IN-SITU REAL-TIME SEQUENTIAL POTENTIOMETRIC DETERMINATIONS OF POTASSIUM CONCENTRATIONS FROM 3 COCHLEAR REGIONS IN NOISE-EXPOSED RATS

Double-barrelled potassium selective microelectrodes (K-ISME) were use d in situ for real-time sequential determinations of potassium concent rations (C-K+) in endolymph, marginal cells and the spiral ligaments o f rats exposed to moderate noise at 100 dB for 30 min (NE) and control (CTL) animals, C-K+ in NE animals at these sites did not differ signi ficantly when compared to C-K+ in CTL animals. However, there was a sl ight decrease in C-K+ in marginal cells in the noise-exposed animals.