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Three acute toxicity studies were available for exposure to n-Pentyl Propionate (CAS # 624 -54 -4). These studies included a 96 -hr fish test with Pimephales promelas that followed standard guidelines and GLP along with a 48 -hr Daphnia magna study and a 72 -hr algal study (Pseudokirchneriella subcapitata) that reported growth inhibiton (ErC50), both studies also following standard guidelines and GLP. The lowest reported acute value was from the algal study with an ErC50 ogf 41.1 mg/L. A toxicity to microorganism study was also available that provided a 16 hr IC50 of 240 mg/L.