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Trace organic phosphorus pesticide degradation and rapid detection method

Author: ZhaoZhengYa
Tutor: LiNai
School: Tianjin University of Technology
Course: Applied Chemistry
Keywords: Organophosphorus pesticides Palladium (II) Silver (I) Quantitative detection Oxidative degradation Metalloporphyrins
CLC: TS207.53
Type: Master's thesis
Year: 2011
Downloads: 135
Quote: 0
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Abstract


Organophosphorus pesticide production and application of long history, is China's pesticide market, the main categories of pesticides in crop protection and indoor parasite control plays an important role. The widespread use of organophosphorus pesticides in agriculture to flourish, but also to the ecological environment, human health brought great pressure and potential threats, especially organophosphorus pesticide residues in food safety problems caused by increasingly attention. Detection of organophosphorus pesticides are mainly spectrometry, chromatography and enzymatic detection method is getting lower and lower detection limits, increasing sensitivity of the method. Organophosphorus pesticides degrade or remove methods are mainly physical degradation, catalytic oxidative degradation, light excitation and biological degradation and other methods. This thesis consists of two parts. The first part of the metal porphyrin conditions using Na 2 S 2 O 8 , H 2 O < sub> 2 , CH3COOH, NaClO four kinds oxidant degradation of organic phosphorus dichlorvos (DDVP) methods and effects of. Discussed metalloporphyrins reagents and oxidants on the degradation reaction, studied architecture at different temperatures and acidity conditions, pesticide degradation, and finally examines the Meso-tetrakis - (4 - sulfophenyl) porphyrin cobalt (CoTPPS4) and Na 2 S 2 O 4 and H 2 O 2 combination oxidant system on the pesticide degradation. The results of these pesticides metalloporphyrins have some catalytic degradation reaction, in which the Meso-tetrakis - (4 - sulfophenyl) porphyrin cobalt highest catalytic activity when Na 2 S 2 O 4 / H 2 O 2 mixed oxidant was 4:1 when the best pesticide degradation efficiency . The latter part of acephate, omethoate, phorate three kinds of organophosphorus pesticides UV-visible spectroscopy methods of research, the use of Pd (II) and Ag (I) with two metal ions can hydrolyze organophosphorus pesticides or product formation complexes characteristic developed two rapid, simple and sensitive method for detecting organophosphorus pesticides. Complex solution absorbance with acid, metal ion concentration increased first and then decreased, and in accordance with the reagents orthogonal choose the best content on the method detection limit and the absorption wavelength of the molar absorption coefficient were determined molar absorption coefficient up to 105 orders of magnitude.

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CLC: > Industrial Technology > Light industry,handicrafts > Food Industry > General issues > Food standards and testing > Determination of food contamination > Determination of pesticide residues
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