A rapid spectrophotometric determination of persulfate anion in ISCO
A rapid spectrophotometric determination of persulfate anion in ISCO
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DOI：
10.1016/j.chemosphere.2008.08.043
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发表时间：
2008-11-01
期刊：
影响因子：
8.8
通讯作者：
Kurakalva, Rama Mohan
中科院分区：
文献类型：
--
作者：
Liang, Chenju;Huang, Chiu-Fen;Kurakalva, Rama Mohan
由于过硫酸盐作为原位化学氧化 (ISCO) 氧化剂的使用逐渐增加，因此需要对过硫酸盐浓度进行简单测量，以分析现场内外指定时间间隔的过硫酸盐分布。这样的分布有助于评估现场 ISCO 治疗的效果。这项工作提出了一种基于碘滴定法改进的分光光度法测定过硫酸盐。对过硫酸盐和碘化物在碳酸氢钠存在下反应产生的黄色溶液的吸收光谱进行分析，显示在 352 nm 处有吸光度，而没有受到试剂基质的明显干扰。校准图在 352 nm 处过硫酸盐溶液浓度 0-70 mM 范围内呈线性。该方法通过碘量滴定法进行了验证。溶液pH值接近中性并且铁活化剂的存在不会干扰吸收测量。此外，使用所提出的方法对地下水样品中的过硫酸盐进行的分析表明与滴定方法的测量结果非常一致。这种过硫酸盐的分光光度定量法为评估修复现场的 ISCO 有效性提供了一种简单而快速的方法。 (C) 2008 Elsevier Ltd. 保留所有权利。
Due to a gradual increase in the use of persulfate as an in situ chemical oxidation (ISCO) oxidant, a simple measurement of persulfate concentration is desirable to analyze persulfate distribution at designated time intervals on/off a site. Such a distribution helps evaluate efficacy of ISCO treatment at a site. This work proposes a spectro photo metric determination of persulfate based on modification of the iodometric titration method. The analysis of absorption spectra of a yellow color solution resulting from the reaction of persulfate and iodide in the presence of sodium bicarbonate reveals an absorbance at 352 nm, without significant interferences from the reagent matrix. The calibration graph was linear in the range of persulfate solution concentration of 0-70 mM at 352 nm. The proposed method is validated by the iodometric titration method. The solution pH was at near neutral and the presence of iron activator does not interfere with the absorption measurement. Also, analysis of persulfate in a groundwater sample using the proposed method indicates a good agreement with measurements by the titration method. This proposed spectrophotometric quantification of persulfate provides a simple and rapid method for evaluation of ISCO effectiveness at a remediation site. (C) 2008 Elsevier Ltd. All rights reserved.