Degradation of Organophosphorus Insecticides in Environmental Matrices

“…They inhibit acetylcholinesterase (AChE) activity not only in insects, but can also affect the nervous system of other organisms as well as humans [1,2]. Investigation and understanding of the stability and transformations of OP compounds in the environment has, therefore, been the subject of extensive studies, since it is important from the toxicological aspect as well as for the search and development of efficient methods for detoxification and removal of OP compounds as hazardous wastes.…”

Section: Introductionmentioning

confidence: 99%

“…OP esters are very susceptible to hydrolysis, which is, therefore, their most common degradation pathway [2]. Hydrolysis can occur when dissolved metal ions enhance the rate of hydrolysis by catalysis [3] or by the pH [4].…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of pesticides and application of bioanalytical methods for their detection

Franko

Sarakha

Čibej

et al. 2005

Pure and Applied Chemistry

View full text Add to dashboard Cite

Photodegradation of coumaphos and azinphos-methyl in the air, in oxygen, and in nitrogen atmosphere (quartz reactor equipped with six 18-W lamps with the maximum emission intensity at 310 nm) was studied. The fastest reaction occurred with coumaphos in nitrogen atmosphere (complete decomposition in 10 min), where the formation of a new compound was also detected by high-performance liquid chromatography (HPLC). In the case of azinphos-methyl, no additional signals in HPLC chromatogram were observed. The rearrangement mechanism, involving a triplet-state activation complex and the formation of an acetylcholinesterase (AChE)-inhibiting oxo analog of coumaphos was verified and confirmed by laser flash photolysis.The suitability of bioanalytical flow-injection analysis (FIA) systems, based on AChE inhibition and spectrophotometric or thermal lens spectrometric detection for rapid and sensitive screening in food quality control was demonstrated. Owing to the high sensitivity of thermal lens spectrometry (TLS), several steps in sample preparation can be avoided (preconcentration, purification, isolation) and incubation times reduced. High sample throughputs (10 h -1 ) are, however, also achievable for medium toxic oxo organophosphorus (OP) pesticides using spectrophotometric detection providing limits of detection (LODs) at the level of 10 ppb malaoxon equivalents, which is still about 50 times below maximal residue levels. Testing of the method for practical application on a set of 60 samples gave no false negative results and a level of 1.7 % false positives.

show abstract

“…In addition, they have been used as chemical warfare nerve agents 4 . Phosphorus chemistry has been developing in recent years as one of the most important branches of science [5][6] . Theoretical calculations of organophosphorus and phosphenium complexes have good attention between researchers in many years [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

New Phosphorus Compounds K[pcl3(x)] (X= Scn, Cn): Preparation and DFT and Spectroscopic Studies

Lashgari

Ghamami

Salgado-Morán

et al. 2016

J. Chil. Chem. Soc.

View full text Add to dashboard Cite

Two new phosphorus complexes, potassium trichlorothiocyanophosphate (III) (PTCTCP; K[PCl 3 (SCN)]) and potassium trichlorocyanophosphate (III) (PTCCP; K[PCl 3 (CN)]) were synthesized from the reaction of KSCN and KCN, respectively, with PCl 3 . The chemical formulas and compositions of these compounds were determined by elemental analysis and spectroscopic methods, such as phosphorus-31 nuclear magnetic resonance (NMR) spectroscopy ( 31 P-NMR), Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy and mass spectrophotometry. All of the theoretical calculations and determinations of the properties of these compounds were performed as part of the Amsterdam Density Functional (ADF) program. Excitation energies were assessed using time-dependent perturbation density functional theory (TD-DFT). In addition, the molecular geometry was optimized and the frequencies and excitation energies were calculated using standard Slater-type orbital (STO) basis sets with triple-zeta quality double plus polarization functions (TZ2P) for all of the atoms. The assignment of the principal transitions and total densities of state (TDOS) for orbital analysis were performed using the GaussSum 2.2 program.

show abstract

Degradation of Organophosphorus Insecticides in Environmental Matrices

Cited by 52 publications

References 90 publications

Photodegradation and Hydrolysis of Chlorpyrifos in Aqueous Systems

Photodegradation and Hydrolysis of Chlorpyrifos in Aqueous Systems

Photodegradation of pesticides and application of bioanalytical methods for their detection

New Phosphorus Compounds K[pcl3(x)] (X= Scn, Cn): Preparation and DFT and Spectroscopic Studies

Contact Info

Product

Resources

About