清除
校准
化学
稳健性(进化)
羟基自由基
异丙醇
生物系统
工艺工程
环境科学
激进的
有机化学
数学
统计
工程类
基因
生物
生物化学
抗氧化剂
作者
Chengjin Wang,Erik J. Rosenfeldt,L. Yi,Ron Hofmann
标识
DOI:10.1021/acs.est.9b06273
摘要
The hydroxyl radical (•OH) scavenging capacity is a useful parameter for the design and operation of an advanced oxidation process (AOP) in water treatment. The scavenging capacity may change with time, and it would be useful to continuously measure this change to be able to optimize AOP doses. In this study, we first reviewed current methods for scavenging capacity measurement to identify strengths and weaknesses of each method. This information helped guide the design of an external calibration method to allow straightforward laboratory and field measurement of •OH scavenging capacity. The method used low-pressure UV/H2O2 as the •OH generation system, methylene blue (MB) as the probe compound, and isopropyl alcohol (IPA) as the standard. By monitoring, offline, the color decay of MB in a series of IPA solutions with different scavenging capacity, a calibration curve was established between the color decay rate and the scavenging capacity. The measured color decay in real water samples can then be used with this external calibration to estimate their scavenging capacity. Work was undertaken to ensure that the process would be robust under a wide range of water quality conditions. Parallel tests using this method compared with the benchmark methods confirmed its robustness and accuracy.
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