Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China.
Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Jun 5;216:214-220. doi: 10.1016/j.saa.2019.03.019. Epub 2019 Mar 14.
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 ABTS at neutral pH and room temperature. The generated ABTS 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 (R > 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 towards Escherichia 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.
提出了一种使用 2,2'-偶氮双（3-乙基苯并噻唑啉-6-磺酸）（ABTS）作为指示剂的分光光度法来测量过硫酸盐，即过一硫酸盐（PMS）和过二硫酸盐（PDS）。该方法基于在中性 pH 值和室温下，无色 ABTS 被 PMS/PDS 直接氧化生成绿色 ABTS。生成的 ABTS 在 820nm、732nm、650nm 和 415nm 处有四个不同的特征吸收峰。在这些波长处的吸光度随 PMS/PDS 浓度的增加而增加，并且在 3-500µM 范围内，相应的吸光度与 PMS/PDS 浓度之间存在良好的线性关系（R>0.998）。通过所提出的 ABTS 方法监测 PMS/PDS 浓度的变化与使用碘化钾作为指示剂的常用分光光度法监测的结果非常吻合。用 ABTS 法分析 PMS/PDS 后产生的绿色废溶液对大肠杆菌没有杀菌作用。该方法采用 ABTS 作为指示剂的多波长分光光度法可作为一种准确、方便地测量水中 PMS/PDS 的候选方法。
