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Photolysis of chlorpyrifos‐methyl, chlorpyrifos‐methyl oxon, and 3,5,6‐trichloro‐2‐pyridinol
Author(s) -
Lobatto Virginia L.,
Argüello Gustavo A.,
Buján Elba I.
Publication year - 2019
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.3957
Subject(s) - chemistry , photodegradation , oxon , photodissociation , mass spectrometry , acetonitrile , photochemistry , reaction mechanism , chromatography , organic chemistry , photocatalysis , catalysis , neuroscience , biology
The photodegradation of chlorpyrifos‐methyl ( 1 ), and two of its photodegradation products, chlorpyrifos‐methyl oxon ( 2 ), and 3,5,6‐trichloro‐2‐pyridinol ( 3 ) was studied using low pressure Hg lamps irradiating at 254 nm either in pure acetonitrile (ACN) or in 10% ACN/H 2 O. Experiments conducted in pure ACN allowed us to identify the photoproducts in the photolysis of 1 , 2 , and 3 both, in air saturated samples and in the absence of oxygen as analyzed by gas chromatography–mass spectrometry (GC‐MS), high resolution mass spectrometry (HRMS), and phosphorus‐31 nuclear magnetic resonance ( 31 P NMR). Since 2 and 3 are products in the photodegradation of 1 , their degradations in 10% ACN/H 2 O were independently measured, and it was determined that 1 and 2 degrade at comparable rates. Instead, 3 does not interfere in the measurement since it degrades much faster, and their products do not absorb in the region of 1 . Our results indicate that short wave photolysis could become a plausible detoxification mechanism.