The formation of hydrated electrons in neutral aqueous ultrasound-exposed solutions has been postulated previously, and several arguments were presented in favor and against their existence. In this work we use a sensitive method for detecting the presence of hydrated electrons in argon-saturated water exposed to 50 kHz ultrasound. This method is based on the fact that hydrated electrons, but not hydrogen atoms, can be scavenged by Cd2+ to prevent their reaction with the nitrone spin trap alpha-(4-pyridyl-1-oxide)-N-tert-butylnitrone (POBN) to form the EPR-detectable adduct POBN/H-.. No detectable yield of hydrated electrons in argon-saturated aqueous solutions at neutral pH was found. These results are evidence against the formation of hydrated electrons as reactive intermediates in the sonochemistry of neutral aqueous solutions.