Department of Chemistry, University of Lleida, Alcalde Rovira Roure 191, 25198 Lleida, Spain; Scientific Technical Services DATCEM, University of Lleida, Alcalde Rovira Roure 191, 25198 Lleida, Spain.
Department of Horticulture, Botany and Gardening, University of Lleida, Alcalde Rovira Roure 191, 25198 Lleida, Spain.
Sci Total Environ. 2017 Feb 15;580:1530-1538. doi: 10.1016/j.scitotenv.2016.12.139. Epub 2016 Dec 29.
Pesticide remains contained in agrochemical packaging waste are a source of uncontrolled risk for human health; they are also a quality feedstock for the plastic recycling industry. Many governments have recently started to establish laws and regulations to develop systems for recovering and recycling the polymeric packages used for pesticides. There is also a demand in having a procedure to control the suitability of the pesticide packages to be reused. We have developed a two-step operation process to assess the pesticide residues in agricultural containers made of a variety of polymeric matrices. The procedure is based on an extraction with a solvent mixture followed by UPLC-MS/MS determination. Solvents for neutral pesticides were selected considering the Hildebrand solubility (δ) of solvents and polymers together with those estimated for the pesticides. The proposed technique is effective in recovering imbibed pesticides in polymeric matrices. Also, a simplified extraction procedure has been tested to become a routine method for these wastes. We have found that in many cases a significant amount of pesticides remain into the polymeric matrix, even after a standardized cleaning; the impact of releasing these hazardous compounds into the environment is to be of further consideration.
农药残留包含在农用化学品包装废物中，是对人类健康造成不可控风险的一个来源；它们也是塑料回收行业的优质原料。最近，许多政府已经开始制定法律法规，建立回收和再循环农药用聚合物包装的系统。人们还要求有一个程序来控制可重复使用的农药包装的适用性。我们已经开发了一个两步操作过程来评估由各种聚合物基质制成的农用容器中的农药残留。该程序基于用溶剂混合物进行提取，然后进行 UPLC-MS/MS 测定。考虑到溶剂和聚合物的 Hildebrand 溶解度（δ）以及估算的农药溶解度，选择了用于中性农药的溶剂。该方法在回收聚合物基质中吸收的农药方面非常有效。此外，还测试了一种简化的提取程序，以使其成为这些废物的常规方法。我们发现，在许多情况下，即使经过标准化清洗，仍有大量的农药残留在聚合物基质中；将这些危险化合物释放到环境中所产生的影响需要进一步考虑。
