农膜老化前后添加剂组成变化及产物非靶向识别

Changes in additive composition and non-targeted screening of products in agricultural plastic films on aging

中文关键词: 非靶向筛查  分级鉴定  塑料添加剂  老化  农膜  迁移

英文关键词: Non-targeted screening  tiered identification  plastic additives  aging  agricultural films  migration

中文摘要:

      为揭示聚烯烃（PO）农膜老化对有机污染物谱的潜在影响，采用液相色谱-质谱（LC-MS）非靶向筛查技术对原始及光老化PO膜进行分级鉴定与差异分析。共获得86个L2置信度的候选化合物，其中原膜79个、老化膜46个，二者共有39个；以正离子模式检出为主。这些候选物主要归属邻苯二甲酸酯类增塑剂及其代谢物、表面活性剂、季铵盐、酰胺类滑爽剂及紫外吸收剂/抗氧化剂等稳定剂。老化后，检出化合物的数量与类别组成明显改变，表明老化过程可能促进膜中添加剂的迁移、释放与转化。研究结果为评估农膜老化过程中添加剂的释放、转化行为及其潜在风险提供了理论依据。

英文摘要:

      To reveal the potential impact of polyolefin (PO) agricultural film aging on the organic contaminant profile, non-targeted screening by liquid chromatography–mass spectrometry (LC-MS) was employed for tiered identification and comparative analysis of pristine and photo-aged PO films. A total of 86 candidate compounds at L2 confidence level were obtained, comprising 79 in the pristine films, 46 in the aged films, and 39 shared. The majority were detected in positive ion mode. These candidates were primarily attributed to phthalate plasticizers and their metabolites, surfactants, quaternary ammonium compounds, amide slip agents, and stabilizers such as UV absorbers/antioxidants. Significant alterations were observed in both the number and category composition of detected compounds after aging, suggesting that aging may facilitate additive migration/release and transformation. These findings provide a basis for assessing the release and transformation behavior of additives during agricultural film aging and their associated potential risks.