Abstract

The aim of this study is to investigate the synergetic effect of ozonation on ultraviolet irradiation on the degradation of carbaryl (CBL) (1-naphthyl-N-methylcarbamate) in aqueous solutions (40 mg L⁻¹). The degradation of CBL and the intermediates formed during ozonation were determined by gas chromatography-mass spectrometer. The change in formaldehyde, dissolved oxygen, pH, and total acidity were determined as a function of ozonation time. It was found that the dissolved oxygen and total acidity were increased with the increasing ozonation time but the pH was decreased with the increasing ozonation time. The aliphatic acids formed during ozonation were followed by ion chromatography as a function of ozonation time. It was found that the effect of ozonation is highly effective on the degradation of CBL. The complete degradation of CBL has occurred at 75-second ozonation time. As a consequence of the obtained results the possible degradation pathway was proposed. The results confirmed that ozonation is an effective method for the degradation of CBL.

摘要

这项研究的目的是研究臭氧化对紫外线辐射的协同作用，以降解水溶液（40 mg L ^-1）中的西维因（CBL）（1-萘基-N-甲基氨基甲酸酯））。用气相色谱-质谱仪测定CBL的降解和在臭氧化过程中形成的中间体。确定了甲醛，溶解氧，pH和总酸度的变化与臭氧化时间的关系。发现随着臭氧化时间的增加，溶解氧和总酸度增加，但是随着臭氧化时间的增加，pH降低。在臭氧化过程中形成的脂肪酸随后进行离子色谱，以作为臭氧化时间的函数。发现臭氧化作用对CBL的降解非常有效。CBL的完全降解发生在75秒的臭氧氧化时间。作为获得的结果的结果，提出了可能的降解途径。