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5097234 
Technical Report 
Effects of carbon dioxide, nitrogen, air and nitrogen salts on spray solution pH 
Mccormick, RW 
1990 
4 
4 
910-912 
English 
BIOSIS COPYRIGHT: BIOL ABS. Water samples from eight locations, ranging in pH from 7.1 to 8.5, were tested to determine the effect of carbon dioxide (CO2) pressurization on pH. After pressurization with CO2 the pH of the water decreased 1.8 to 4.1 pH units. An increase of 0.4 to 1.2 pH units occurred after the CO2 pressurized water exited a spray nozzle. The use of N2 or air as a pressurizing gas had very little effect on pH. The addition of diammonium phosphate, urea-ammonium nitrate (UAN), or ammonium sulfate had only minor effects on water pH. The addition of monoammonium phosphate reduced water pH to 4.6 to 5.5. The physical/chemical properties and activity of a herbicide may be altered with the change in spray solution pH by using CO2 to pressurize the spray solution.