Patent ID: 7462836
Filing Date: 2008-12-09
Classification: G01T

Abstract:
1. A method for separating and measuring 37 Ar from a soil gas sample or an atmospheric sample, which comprises the following steps in turn: 1) sampling, which comprises collecting soil gas sample or directly collecting atmospheric air with a syringe sampler; 2) eliminating impurities, which comprises passing the gas sample as collected through a room temperature molecular sieve column to eliminate H 3) separating, which comprises allowing the gas sample after eliminating impurities to be adsorbed by entering a sampling column positioned in a cold trap at a temperature from −170° C. to −185° C., and then washing the sampling column with a He gas stream, whereby a majority of Ar and partial O 4) purifying, which comprises taking the collection column out of the cold trap, and washing it with a He carrier gas stream after heating, whereby Ar, O 5) measuring the sum of Ar, which comprises measuring the sum of Ar as collected with the thermal conductivity detector; 6) collecting Ar, which comprises collecting Ar in tail gas out of the thermal conductivity detector with an activated carbon collection column positioned in a liquid nitrogen cold trap heating the activated carbon collection column, and collecting Ar gas as desorbed with a proportional counter; and 7) measuring the activity of