Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 4, pp. 592−596.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © S.I. Niftaliev, S.E. Plotnikov, N.Ya. Mokshina, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 4, pp. 556−560.
OF SYSTEMS AND PROCESSES
Kinetic Absorption of Vapors of Alkyl Acetates C
and Diethyl Ether on Thin Films
of Modiﬁ ed Piezoelectric Quartz Resonators
S. I. Niftaliev
, S. E. Plotnikova
, and N. Ya. Mokshina
Voronezh State Technological Academy, Voronezh, Russia
Voronezh Institute of Air Force Engineering, Voronezh, Russia
Received January 20, 2010
Abstract—Sorption of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and diethyl ether on thin ﬁ lms
of esters: poly(ethylene glycol) sebacate and phthalate, dinonyl phthalate, tween-40, pentaerythritol tetrabenzoate,
triphenyl phosphate, Triton X-305, and stearic acid was studied. The mass of sorbent ﬁ lms was optimized, the
sensitivity and selectivity of modiﬁ ers toward analytes was evaluated, and the time of maximum sorption was
As objects of study served acetic acid esters (meth-
yl acetate, ethyl acetate, propyl acetate, butyl acetate)
and diethyl ether. These compounds are widely used
in chemical, wood, paint-and-varnish, and food indus-
tries ; they are contained in wastes from shops for
manufacture of pharmaceutical preparations, wax, fats,
and synthetic fragrance compounds. Moreover, they are
needed as solvents for recovery of tars, concretes, res-
inoids, and essence oils from natural raw materials .
The control over the content of esters and ethers in air
is one of the most important tasks because alkyl acetates
and diethyl ether irritate conjunctivas and mucous
membranes of the upper respiratory tract, exhibit a skin-
resorptive effect, accumulate in organisms long exposed
to these compounds, and adversely affect the nervous
At present, multisensor systems based on
piezoelectric quartz sensors are widely used to analyze
objects in the environment. These systems can rapidly,
reliably, and very accurately detect toxic compounds in
air of working zones and populated areas and industrial
The goal of our study was to ﬁ nd common
fundamental aspects of the sorption of esters for their
separate determination in air by an array of modiﬁ ed
piezoelectric quartz sensors.
Determination of aroma-producing compounds
with a piezoelectric quartz microbalance includes
modiﬁ cation of the resonator electrodes with a sorbent
solution, subsequent removal of the solvent, introduction
of an air sample to be analyzed into the detector cell, and
recording of the analytical signal.
Piezoelectric quartz AT-cut resonators with
a resonator frequency of 8–10 MHz were degreased
with ethanol and modiﬁ ed by deposition of sorbent
solutions, with the subsequent thermal removal of the
solvent (static evaporation technique). As solvents
served acetone [for Tween-40 and poly(ethylene glycol)
phthalate] and toluene (for the rest of the modiﬁ ers).
The modiﬁ er solution volume was adjusted depending
on the necessary mass of a sorbent. The ﬁ lm mass m
(μg) was calculated by the Sauerbray equation 
= ––––––, (1)