CHEN Zhiqin¹, JIANG Jiali¹, ZOU Yuchun¹, LUO Shanshan², AI Jianping¹, LI Wenkui¹

(1. College of Materials and Mechanical & Electrical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, Jiangxi, China; 2. School of Pharmacy, Jiangxi Science and Technology Normal University, Nanchang 330013, Jiangxi, China)

Abstract: Nanometer TiO₂ and ZnO have been synthesized using TiCl₄ and Zn(NO₃)₂·6H₂O as starting precursors by hydrothermal crystallization method, respectively. Toxicological effect of nanometer TiO₂ and ZnO were investigated on chlorella vulgaris cultivated in modified Blue–Green medium (BG-11). With different concentrations (0 mg/L, 10 mg/L, 20 mg/L, 50 mg/L, 100 mg/L) of TiO₂ and ZnO, respectively, the chlorella species were exposed for 96 h with a daily reading of the quantity of chlorella cultivated in modified BG-11 medium. Results showed that the inhibition effect of nano TiO₂ was enhanced as the titan ion concentration increased at the initial 48 h exposing stage, while weakened as the time stretched. For nano ZnO, its inhibition effect was strongly enhanced as the zinc ion concentration increased, and when the zincion concentration was higher than 50 mg/L, the chlorella growth was arrested.
Key words: toxicological effects; chlorella; TiO₂; ZnO