A 0.5nm molecular sieve absorption column and a hot decomposing magnesium bed was found to be one of the effective means to collect and decompose HTO in glove box atmosphere. The absorption characteristics of the 0.5nm molecular sieve column and water decomposing characteristics of the hot Mg bed were obtained. The results showed that the column absorbs water vapour from air with efficiency up to 99.99%. Water in tested gases was between 3.4×10 3 to 4.2×10 3 μg·g -1 and the total water absorbed on the column was up to 162g

under this condition no water was detected in output gases. Using the hot magnesium bed more than 99.9% desorption water from the column was decomposed.