A rapid spectrophotometric determination of persulfate anion in ISCO.

Abstract:

: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 spectrophotometric 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.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Liang C,Huang CF,Mohanty N,Kurakalva RM

doi

10.1016/j.chemosphere.2008.08.043

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

1540-3

issue

9

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(08)01093-X

journal_volume

73

pub_type

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