Synchronous multi-sits determination of H 2 O 2 in vertical water based on phosphor TiO 2 /SiO 2 nanocomposite

Abstract

A promising strategy for trace analysis of hydrogen peroxide (H 2 O 2 ) in natural water was established based on solid substrate room temperature phosphorimetry. The use of TiO 2 /SiO 2 composite material as a phosphor for H 2 O 2 detection was investigated. TiO 2 /SiO 2 nanoparticle material was manufactured into a test kit for synchronous multilevel sampling test in the water sample reservoir. The proposed TiO 2 /SiO 2 test kit displayed a wide linear response to H 2 O 2 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 H 2 O 2 , 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.