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Review

Rapid determination of persulphate in aqueous solutions by visible spectrophotometry

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Pages 662-671 | Received 20 Nov 2021, Accepted 23 Dec 2021, Published online: 07 Jan 2022
 

ABSTRACT

Peroxynitrite-advanced oxidation technology generates strong oxidising and reactive radicals and is considered one of the most effective and attractive methods for degrading toxic organic pollutants, but studies have found that peroxynitrite utilisation during wastewater treatment is low, so it is essential to choose a simple and fast method for measuring the persulphate concentration during and after degradation of organic pollutants in a treatment system to improve their utilisation. This study investigated the spectrophotometric quantification of persulphate (S2O82-) based on the classical iodometric titration method. Instead of a back-titration step, the absorbance of yellow iodide colour was measured at 400 nm (A400) in the presence of a bicarbonate buffer. The resulting A400 calibration graph was linear in the S2O82- concentration range of 0.0–0.1 mM. With dilution, the method could be used for all concentrations typical of field applications. It has been shown that there was no significant error in the measurement results when the solution was close to neutral pH. Measurement of A400 effectively avoided the influence of other interfering ions, such as Cu2+, SO42-, Cl and CO32-. In addition, the method exhibited little dependence on other matrix components and A400 stable (<2% change) for more than one week. Overall, this method was fast and simple and offered a new option for measuring persulphate during the treatment of organic pollutants.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors are grateful to the financial support by the Open Project of the State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (QAK201503), and by the National Key R&D Program of China (2019YFC1407700).

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