School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States.
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States.
Chemosphere. 2020 Oct;257:127229. doi: 10.1016/j.chemosphere.2020.127229. Epub 2020 May 28.
With low potential to generate harmful by-products, peracetic acid (PAA) has drawn increasing attention as an alternative oxidant for disinfection and advanced oxidation processes in wastewater treatment. Commercial formulations contain significant concentrations of both PAA and HO in aqueous solutions and a robust method to distinctively quantify the two respective oxidants simultaneously is needed. This study aimed to improve the accuracy of employing methyl p-tolyl sulfide (MTS) and triphenylphosphine (TPP) as indicators for PAA and HO, respectively, under various environmental conditions, by the detection of the oxidation products of sulfoxide MTSO and phosphine oxide TPPO using HPLC-UV. To improve the analytical method, the reaction rates of MTS and TPP with PAA and HO, impact of pH on the detection, and matrix effects of real wastewater effluents and produce wash water were evaluated to minimize the interference of HO with PAA determination. The determined rate constants of PAA reaction with MTS (k=34.6±0.4Ms in 2/1 HO/acetonitrile (ACN) (v/v)) and HO reaction with TPP ( [Formula: see text] in 1/1 HO/ACN (v/v)) provided the fundamental guidance to optimize the method. Overall, a highly accurate and sensitive method for simultaneous quantification of PAA and HO (method quantification limit = 0.8 and 6.0 μM, respectively) is established and will be useful for various environmental samples with PAA and HO applications.
过氧乙酸（PAA）生成有害副产物的潜力较低，作为替代氧化剂，在废水处理中用于消毒和高级氧化过程，受到越来越多的关注。商业制剂在水溶液中含有大量的 PAA 和 HO，因此需要一种强大的方法来同时区分这两种氧化剂。本研究旨在通过 HPLC-UV 检测亚砜 MTSO 和氧化膦 TPPO 的氧化产物，提高在各种环境条件下分别使用甲基对甲苯磺酸（MTS）和三苯基膦（TPP）作为 PAA 和 HO 指示剂的准确性。为了改进分析方法，评估了 MTS 和 TPP 与 PAA 和 HO 的反应速率、pH 值对检测的影响以及实际废水和生产冲洗水的基质效应，以最大程度地减少 HO 对 PAA 测定的干扰。确定了 MTS 与 PAA 的反应速率常数（k=34.6±0.4Ms，在 2/1 HO/乙腈（ACN）（v/v）中）和 TPP 与 HO 的反应速率常数（[Formula: see text]，在 1/1 HO/ACN（v/v）中），为优化方法提供了基本指导。总之，建立了一种同时定量测定 PAA 和 HO 的高度准确和灵敏的方法（方法定量限分别为 0.8 和 6.0 μM），将有助于各种含有 PAA 和 HO 应用的环境样品的分析。
