Oxidative degradation and mineralization of bentazone from water

Marija V Pergal,Igor D Kodranov,Miodrag M Pergal,Viacheslav V Avdin,Dragan D Manojlović

doi:10.1080/03601234.2020.1816091

Abstract

Bentazone degradation efficiency and mineralization in water solutions using chlorine dioxide treatment were evaluated. Double distilled water and a river water sample spiked with bentazone were studied and compared after chlorine dioxide treatment. Degradation efficiency was determined using high-performance liquid chromatography (HPLC). Daphnia magna toxicity testing and total organic carbon (TOC) analysis were used to ascertain the toxicity of the degraded solutions and mineralization degree. Bentazone degradation products were identified using gas chromatography with a triple quadrupole mass detector (GC-MS-MS). A simple mechanistic scheme for oxidative degradation of bentazone was proposed based on the degradation products that were identified. Decrease in D. magna mortality, high degradation efficiency and partial bentazone mineralization were achieved by waters containing bentazone degradation products, which indicate the formation of less toxic compounds than the parent bentazone and effective removal of bentazone from the waters. Bentazone degraded into four main degradation products. Humic acid from Sava River water influenced bentazone degradation, resulting in a lower degradation efficiency in this matrix (about 10% lower than in distilled water). Chlorine dioxide treatment of water to degrade bentazone is efficient and offers a novel approach in the development of new technology for removal of this herbicide from contaminated water.

Highlights

In environmental research, the use of pesticides including herbicides to increase agricultural production is an important segment.[1]
In this study we have investigated, analyzed, and compared applied techniques in order to achieve efficient removal of bentazone from water solutions and analyze the products of degradation
An important aspect of the results obtained was that bentazone degradation products were less toxic than their respective parent bentazone solutions, so toxicity decreased after ClO2 treatment

Summary

Introduction

The use of pesticides including herbicides to increase agricultural production is an important segment.[1] Various factors, biological, chemical and physical, can influence degradation of pesticides after they have been applied in the field, while these compounds can be transported by leaching or adsorbed by colloids in soil.[2,3] Water movement influences the transport of pesticides (i.e. drainage, infiltration and plant uptake).[4] pesticide transport is influenced by soil matrix interactions such as clay content, organic matter content and iron oxides.[4] Release of pesticides into the environment and their removal from drinking and wastewaters is a major concern for environmental remediation that has attracted many research projects in recent years.[5,6,7,8,9] Regarding that, there is certainly a growing demand for the improvement and development of technologies for effective water purification treatments

Objectives

Methods

Results

Conclusion