Application of a pulse-discharge helium detector to the determination of neon in air and water

A pulse-discharge helium detector (Valco, PD-D2-I) is used to measure neon concentrations in air and water. The detection level is 0.5×10−8 g/cm3 (0.2 ppm). Discharge gas doped with neon results in a linear response to the neon mass up to 10−6 g. For measuring the neon concentration in water, a simple enrichment system is used.