Cobalt phthalocyanine as a novel molecular recognition reagent for batch and flow injection potentiometric and spectrophotometric determination of anionic surfactants

Show simple item record

contributor.author El-Nemma, Eman M. en_US
contributor.author Badawi, Nahla M. en_US
contributor.author Hassan, Saad S. M. en_US
date.accessioned 2009-12-27T09:09:20Z en_US
date.available 2009-12-27T09:09:20Z en_US
date.issued 2008-12-12 en_US
identifier.citation El-Nemma, E. M., Badawi, N. M., & Hassan, S. S. M. (2009). Cobalt phthalocyanine as a novel molecular recognition reagent for batch and flow injection potentiometric and spectrophotometric determination of anionic surfactants. Talanta, 78(3), 723–729 en_US
identifier.uri http://dx.doi.org/10.1016/j.talanta.2008.12.029 en_US
identifier.uri http://hdl.handle.net/10576/10480 en_US
description.abstract Cobalt(II) phthalocyanine [Co(II)Pc] is used as both an ionophore and chromogen for batch and flow injection potentiometric and spectrophotometric determination of anionic surfactants (SDS), respectively. The potentiometric technique involves preparation of a polymeric membrane sensor by dispersing [Co(II)Pc] in a plasticized PVC membrane. Under batch mode of operation, the sensor displays a near-Nernstian slope of −56.5 mV decade−1, wide response linear range of 7.8 × 10−4 to 8.0 × 10−7 mol L−1, lower detection limit of 2.5 × 10−7 mol L−1 and exhibits high selectivity for anionic surfactants in the presence of many common ions. Under hydrodynamic mode of operation (FIA), the slope of the calibration plot, limit of detection, and working linear range are −51.1 mV decade−1, 5.6 × 10−7 and 1.0 × 10−3 to 1.0 × 10−6 mol L−1, respectively. The spectrophotometric method is based on the use of [Co(II)Pc] solution in dimethylsulfoxide (DMSO) as a chromogenic reagent. The maximum absorption of the reagent at 658 nm linearly decreases with the increase of anionic surfactant over the concentration range 2–30 μg mL−1. The lower limit of detection is 1 μg mL−1 and high concentrations of many interfering ions are tolerated. Flow injection spectrophotometric measurements are carried out by injection of the surfactant test solution in a stream of the reagent in DMSO. The sample throughput, working range and lower detection limit are 25–30 samples h−1, 4–60 and 2 μg mL−1, respectively. The potentiometric and spectrophotometric techniques are applied to the batch and flow injection measurements of anionic surfactants in some commercial detergent products. The results agree fairly well with data obtained using the standard methylene blue spectrophotometric method. en_US
language.iso en en_US
publisher Elsevier B. V. en_US
subject Potentiometry en_US
subject Spectrophotometry en_US
subject Anionic surfactants en_US
subject Sensors en_US
subject Chromogen en_US
subject Molecular recognition en_US
subject Flow injection analysis en_US
subject Cobalt(II)phthalocyanine en_US
title Cobalt phthalocyanine as a novel molecular recognition reagent for batch and flow injection potentiometric and spectrophotometric determination of anionic surfactants en_US
type Article en_US


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record