Effect of TEA on urinary Na⁺ and K⁺ excretion in the rat. (A) Calibration of TEA-sensing electrodes. Electrodes were filled with 100 mM KCl. The test solution contained 100 mM KCl + 1–30 mM TEA•Cl. The regression line represents V = 130•log(TEA) + 73. (B) Na and K excretion during the first hour after administration of TEA (30 μmol/100 g body weight) or vehicle. Data represent mean ± SEM for six to seven measurements in rats under control conditions, with dietary K loading for 7 d, or after administration of furosemide (6 mg/kg body weight).