Pulsating potentiometric titration technique for assay of dissolved oxygen in water at trace level

P. Sahoo, R. Ananthanarayanan, N. Malathi, M.P. Rajiniganth, N. Murali, P. Swaminathan

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A simple but high performance potentiometric titration technique using pulsating sensors has been developed for assay of dissolved oxygen (DO) in water samples down to 10.0μgL-1 levels. The technique involves Winkler titration chemistry, commonly used for determination of dissolved oxygen in water at mgL-1 levels, with modification in methodology for accurate detection of end point even at 10.0μgL-1 levels DO present in the sample. An indigenously built sampling cum pretreatment vessel has been deployed for collection and chemical fixing of dissolved oxygen in water samples from flowing water line without exposure to air. A potentiometric titration facility using pulsating sensors developed in-house is used to carry out titration. The power of the titration technique has been realised in estimation of very dilute solution of iodine equivalent to 10μgL-1 O2. Finally, several water samples containing dissolved oxygen from mgL-1 to μgL-1 levels were successfully analysed with excellent reproducibility using this new technique. The precision in measurement of DO in water at 10μgL-1 O2 level is 0.14 (n=5), RSD: 1.4%. Probably for the first time a potentiometric titration technique has been successfully deployed for assay of dissolved oxygen in water samples at 10μgL-1 levels. © 2010 Elsevier B.V.
Original languageEnglish
Pages (from-to)17-24
Number of pages8
JournalAnalytica Chimica Acta
Volume669
Issue number1-2
DOIs
Publication statusPublished - 2010

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Dissolved oxygen
Titration
Assays
dissolved oxygen
assay
Oxygen
Water
water
Water piping systems
sensor
Sensors
iodine
Iodine
shoreline
vessel
Air
Sampling
methodology
sampling
air

Cite this

Sahoo, P., Ananthanarayanan, R., Malathi, N., Rajiniganth, M. P., Murali, N., & Swaminathan, P. (2010). Pulsating potentiometric titration technique for assay of dissolved oxygen in water at trace level. Analytica Chimica Acta, 669(1-2), 17-24. https://doi.org/10.1016/j.aca.2010.04.040
Sahoo, P. ; Ananthanarayanan, R. ; Malathi, N. ; Rajiniganth, M.P. ; Murali, N. ; Swaminathan, P. / Pulsating potentiometric titration technique for assay of dissolved oxygen in water at trace level. In: Analytica Chimica Acta. 2010 ; Vol. 669, No. 1-2. pp. 17-24.
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Sahoo, P, Ananthanarayanan, R, Malathi, N, Rajiniganth, MP, Murali, N & Swaminathan, P 2010, 'Pulsating potentiometric titration technique for assay of dissolved oxygen in water at trace level', Analytica Chimica Acta, vol. 669, no. 1-2, pp. 17-24. https://doi.org/10.1016/j.aca.2010.04.040

Pulsating potentiometric titration technique for assay of dissolved oxygen in water at trace level. / Sahoo, P.; Ananthanarayanan, R.; Malathi, N.; Rajiniganth, M.P.; Murali, N.; Swaminathan, P.

In: Analytica Chimica Acta, Vol. 669, No. 1-2, 2010, p. 17-24.

Research output: Contribution to journalArticle

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AU - Ananthanarayanan, R.

AU - Malathi, N.

AU - Rajiniganth, M.P.

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