Measurement of Fluoride Activity and Concentration in Seawater Using a Lanthanum Fluoride Electrode

摘要

Fluoride ion activity is quickly and easily determined in seawater, using a fluoride-selective electrode. Samples require little pretreatment, a determination takes 15 minutes, demands made on the operator are minimal, and the equipment required is rugged, inexpensive, and motion insensitive. The ratio of fluoride activity to total fluoride concentration is given as a function of salinity at constant temperature; where normal ion ratios are encountered, the toatal concentration may be determined using the shipboard method described. The method lends itself to adaptation for in situ analysis. (Author)