Research output: Contribution to journal › Article › peer-review
New insights into mechanism of direct UV photolysis of p-arsanilic acid. / Tyutereva, Yuliya E.; Sherin, Petr S.; Parkhats, Marina V. et al.
In: Chemosphere, Vol. 220, 01.04.2019, p. 574-581.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - New insights into mechanism of direct UV photolysis of p-arsanilic acid
AU - Tyutereva, Yuliya E.
AU - Sherin, Petr S.
AU - Parkhats, Marina V.
AU - Liu, Zizheng
AU - Xu, Jing
AU - Wu, Feng
AU - Plyusnin, Victor F.
AU - Pozdnyakov, Ivan P.
N1 - Publisher Copyright: © 2018 Elsevier Ltd
PY - 2019/4/1
Y1 - 2019/4/1
N2 - The mechanism of direct UV photolysis of p-arsanilic acid (p-ASA), a widely used veterinary drug, was revised by means of laser flash photolysis coupled with high resolution liquid chromatography – mass spectrometry (LC-MS). None of p-ASA triplet state or singlet oxygen was found to directly participate in the photodegradation of p-ASA as it was assumed in previous works. Here we demonstrate that the main primary photoprocess is a monophotonic ionization (ϕion 266nm = 0.032) leading to the formation of hydrated electron and corresponding anilinyl cation radical. These primary species react with dissolved oxygen yielding secondary reactive oxygen species. The final organic photoproducts, such as aminophenol and different dimeric products, originate from various reactions between these secondary species. The generation of inorganic arsenic, both As(V) and As(III), was also observed in agreement with previous works. For the first time we report the quantum yield of p-ASA photodegradation, which decreases from 0.058 to 0.035 with the excitation wavelength from 222 to 308 nm.
AB - The mechanism of direct UV photolysis of p-arsanilic acid (p-ASA), a widely used veterinary drug, was revised by means of laser flash photolysis coupled with high resolution liquid chromatography – mass spectrometry (LC-MS). None of p-ASA triplet state or singlet oxygen was found to directly participate in the photodegradation of p-ASA as it was assumed in previous works. Here we demonstrate that the main primary photoprocess is a monophotonic ionization (ϕion 266nm = 0.032) leading to the formation of hydrated electron and corresponding anilinyl cation radical. These primary species react with dissolved oxygen yielding secondary reactive oxygen species. The final organic photoproducts, such as aminophenol and different dimeric products, originate from various reactions between these secondary species. The generation of inorganic arsenic, both As(V) and As(III), was also observed in agreement with previous works. For the first time we report the quantum yield of p-ASA photodegradation, which decreases from 0.058 to 0.035 with the excitation wavelength from 222 to 308 nm.
KW - Hydrated electron
KW - Organic radicals
KW - p-arsanilic acid
KW - Photoionization
KW - Reactive oxygen species
KW - Transient species
KW - PATHWAYS
KW - ANILINE
KW - OXYGEN
KW - QUANTUM YIELD
KW - KINETICS
KW - WAVELENGTH
KW - WATER
KW - Reactive Oxygen Species
KW - Arsanilic Acid/radiation effects
KW - Oxygen/chemistry
KW - Ultraviolet Rays
KW - Photolysis
KW - Lasers
UR - http://www.scopus.com/inward/record.url?scp=85059548692&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2018.12.179
DO - 10.1016/j.chemosphere.2018.12.179
M3 - Article
C2 - 30597365
AN - SCOPUS:85059548692
VL - 220
SP - 574
EP - 581
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
ER -
ID: 18067359