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.

摘要

评估了使用二氧化氯处理的Bentazone降解效率和水溶液矿化作用。在二氧化氯处理后，对双蒸馏水和掺有苯达松的河水样品进行了研究和比较。使用高效液相色谱法（HPLC）测定降解效率。用大水蚤的毒性测试和总有机碳（TOC）分析来确定降解溶液的毒性和矿化度。使用具有三重四极杆质量检测器（GC-MS-MS）的气相色谱法鉴定了Bentazone降解产物。根据已确定的降解产物，提出了一种简单的苯达松氧化降解机理。D. magna的减少含有苯达松降解产物的水可实现较高的死亡率，较高的降解效率和部分苯达松矿化作用，这表明与母体苯达松相比，毒性较低的化合物形成，并且可从水中有效去除苯达松。Bentazone降解为四种主要降解产物。萨瓦河水中的腐殖酸影响了苯达松的降解，导致该基质的降解效率较低（比蒸馏水低约10％）。用二氧化氯处理水以降解苯达松是有效的，它为开发从污染水中去除这种除草剂的新技术提供了一种新颖的方法。