“…However, some of these materials, including tire rubbers, contain from 40 to 60% synthetic polymers (i.e., styrene-butadiene and polybutadiene rubbers) and are characterized by physical proprieties such as solid state and insolubility in water; therefore, some agencies and environmental researchers classify them among plastics [ 3 , 4 , 5 , 6 ]. Tires, in addition to synthetic polymers, contain silica, oil, carbon black, sulfur compounds and zinc oxide [ 7 ]. Zinc (Zn) represents 1–2% of the total weight of tires, and the leaching of this element in water represents an important environmental concern [ 8 ].…”