摘要
文章开发建立了一种快速、简便、准确测定水中过氧乙酸浓度的分光光度方法.该方法基于催化氧化脱色原理,利用Co(Ⅱ)选择性催化过氧乙酸氧化脱色酸性橙7.研究结果表明,酸性橙7脱色程度随过氧乙酸浓度的提高而增加,且酸性橙7在其特征吸收波长484 nm处的吸光度变化值与过氧乙酸浓度具有良好的线性关系.该方法的检测时间仅为1 min、最低检测限为0.48μmol·L^(-1)且线性范围为0—60μmol·L^(-1).共存的过氧化氢以及实际水体水质背景中存在的硫酸根离子、氯离子、碳酸氢根离子、硝酸根离子、腐殖酸和三价铁离子对该方法的测定结果均没有显著影响.该方法还成功运用于监测过氧乙酸活化体系降解双氯芬酸过程中过氧乙酸的浓度变化.
This work developed a rapid,simple and accurate spectrophotometric method for determining the concentration of peracetic acid.The developed method was based on the oxidation decolorization of acidic orange 7 by PAA using Co(Ⅱ)as the catalyst.The results showed that the decolorization degree of acidic orange 7 increased with the concentration of peracetic acid,and there was a well linear relationship between the concentration of peracetic acid below 60μmol·L^(-1) and the absorbance change at 484 nm(the characteristic absorption wavelength of acidic orange 7).Determination time of the AO7 method was as short as 1 minute and limit of detection was calculated as low as 0.48μmol·L^(-1).The determination of peracetic acid with the AO7 method were not affected by the coexistent hydrogen peroxide and the substances in actual water samples including sulfate ion,chloride ion,bicarbonate ion,nitrate ion,humic acid,and ferric iron ion.The developed AO7 method was successfully used to monitor the variation of peracetic acid concentration during the degradation of diclofenac in Co(Ⅱ)/PAA and Fe(Ⅱ)/PAA processes.
作者
许冬梅
陈思颖
董冬吟
杨仕毅
陈铃心
林晓峰
崔航宇
邹景
XU Dongmei;CHEN Siying;DONG Dongyin;YANG Shiyi;CHEN Lingxin;LIN Xiaofeng;CUI Hangyu;ZOU Jing(Fujian Province,Quanzhou Environmental Monitoring Center Station,Quanzhou,362000,China;Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control,College of Civil Engineering,Huaqiao University,Xiamen,361021,China;Hebei Water Conservancy Planning and Design and Research Institute Co.,Ltd,Shijiazhuang,050021,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第9期3165-3173,共9页
Environmental Chemistry
基金
福建省泉州市科技计划项目(2022NS010)
国家级大学生创新创业训练计划项目(202310385045)资助.
关键词
过氧乙酸
测定方法
过氧化氢
酸性橙7
二价钴
peracetic acid
determination method
hydrogen peroxide
acid orange 7
Co(Ⅱ)
