Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 7, pp. 1170−1173.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © N.M. Panich, A.F. Seliverstov, B.G. Ershov, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 7, pp. 1098−1101.
OF SYSTEMS AND PROCESSES
Effect of Bicarbonate Ions on Photodecomposition
of Sodium Dodecyl Sulfate in Aqueous Solutions
Containing Hydrogen Peroxide
N. M. Panich, A. F. Seliverstov, and B. G. Ershov
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
Received November 8, 2010
Abstract—Effect exerted by bicarbonate ions on decomposition of sodium dodecyl sulfate in the presence of
hydrogen peroxide under the action of UV light was studied.
It was shown previously  that sodium dodecyl
sulfate (SDS) in the presence of hydrogen peroxide de-
composes under the action of UV light. The process is
caused by oxidation of a compound with hydroxy radicals
formed in Н
photolysis. It is reasonable to expect that
the efﬁ ciency of SDS decomposition is markedly affected
by the acceptors of OH radicals, bicarbonate ions, in
particular. Previously, this effect on oxidation processes
involving OH radicals has been observed [2, 3].
The goal of this study was to determine the speciﬁ c
features of the effect of bicarbonate ions on the photo-
chemical decomposition of SDS in the presence of Н
Al’pha-02 pulsed UV radiation installation with an
average electric power applied to the lamp equal to 200 W
(pulse length 100 μs, pulse repetition frequency f = 2 Hz)
was used in the experiments. Samples were irradiated in
an open cylindrical quartz cell (inner diameter 10 mm,
length 50 mm) with an IFP 1200 xenon lamp with a ﬂ ash
energy of 100 J. The cuvette with a solution was placed
at a distance of 1 cm from the lamp and cooled with an
air ﬂ ow. The volume of the reaction mixture was 10 ml.
The temperature in the reactor did not exceed 20°С.
The pulsed Xe lamp provides a continuous-spectrum
light over the entire UV spectral range (200–400 nm).
The light intensity was measured by the procedure 
of ferrioxalate dosimetry. The intensity of the light
ﬂ ux I incident onto the quartz cuvette was 3.8 × 10
. The operation stability of the xenon lamp was
monitored in the course of the study and no attenuation of
the light ﬂ ux was measured during one year of operation.
The aqueous solutions contained up to 100 mg of
SDS per 1 liter of a solution. The SDS concentration
was found by the extraction-photometric determination
with Methylene Blue by the procedure described in .
The reaction course was also monitored by changes
in optical spectra. The absorption spectra of the solutions
were measured with an SF-2000 spectrophotometer in
a quartz cuvette with an optical path length of 1 cm. рН
of the solutions was controlled in all experiments and, if
necessary, adjusted with a NaOH solution.
concentration in the solutions was
determined from the concentration of the peroxide
[6, 7]. The maximum relative
deviation in this method was 3.0%.
Reagents were analytically pure in all experiments.
Kinetic curves of SDS decomposition under the
irradiation in the presence of H
concentrations of sodium bicarbonate are presented
in Fig. 1. It was found  that the quantum yields of
formation of OH radicals are functions of temperature
= 5.5 ± 1.6 kJ mol
) and solution pH. Taking into