ire ▁rub ber ▁le ach ates ▁do ▁contain ▁certain ▁min er als ▁and ▁comp ounds ▁which ▁may ▁be ▁ec ot ox ic ▁in ▁high ▁concentr ations . ▁Rec yc led ▁t ire ▁mul ch ▁can ▁contain ▁trace ▁amounts ▁of ▁various ▁min er als ▁from ▁the ▁t ire ▁manufact uring ▁process ▁and ▁other ▁chemical s ▁that ▁may ▁have ▁been ▁picked ▁up ▁during ▁the ▁t ire ' s ▁service ▁life . ▁The ▁greater ▁the ▁surface ▁area ▁of ▁synth etic ▁rub ber ▁waste ▁pel lets , ▁the ▁greater ▁the ▁potential ▁for ▁break down ▁into ▁harm ful ▁constitu ents . ▁For ▁le ached ▁t ire ▁de br is , ▁the ▁( pot ential ) ▁environmental ▁impact ▁of ▁the ▁ing red ients ▁z inc ▁and ▁organ ic ▁to xic ants ▁has ▁been ▁demonstrated . ▁ ▁See ▁also ▁Mul ch ▁Rub ber ▁Ret reading ▁T ire ▁Rec y cling ▁Green ▁Building ▁Pl astic ▁mul ch ▁ ▁References ▁ ▁External ▁links ▁ ▁New ▁York ▁artificial ▁tur f ▁field ▁study ▁The ▁M yth ▁of ▁Rub ber ized ▁Land sc apes ▁Art ific ial ▁Tur f : ▁Ex pos ures ▁to ▁Gr ound ▁Up ▁Rub ber ▁T ires ▁- ▁Athlet ic ▁Field s , ▁Play ground s , ▁Garden ▁Mul ch ▁ ▁Category : S ust ain able ▁garden ing ▁Category : Rec yc led ▁building ▁materials ▁Category : S ust ain able ▁products ▁Category : S ust ain able ▁building ▁Category : So il ▁impro vers ▁Category : W ater ▁conservation ▁Category : P av ements ▁Category : T ires <0x0A>