Development of an Optode Detector for Determination of Anionic Surfactants by Flow Injection Analysis

Abstract

A flow-injection analysis (FIA) method for assaying an anionic surfactant (AS) using AS optode detector was demonstrated. The optode membrane consists of 2-nitrophenyl octyl ether as a plasticizer, lactone form rhodamine B (L-RB) and poly(vinyl chloride). The linear response concentration range of the AS optode to AS was 20 – 100 μmol dm⁻³ in the FIA system. The sampling rate for an AS ion (40 μmol dm⁻³ sodium dodecylbenzenesulfonate) in the proposed FIA system was ca. 5 samples h⁻¹. The AS level in commercially available laundry detergents by the proposed FIA system was determined.