Abstract

The electronic tongue concept based on layer-by-layer (LbL) films can be used to the detection in water of triclosan (TCS), a pernicious molecule used in personal care products and widely released in the environment. In this work, we analyzed the adsorption of TCS on poly(allylaminehydrochloride) (PAH) and poly[1-[4-(3-carboxy-4hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) layers of PAH/PAZO LbL films. We demonstrate that the adsorbed amount is strongly dependent of pH, the efficiency of adsorption of TCS on PAH layer is higher, and, when PAZO is the outmost layer, the electrical parameters can discriminate the ionic strength on solutions of TCS.

Highlights

  • Water is an essential and indispensable good to human health and nature’s wellbeing, and it is of the utmost importance to preserve and maintain its quality and cleanliness

  • At the lowest pH of 2.30, the (PAH/PAZO)10 presents a slight increment of absorbances

  • This study allowed to conclude that TCS adsorbs on both (PAH/PAZO)10 and (PAH/PAZO)10/

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Summary

Introduction

Water is an essential and indispensable good to human health and nature’s wellbeing, and it is of the utmost importance to preserve and maintain its quality and cleanliness. Related to the non-regulation of this compound, there is a growing concern about the presence and impact of PPCPs, as well as the need for reliable and effective water monitoring using sensors capable of detecting the target molecules in complex media [6]. One of the main challenges in sensors’ monitoring is the ensure analyte effective detection in environmental complex matrices that contain countless spurious molecules (potential interfering compounds), as well as microscopic life. These molecules, such as salts or even fluctuations of pH can jeopardize the analysis of a target molecule. LbL films of poly(allylamine hydrochloride) (PAH) and poly[1-[4-(3-carboxy4hydroxyphenylazo) benzene sulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) (PAH/PAZO) were prepared onto quartz supports or gold interdigitated electrode deposited on glass (DropSens) by Proceedings 2019, 15, 25; doi:10.3390/proceedings2019015025 www.mdpi.com/journal/proceedings

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