光谱学与光谱分析 |
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Spectroscopic Analysis of Organophosphorus Pesticides Using Colorimetric Reactions |
Amit Kumar Sharma |
Department of Physics, College of Engineering, Teerthanker Mahaveer University NH-24, Delhi Road, Moradabad-244001, UP, India |
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Abstract The UV-Vis and infrared (IR) absorption spectra of organophosphorus (OP) pesticides have been studied. A correlation in spectra was developed to optimize the OP pesticides in the environments. The spectroscopic (UV-Vis and IR) spectrum of OP pesticides like methyl parathion, malathion and parathion has been interpreted in detail. A complete calculation of the normal frequencies and absolute intensities of UV-Vis and IR absorption bands are interpreted with the help of corresponding experimental data. In the colorimetric reactions, the bands appear at 2 077, 1 637, 1 455, 1 015, 655 cm-1 for malathion; 2 081, 1 639, 1 316, 1 015, 794, 683 cm-1 for parathion; 2 078, 1 632, 1 032, 794 cm-1 for methyl parathion were used for quantitative or qualitative analysis. All these IR spectra were acquired by averaging 100 scans at a resolution of 4 cm-1. It is determined experimentally in the region 200~450 nm for UV-Vis absorption bands and in the region 400~4 000 cm-1 for IR absorption bands. It is concluded that the mainly optically active groups (P—OH, CO, PO, C—O—C, P—O—C, PS, —OH) present in pesticides which are responsible in change in significant data for quantitative and qualitative analysis. The various optical properties like wavelength, band energy, wave number, and frequency, also are calculated.
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Received: 2015-05-28
Accepted: 2015-10-10
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Corresponding Authors:
Amit Kumar Sharma
E-mail: amit_vashishtha1980@rediffmail.com, amit.db1980@gmail.com
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