Distribution in ocean
Fluorine is a major component of seawater and is believed to have a conservative
distribution, although positive
anomalies have been reported in several studies (data).
Speciation
Fluoride is present in seawater as the fluoride anion F-.
Analysis
Fluoride can be determined colorimetrically by the llanthanum-alizarium
complexone method or potentiometrically with a fluoride ion selective electrode
that has been calibrated in seawater media.