期刊
CHEMOSPHERE
卷 224, 期 -, 页码 646-652出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.03.005
关键词
H2O2; Fe(II); Spectrophotometric method; DPD; Determination; Fenton
资金
- National Natural Science Foundation of China [51708231, 51678255]
- China Postdoctoral Science Foundation [2017M612120]
- Natural Science Foundation of Fujian Province [14185013]
- Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University [ZQN-YX506]
A low-cost and environmentally-friendly spectrophotometric method for hydrogen peroxide (H2O2) determination based on the oxidative coloration reaction of N,N'-diethyl-p-phenylenediamine (DPD) via the Fenton reactions in aqueous water was established. The generated pink radical cation (DPD center dot(+)) showed maximum absorption at 551 nm. Importantly, under the optimal conditions (pH 3.0, 20 mM DPD, 1.5 mM Fe(II) and reaction time of 45 s), the increase in absorbance at 551 nm for DPD center dot(+) generation was linear with respect to the addition of H2O2 (0-12 mu M). The sensitivity and the detection limit of the proposed Fenton-DPD method for H2O2 determination at 551 nm were (2.55 +/- 0.01) x 10(4) M-1 cm(-1) and 0.05 mu M, respectively. The stoichiometric factor for the reaction of H2O2 with DPD was 1:1.18. The absorbance of the generated DPD center dot(+) was found to be stable in different types of water within 20 min. Moreover, the proposed Fenton-DPD method could be used for the analysis of the trace H2O2 in rainwater and determine the rate constants that involved H2O2 with high accuracy. (C) 2019 Elsevier Ltd. All rights reserved.
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