To investigate the accuracy of the method, the samples were run in a random fashion. The hydrogen content of a lot of uranium tetrafluoride was established by averaging the results of 10 determinations (sample 4, Table II). Another sample of the same lot was spiked with 33.0 p.p.m. hydrogen in the form of barium chloride dihydrate, and 10 more determinations were run (sample 5, Table II). The difference between the averages of the amount of hydrogen found and the residual is 35.4 p.p.m. At the 95% confidence level this value is not significantly different from 33.0, the theoretical value of the spike. Consequently, the method is considered accurate.The method was used to determine water in refractory magnesium fluoride (Table III). In the range studied the average relative precision is ± 16% at the 95% confidence level. Because a 10-gram sample was the largest that Table 111. Hydrogen Present as Water and/or Hydrogen Fluoride
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