The Experts below are selected from a list of 2574 Experts worldwide ranked by ideXlab platform
Mu Sang Lee - One of the best experts on this subject based on the ideXlab platform.
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Surface-enhanced Raman spectroscopy of Omethoate adsorbed on silver surface.
Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2010Co-Authors: Hee Jin Kim, Chul Jae Lee, Mohammad Rezaul Karim, Mak Soon Kim, Mu Sang LeeAbstract:Abstract We have investigated surface-enhanced Raman spectroscopy (SERS) spectrum of Omethoate (O,O-dimethyl-S-methylcarbamoylmethylthiophosphate). It is found significant signals in the ordinary Raman spectrum for solid-state Omethoate as well as strong vibrational signals absorbed on the silver sol surface which is prepared by γ-irradiation technique at a very low concentration. Effects of pH and anions (Cl − , Br − , I − ) on the adsorption orientation are investigated as well. Two different adsorption mechanisms are deduced, depending on the experimental conditions. The sulfur atom or the sulfur and two oxygen atoms are adsorbed onto the silver sol surface. Among halide ions, Br − and I − are more strongly adsorbed onto the silver sol surface. As a result, the adsorption of Omethoate is less effective due to their steric hindrance.
Ting-tiao Pan - One of the best experts on this subject based on the ideXlab platform.
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Detection of Omethoate residues in peach with surface-enhanced Raman spectroscopy.
Food Analytical Methods, 2018Co-Authors: Tehseen Yaseen, Da-wen Sun, Ting-tiao PanAbstract:In this work, surface-enhanced Raman spectroscopy (SERS) was used with silver colloid substrate for rapid detection of Omethoate (an organophosphate pesticide) in standard solution and peach extract. The findings demonstrated that the characteristic wavenumber of the pesticide could be precisely identified using the SERS method. The calibration curve was plotted between concentrations and Raman intensities of the target peak at 1649 cm−1 for the peach extract and at 1647 cm−1 for the standard solution. The coefficients of determination (R2) of 0.9829 and 0.98 were obtained for standard solution and for peach extract, respectively. The calculated limits of detection for Omethoate in standard solution and in peach extracts were 0.001 mg L−1 and 0.01 mg kg−1, respectively. This study revealed that the proposed method could be used for the analysis of trace contaminants like Omethoate in multifaceted food matrices.
Hee Jin Kim - One of the best experts on this subject based on the ideXlab platform.
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Surface-enhanced Raman spectroscopy of Omethoate adsorbed on silver surface.
Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2010Co-Authors: Hee Jin Kim, Chul Jae Lee, Mohammad Rezaul Karim, Mak Soon Kim, Mu Sang LeeAbstract:Abstract We have investigated surface-enhanced Raman spectroscopy (SERS) spectrum of Omethoate (O,O-dimethyl-S-methylcarbamoylmethylthiophosphate). It is found significant signals in the ordinary Raman spectrum for solid-state Omethoate as well as strong vibrational signals absorbed on the silver sol surface which is prepared by γ-irradiation technique at a very low concentration. Effects of pH and anions (Cl − , Br − , I − ) on the adsorption orientation are investigated as well. Two different adsorption mechanisms are deduced, depending on the experimental conditions. The sulfur atom or the sulfur and two oxygen atoms are adsorbed onto the silver sol surface. Among halide ions, Br − and I − are more strongly adsorbed onto the silver sol surface. As a result, the adsorption of Omethoate is less effective due to their steric hindrance.
Tehseen Yaseen - One of the best experts on this subject based on the ideXlab platform.
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Detection of Omethoate residues in peach with surface-enhanced Raman spectroscopy.
Food Analytical Methods, 2018Co-Authors: Tehseen Yaseen, Da-wen Sun, Ting-tiao PanAbstract:In this work, surface-enhanced Raman spectroscopy (SERS) was used with silver colloid substrate for rapid detection of Omethoate (an organophosphate pesticide) in standard solution and peach extract. The findings demonstrated that the characteristic wavenumber of the pesticide could be precisely identified using the SERS method. The calibration curve was plotted between concentrations and Raman intensities of the target peak at 1649 cm−1 for the peach extract and at 1647 cm−1 for the standard solution. The coefficients of determination (R2) of 0.9829 and 0.98 were obtained for standard solution and for peach extract, respectively. The calculated limits of detection for Omethoate in standard solution and in peach extracts were 0.001 mg L−1 and 0.01 mg kg−1, respectively. This study revealed that the proposed method could be used for the analysis of trace contaminants like Omethoate in multifaceted food matrices.
Mohammad Rezaul Karim - One of the best experts on this subject based on the ideXlab platform.
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Surface-enhanced Raman spectroscopy of Omethoate adsorbed on silver surface.
Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2010Co-Authors: Hee Jin Kim, Chul Jae Lee, Mohammad Rezaul Karim, Mak Soon Kim, Mu Sang LeeAbstract:Abstract We have investigated surface-enhanced Raman spectroscopy (SERS) spectrum of Omethoate (O,O-dimethyl-S-methylcarbamoylmethylthiophosphate). It is found significant signals in the ordinary Raman spectrum for solid-state Omethoate as well as strong vibrational signals absorbed on the silver sol surface which is prepared by γ-irradiation technique at a very low concentration. Effects of pH and anions (Cl − , Br − , I − ) on the adsorption orientation are investigated as well. Two different adsorption mechanisms are deduced, depending on the experimental conditions. The sulfur atom or the sulfur and two oxygen atoms are adsorbed onto the silver sol surface. Among halide ions, Br − and I − are more strongly adsorbed onto the silver sol surface. As a result, the adsorption of Omethoate is less effective due to their steric hindrance.
