a Department of Chemistry , University of KwaZulu Natal , Pietermaritzburg , South Africa.
J Environ Sci Health B. 2019;54(7):569-579. doi: 10.1080/03601234.2019.1621113. Epub 2019 Jun 5.
This study reports on the development and application of solid phase extraction (SPE) and ultrasonic extraction (UE) methods for the analysis of triazine herbicides in water, soil and sediment samples. The extraction parameters such as conditioning solvent, sample loading volume, eluting solvent, extraction time and sample mass were optimized due to their influence on the extraction efficiency of the analytes. To assess the applicability of the SPE and UE methods, spiked distilled water or soil samples were extracted and analyzed using an LC-PDA instrument. The recoveries obtained under optimum conditions were between 65-94% and 75-100% for SPE and UE, respectively. The relative standard deviations obtained were less than 0.36% for SPE and less than 4.6% for UE. The limit of detection (LOD) ranged from 0.026-0.084 µg/L for SPE and 0.0028-0.0083 mg/kg for UE. The limit of quantification (LOQ) was between 0.088-0.28 µg/L for SPE and 0.0089-0.028 mg/kg for UE. The concentrations of triazines were found to be between 0.96-7.4 µg/L and 0.79-15 µg/L in river water and wastewater effluent samples, respectively. In sediment samples, the triazine concentrations were found to be between 0.032-0.93 mg/kg, while in soil samples they were between 0.12-1.03 mg/kg.
本研究报告了固相萃取（SPE）和超声提取（UE）方法在分析水中、土壤和沉积物样品中三嗪类除草剂的开发和应用。由于提取参数（如调节溶剂、样品加载体积、洗脱溶剂、提取时间和样品质量）会影响分析物的提取效率，因此对其进行了优化。为了评估 SPE 和 UE 方法的适用性，对加标蒸馏水或土壤样品进行了提取和分析，使用 LC-PDA 仪器进行分析。在最佳条件下，SPE 和 UE 的回收率分别在 65-94%和 75-100%之间。SPE 的相对标准偏差小于 0.36%，UE 的相对标准偏差小于 4.6%。SPE 的检测限（LOD）范围为 0.026-0.084μg/L，UE 的检测限（LOD）范围为 0.0028-0.0083mg/kg。SPE 的定量限（LOQ）范围为 0.088-0.28μg/L，UE 的定量限（LOQ）范围为 0.0089-0.028mg/kg。在河水和废水排放样品中，三嗪类化合物的浓度分别为 0.96-7.4μg/L 和 0.79-15μg/L。在沉积物样品中，三嗪类化合物的浓度为 0.032-0.93mg/kg，而在土壤样品中为 0.12-1.03mg/kg。
