An automatic potentiometric analyzer for atmospheric hydrogen fluoride determinations

An automatic potentiometric analyzer for the determination of atmospheric hydrogen fluoride is described. Hydrogen fluoride is collected from the air, which is pumped at 25 l min^-1, in a thin layer of sodium carbonate in a spiral absorber, and measured every hour by washing the absorber with a citrate buffer and measuring the fluoride with a fluoride-selective electrode. The analytically useful range is 0.1–15 μg HF m^-3.