Analytical Sciences

Synchronous Multi-sits Determination of H₂O₂ in Vertical Water Based on Phosphor TiO₂/SiO₂ Nanocomposite

Yan MENG, Qian ZHAO, Guangqun TAN, Hongyan YUAN, and Dan XIAO

College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China

A promising strategy for trace analysis of hydrogen peroxide (H₂O₂) in natural water was established based on solid substrate room temperature phosphorimetry. The use of TiO₂/SiO₂ composite material as a phosphor for H₂O₂ detection was investigated. TiO₂/SiO₂ nanoparticle material was manufactured into a test kit for synchronous multilevel sampling test in the water sample reservoir. The proposed TiO₂/SiO₂ test kit displayed a wide linear response to H₂O₂ concentrations ranging from 1.0 × 10⁻⁶ to 1.0 × 10⁻¹ M with a detection limit of 4.6 × 10⁻⁷ M. When the concentration of other species was 100 times of 1.0 × 10⁻⁴ M H₂O₂, the proposed test kit exhibited good selectivity toward the coexistence of 20 foreign ions. Satisfactory agreement between the proposed kit and spectrophotometric method was obtained, which demonstrated the possibility of its further development into a promising commercial phosphorescence sensor.

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