Laboratory batch experiments were designed to study the adsorption of cadusafos on two types of s... more Laboratory batch experiments were designed to study the adsorption of cadusafos on two types of soils: clay loamy and sandy, collected from two regions around the Nile Delta in Egypt. The adsorption process is fast reaching equilibrium in 60min, decreases with increasing soil mass and independent on pH in the range 3–11. The experimental results were well fitted to linear
A facile eco-friendly approach for acetampirid pesticide removal is presented. The method is base... more A facile eco-friendly approach for acetampirid pesticide removal is presented. The method is based on the use of micro- and mesoporous activated carbon (TPAC) as a natural adsorbent. TPAC was synthesized via chemical treatment of tangerine peels with phosphoric acid. The prepared activated carbon was characterized before and after the adsorption process using Fourier- transform infrared (FTIR), X-ray diffraction (XRD), particle size and surface area. The effects of various parameters on the adsorption of acetampirid including adsorbent dose (0.02–0.2 g), pH 2–8, initial adsorbate concentration (10–100 mg/L), contact time (10–300 min) and temperature (25–50 °C) were studied. Batch adsorption features were evaluated using Langmuir and Freundlich isotherms. The adsorption process followed the Langmuir isotherm model with a maximum adsorption capacity of 35.7 mg/g and an equilibration time within 240 min. The adsorption kinetics of acetamiprid was fitted to the pseudo-second-order kinet...
The objective of this study is to perform a safety assessment of chromafenozide residue level on ... more The objective of this study is to perform a safety assessment of chromafenozide residue level on tomato at the Egyptian national level. An open field decline study of chromafenozide on tomato was performed. The theoretical maximum daily intake (TMDI) of chromafenozide was calculated for assessing the chronic dietary exposure indicating that the ADI value of chromafenozide (0.27 mg/kg bw/day) was not exceeded. As a result, the safety assessment of chromafenozide residue levels was attained. A validated method of the QuEChERS approach followed by HPLC-DAD analysis was used to determine the chromafenozide residues. The recoveries ranged from 70 to 88% with relative standard deviations ranging from 2.0 to 9.0%. The limit of quantitation was 0.01 mg/kg. The half-life of chromafenozide on tomatoes was 3.5 days.
The biosorption of apricot stone activated carbon (ASAC) from aqueous solution was investigated u... more The biosorption of apricot stone activated carbon (ASAC) from aqueous solution was investigated using low-cost, natural and ecofriendly biosorbent. The biosorption studies were carried out under various parameters, such as biosorbent dosage, initial pesticide concentration, contact time and temperature. The experimental results show that the percentage of biosorption increases with an increase in the biosorbent dosage. The equilibrium uptake was increased with an increase in the initial pesticide concentration in solution. Biosorption kinetic data were fitted well with the pseudo-second order kinetic model. The adsorption isotherms closely followed the Langmuir model. The monolayer adsorption capacity of the apricot stone for ethoprophos was found as 20.04 mg g. The thermodynamic data indicated that the adsorption of ethoprophos on apricot stone activated carbon was feasible, spontaneous and endothermic in nature. The results revealed that the ASAC could be used as a low cost altern...
Laboratory batch experiments were designed to study the adsorption of cadusafos on two types of s... more Laboratory batch experiments were designed to study the adsorption of cadusafos on two types of soils: clay loamy and sandy, collected from two regions around the Nile Delta in Egypt. The adsorption process is fast reaching equilibrium in 60min, decreases with increasing soil mass and independent on pH in the range 3–11. The experimental results were well fitted to linear
A facile eco-friendly approach for acetampirid pesticide removal is presented. The method is base... more A facile eco-friendly approach for acetampirid pesticide removal is presented. The method is based on the use of micro- and mesoporous activated carbon (TPAC) as a natural adsorbent. TPAC was synthesized via chemical treatment of tangerine peels with phosphoric acid. The prepared activated carbon was characterized before and after the adsorption process using Fourier- transform infrared (FTIR), X-ray diffraction (XRD), particle size and surface area. The effects of various parameters on the adsorption of acetampirid including adsorbent dose (0.02–0.2 g), pH 2–8, initial adsorbate concentration (10–100 mg/L), contact time (10–300 min) and temperature (25–50 °C) were studied. Batch adsorption features were evaluated using Langmuir and Freundlich isotherms. The adsorption process followed the Langmuir isotherm model with a maximum adsorption capacity of 35.7 mg/g and an equilibration time within 240 min. The adsorption kinetics of acetamiprid was fitted to the pseudo-second-order kinet...
The objective of this study is to perform a safety assessment of chromafenozide residue level on ... more The objective of this study is to perform a safety assessment of chromafenozide residue level on tomato at the Egyptian national level. An open field decline study of chromafenozide on tomato was performed. The theoretical maximum daily intake (TMDI) of chromafenozide was calculated for assessing the chronic dietary exposure indicating that the ADI value of chromafenozide (0.27 mg/kg bw/day) was not exceeded. As a result, the safety assessment of chromafenozide residue levels was attained. A validated method of the QuEChERS approach followed by HPLC-DAD analysis was used to determine the chromafenozide residues. The recoveries ranged from 70 to 88% with relative standard deviations ranging from 2.0 to 9.0%. The limit of quantitation was 0.01 mg/kg. The half-life of chromafenozide on tomatoes was 3.5 days.
The biosorption of apricot stone activated carbon (ASAC) from aqueous solution was investigated u... more The biosorption of apricot stone activated carbon (ASAC) from aqueous solution was investigated using low-cost, natural and ecofriendly biosorbent. The biosorption studies were carried out under various parameters, such as biosorbent dosage, initial pesticide concentration, contact time and temperature. The experimental results show that the percentage of biosorption increases with an increase in the biosorbent dosage. The equilibrium uptake was increased with an increase in the initial pesticide concentration in solution. Biosorption kinetic data were fitted well with the pseudo-second order kinetic model. The adsorption isotherms closely followed the Langmuir model. The monolayer adsorption capacity of the apricot stone for ethoprophos was found as 20.04 mg g. The thermodynamic data indicated that the adsorption of ethoprophos on apricot stone activated carbon was feasible, spontaneous and endothermic in nature. The results revealed that the ASAC could be used as a low cost altern...
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