Stereoselective uptake and degradation of (±)‐o,p‐DDD pesticide stereomers in water‐sediment system

Abstract

The environmental stereoselective uptake and degradation of (±)-o,p-DDD pesticide stereomers in water-sediment system are described. The results were analyzed by artificial neural network model. The optimized experimental parameters were concentration of o,p-DDD streamers (7.0 μg L ), experimental time (60 min), pH (6), dose (5.0 g L ), and temperature (25°C). The maximum uptake and degradation were 87% and 85% and 33.0% and 30.5% for (-)- and (+)-stereomers of o,p-DDD in 15-day time. Both uptake and degraded phenomenon showed first-order rate reaction. Thermodynamic variables indicated exothermic nature of uptake and degradation processes. The uptake and degradation were slightly higher for (-)-stereomer than (+)-stereomer of o,p-DDD. It was assumed that both uptake and degradation processes are accountable for the removal of the streomers of o,p-DDD from earth's ecosystem, but the uptake is responsible for major contribution. The magnitudes of relative errors obtained by artificial neural network model were in the range of ±0.2 to 3.5, indicating good applicability of the experimental data. The results are very useful to control the environmental contamination due to the chiral o,p-DDD pesticide as its two enantiomers have different ecological toxicities.

Changes in landscape composition and configuration in the Beressa watershed, Blue Nile basin of Ethiopian Highlands: historical and future exploration

“…Because of increasing human activities, environmental problem has become widespread in many parts of the world. The deterioration in environmental quality and widespread environmental degradation (biological and chemical) by air and water pollution ( Basheer, 2017 ; Basheer and Ali, 2018 ; Burakova et al., 2018 ; Alharbi et al., 2018 ; Ali et al., 2005 , 2015 ; Mohd and Khan, 2013 ; Alia and Alwarthan, 2017 ), and soil and vegetation loss can result in negative ecological and health consequences ( Dunlap and Jorgenson, 2012 ). Ethiopia has been experiencing a range of environmental problems including deforestation, soil erosion, land degradation and fragmentation, and loss of biodiversity ( Daley, 2015 ).…”

Removal of Copper(II) and Zinc(II) Ions in Water on a Newly Synthesized Polyhydroquinone/Graphene Nanocomposite Material: Kinetics, Thermodynamics and Mechanism

“…Adsorption process appears to be the most applicable and efficient technique. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] It makes possible to remove various harmful impurities practically down to low concentrations. [21][22][23][24][25][26][27][28][29][30][31][32][33] The efficiency of removing various contaminants depends on the type of adsorption material used.…”

Enantioselective degradation of dufulin pesticide in water: Uptake, thermodynamics, and kinetics studies

“…Among many pesticides, some are chiral in nature and exist in racemic form. The two enantiomers have different insecticidal activities and biodegradation in the environment . The rising alerts on the side effects of chiral chemicals on nontarget animals, human beings and ecology, the researchers, academicians, and Government authorities are promoting the use of enantiomerically pure agrochemicals .…”

“…The two enantiomers have different insecticidal activities and biodegradation in the environment. [19][20][21][22][23][24][25][26][27] The rising alerts on the side effects of chiral chemicals on nontarget animals, human beings and ecology, the researchers, academicians, and Government authorities are promoting the use of enantiomerically pure agrochemicals. Therefore, it is essential to study the sorption and biodegradation of racemic and enantiomeric pesticides to determine their fates in the ecology.…”