Determination of fluoride in toothpaste, effluent streams and natural and borehole water using a flow injection system with a fluoride-selective membrane electrode

Abstract

An automated system for the determination of fluoride in toothpaste, effluent streams, natural and borehole water based on the concept of flow injection with a fluoride-selective membrane electrode as sensor is described. The system is suitable for the on-line monitoring of fluoride at a sampling rate of 60 samples h⁻¹ in the linear range 10⁻⁴–10⁻¹ (approximately 1.9–1900 mg l⁻¹) with an RSD of better than 0.6%.