercurio vicino al comune di Visp, in Vallese, è più estesa di quanto si pensasse. Delle indagini hanno permesso di trovare un’ulteriore zona abitata inquinata. La ditta chimica responsabile della contaminazione, Lonza, ha annunciato martedì che nuovi studi verranno effettuati.
L’area in questione si trova a sud della stazione del paese e il suo terreno presenta concentrazioni del metallo pesante anche al di sopra dei 75 mg/kg, superando, e di molto, il valore massimo ammesso di 5 mg/kg.
L’uso delle parcelle di terreno come giardini privati e parchi da gioco è stata proibita dal Servizio della protezione ambientale del cantone fino a quando la zona non sarà bonificata.
Lonza, tra il 1930 e il 1970, ha versato nel canale Grossgrund i suoi scarti industriali. Circa 4,5 tonnellate di mercurio hanno contaminato la regione.
ats/ZZ
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