is added to the sample. The MO test is also suitable for the determination of total halogen, in the presence of bromide ion, It can be concluded also, from studies of the reaction of chlorine with solutions containing bromide ion and ammonia that, to form bromamines in a water supply by addition of chlorine and bromide ion, these would have to be added to a small volume of the water at low pH to form free bromine, and subsequently this solution would have to be mixed with the remainder of the water to be treated.
Acknowledgment
Data from field studies have shown that the ozone concentrations in a complex environment do not exhibit the same mean values at mountaintop and valley sites. The occurrences of the maximum value for the two types of sites are approximately 180° out of phase, the mountaintop maximum occurring at night. Their relative concentrations often vary by a factor of 3 or 4. Ground‐level NO2 concentrations were comparable to reported values. The NO/NO2 ratio was approximately 0.65.
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