SOLUBLE FLUORIDE-ION CONCENTRATION AND DE POSITION IN ATMOSPHERIC DEPOSIT IN NIIGATA PREFECTURE

Soluble fluoride ion in atmospheric deposits collected from Niigata Pr efecture, located along the coast of the Sea of Japan, were determined . Soluble fluoride ion was a miner component in the atmospheric deposi ts. In the long term sampling stations, the averaged non-seasalt fluor ide ion (nssF(-)) concentration ranged from 0.56 to 0.63 mu eq . l(-1) , while nssF(-) deposition flux ranged from 2.43 to 3.91 mu eq . m(-2) . d(-1). Seasonal variation of nssF(-) concentrations and deposition f luxes showed a tendency similar to that of non-seasalt sulfate, which was higher in winter and lower in summer.