FIELD: analytical methods. SUBSTANCE: method involving modifying resonator electrodes by a sorbent, piezo-quartz detection, and regenerating sensor is characterized by that resonator electrodes are modified by polyethylene glycol-2000 or trioctylamine oxide in quantity 5-7 mcg, applied from toluene or acetone solution with concentration 1 mcg/mcl onto tenso-sensitive region of electrode depending on toluidine isomer to be determined, after which the treated region is dried for 2 h at 150 C. When compared to the known method, the method of invention allows analysis time to be reduced by 1.5-2 times and, in repeated determination on formed sorbent, by 3-4 times. Reproducibility of the sorption on the same film of modifier is increased by 10 times. EFFECT: reduced (twice) detection threshold and increased (twice) sensitivity of resonator to toluidines. 2 tbl, 14 ex
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