Since the Directive 2013/39/EU included terbutryn to the list of priority substances of all water bodies, a previous method based on dispersive liquid–liquid micro-extraction (DLLME) for the determination of triazines in seawater has been modified. The main change consisted on the use of tandem mass spectrometry instead of diode array as detection technique. Due to the higher sensitivity of mass detector, sample volume was reduced and extraction solvent volume was optimized. The optimum extraction conditions were 5 mL of sample, 50 µL of 1-octanol and an agitation step instead of disperser solvent. The obtained analytical recoveries (73%–101% with relative standard deviations below 4%) meeting the requirements. The limits of quantification (between 0.016 and 0.021 µg L⁻¹) were more than 10 times lower than the limit set by the European Directive 2013/39/EU for terbutryn (0.34 µg L⁻¹). The proposed method was applied to the determination of the target compounds in seawater samples from A Coruña (Galicia, NW of Spain).

中文翻译：

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根据指令2013/39 / EU，从海水中测定三嗪的简单方法。

由于指令2013/39 / EU将叔丁草胺列入所有水体的优先物质清单，因此以前的基于分散液-液微萃取（DLLME）的测定海水中三嗪的方法已经过修改。主要变化在于使用串联质谱法代替二极管阵列作为检测技术。由于质谱检测器具有更高的灵敏度，因此减少了样品体积，并优化了萃取溶剂的体积。最佳提取条件是5 mL样品，50 µL 1-辛醇和搅拌步骤代替分散剂。获得的分析回收率（73％–101％，相对标准偏差低于4％）符合要求。定量极限（介于0.016和0.021 µg L ^-1之间）比特比灵的欧洲指令2013/39 / EU设定的限值（0.34 µg L ^-1）低10倍以上。拟议的方法用于测定来自ACoruña（西班牙西北部加利西亚）的海水样品中的目标化合物。