Multi-wavelength spectrophotometric measurement of persulfates using 2,2 '-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) as indicator
Multi-wavelength spectrophotometric measurement of persulfates using 2,2 '-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) as indicator
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使用 2,2'-连氮基双(3-乙基苯并噻唑啉-6-磺酸盐) (ABTS) 作为指示剂的多波长分光光度法测量过硫酸盐
DOI：
10.1016/j.saa.2019.03.019
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Yuan Baoling
中科院分区：
文献类型：
--
作者：
Zou Jing;Huang Yixin;Zhu Lirong;Cui Zheng;Yuan Baoling
提出了以2，2 ′-连氮基-双（3-乙基苯并噻唑啉-6-磺酸盐）（ABTS）为指示剂测定过硫酸盐的分光光度法，过一硫酸盐（PMS）和过二硫酸盐（PDS）。该方法基于在中性pH和室温下，PMS/PDS直接氧化无色ABTS以生成绿色ABTS自由基dot+。生成的ABTS自由基dot+在820 nm、732 nm、650 nm和415 nm处有4个不同的特征吸收峰。在3-500 μM范围内，PMS/PDS的浓度与相应波长的吸光度值呈良好的线性关系（R2> 0.998）。ABTS法监测PMS/PDS浓度变化与碘化钾指示剂分光光度法监测结果一致。采用ABTS方法对PMS/PDS进行分析后产生的绿色废液对大肠杆菌没有杀菌作用。以ABTS为指示剂的多波长分光光度法可作为一种简便、准确测定水中PMS/PDS的候选方法。
A spectrophotometric method using 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) as the indicator was proposed for measuring persulfates, i.e., peroxymonosulfate (PMS) and peroxydisulfate (PDS). This method was based on the direct oxidation of the colorless ABTS by PMS/PDS to generate the green-colored ABTSradical dot+at neutral pH and room temperature. The generated ABTSradical dot+had four different characteristic absorption peaks at 820 nm, 732 nm, 650 nm and 415 nm. The absorption values at these wavelengths increased with the increase of PMS/PDS concentration, and there were well linear relationships (R2> 0.998) between the corresponding absorption values and the concentrations of PMS/PDS in the range of 3–500 μM. Monitoring the change of PMS/PDS concentration by the proposed ABTS method was in good agreement with that monitored by the common spectrophotometric method using potassium iodide as the indicator. The green-colored waste solutions produced after PMS/PDS analysis with the ABTS method showed no bactericidal effect towardsEscherichia coli. The proposed multi-wavelength spectrophotometric method using ABTS as the indicator could be employed as a candidate method for the accurate and convenient measurement of PMS/PDS in water.