不同来源腐殖酸存在下对硫磷的光化学行为

Photochemical behavior of parathion in the presence of humic acids from different origins.

作者信息

Santos Francismário F, Martin-Neto Ladislau, Airoldi Flavia Pereira Silva, Rezende Maria O O

机构信息

University of São Paulo, Institute of Chemistry of São Carlos, 13560-970 São Carlos SP, Brazil.

出版信息

J Environ Sci Health B. 2005;40(5):721-30. doi: 10.1080/03601230500189246.

DOI:10.1080/03601230500189246

PMID:16190016

Abstract

This paper reports the effect of ultraviolet radiation on the degradation of pesticide ethyl parathion in the presence of humic acids. Ethyl parathion was completely degraded in 300 min using an artificial lamp of 7.41 x 10(-10) einstein/s. Humic acid from peat did not influence the photochemical rate (k = 8.92 x 10(-3) min). However, in the presence of aquatic humic acid, the photochemical rate was higher (11.5 x 10(-3) min). The analytical determinations show the presence of p-nitrophenol and aminophenol in the reaction medium during the photochemical experiments. The kinetic of degradation in all experiments obeyed a first-order reaction pattern.

摘要

本文报道了在腐殖酸存在下紫外线辐射对农药对硫磷降解的影响。使用7.41×10⁻¹⁰爱因斯坦/秒的人工光源，对硫磷在300分钟内完全降解。泥炭腐殖酸不影响光化学速率（k = 8.92×10⁻³分钟⁻¹）。然而，在水生腐殖酸存在下，光化学速率更高（11.5×10⁻³分钟⁻¹）。分析测定表明，在光化学实验过程中反应介质中存在对硝基苯酚和氨基酚。所有实验中的降解动力学均符合一级反应模式。