The Influence of Plasticisers on Response Characteristics of Anionic Surfactant Potentiometric Sensor | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

4829015

Reference Type

Journal Article

Title

The Influence of Plasticisers on Response Characteristics of Anionic Surfactant Potentiometric Sensor

Author(s)

Karnas, M; Sakac, N; Jozanovic, M; Tsakiri, M; Kopriva, M; Andric, EK; Sak-Bosnar, M

Year

2017

Is Peer Reviewed?

Yes

Journal

International Journal of Electrochemical Science
ISSN: 1452-3981

Publisher

Electrochemical Science Group

Location

BELGRADE

Volume

Issue

Page Numbers

5921-5933

Language

English

DOI

10.20964/2017.07.16

Web of Science Id

WOS:000406090700011

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85023751878&doi=10.20964%2f2017.07.16&partnerID=40&md5=11e6db8250d4f248847c7d9a7870c89f
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Abstract

Six different plasticisers, 2-nitrophenyl octyl ether (P1), bis(2-ethylhexyl) phthalate (P2), bis (2-ethylhexyl) sebacate (P3), 2-nitrophenyl phenyl ether (P4), dibutyl phthalate (P5) and dibutyl sebacate (P6), were incorporated into PVC-based surfactant sensors, and their influence on the determination of anionic surfactants (sodium laurylsulfate (SDS) and sodium dodecylbenzenesulfonate (DBS)) was investigated. Dimethyldioctadecylammonium-tetraphenylborate (DDA-TPB) was used as an ion-pair in the membrane. The sensors containing plasticisers P1-P5 exhibited a sub-Nernstian slope value ranging from -46.4 to -54.8 (mV/decade of activity), while P6 exhibited a super-Nernstian slope value of -66.3 (mV/decade of activity). All the obtained titration curves displayed well defined and sharp inflexion points. Due to the best analytical performance and its low price, the sensor containing dibutyl phthalate (P5) was selected for further investigation. It also provides fast dynamic response and the highest value of potential change at the end-point, allowing reliable end-point location even at low concentration levels of analyte. The linear response renge of the sensor was 6.1 x 10(-3) to 7.2 x 10(-7) M with the sub-Nernstian slope value of -53.1 +/- 0.6 (mV/decade of activity) and the lower detection limit of 3.9 x 10(-7) M. The commonly used compounds in product formulations did not interfere with the measurements. Anionic surfactant content was successfully determined in commercial dishwashing detergents.

Keywords

Plasticiser; surfactants; surfactant sensor; direct potentiometry; potentiometric titration