FIELD: analytical methods. SUBSTANCE: coating of piezoquartz AT-cut resonators (oscillation frequency 8-9.5 MHz) is composed, wt.%: polyvinylpyrrolidone, 15; 4-aminoantipyrin, 80-70; and potassium ferricyanide, 5-15. Lower limit for assessment of volatile phenols using piezoquartz sensors with coating of invention is 0.06 mg/cu.m corresponding to 0.2 maximum permissible concentration for phenol. EFFECT: increased accuracy.
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