The Chemical Composition of the Rain Water in Utsunomiya during 1937 and 1938

[摘要] The results are as follows:1. The concentrations of nitrite, nitrate and sulphate increase in winter and decrease in summer; on the contrary, there was no remarkable annual variation in pH and ammonia.2. There are found no distinct relations of the wind direction and the path of cyclone to the chemical composition of rain water.3. The chloride content increases with the wind velocity, but on the other hand, other components show their maximum of concentration at the wind velocity of 2-5m/s.4. The rate of pollution decreasses with the amount of rainfall except the rate of chloride, which was almost independent of the latter.5. The mean value of nitrite content of the rain accompanied by thunder was about twice as much as that of the ordinary rain.

[学科分类] 大气科学