During the 2020-21 olive oil campaign, the contribution of harvesting operations to mineral oil saturated (MOSH) and aromatic hydrocarbon (MOAH) contamination was studied. Oils extracted from hand-picked olives (15 different olive groves) generally had background MOSH (<2.7 mg/kg), and no quantifiable MOAH. In 40% of the cases, an important contamination increase was observed after harvesting operations. Except for one sample (325.8 and 111.0 mg/kg of MOSH and MOAH, respectively), other samples reached 4.3-33.7 mg/kg of MOSH and 1.1-11.3 mg/kg of MOAH. Accidental leaks of lubricants and/or contact with lubricated mechanical parts, were identified as important sources of contamination. Chromatographic traces obtained by on-line high-performance liquid chromatography (HPLC)- gas chromatography (GC)- flame ionization detection (FID) allowed for source identification. A comprehensive two-dimensional gas chromatographic platform (GC×GC) with parallel FID/MS detection was implemented for confirmation and to attempt the characterization of the contaminations. Good harvesting practices are suggested to minimize contamination risks.

在 2020-21 橄榄油运动期间，研究了采收作业对饱和矿物油 (MOSH) 和芳香烃 (MOAH) 污染的影响。从手工采摘的橄榄（15 个不同的橄榄园）中提取的油通常具有背景 MOSH（<2.7 毫克/千克），并且没有可量化的 MOAH。在 40% 的案例中，收获作业后观察到污染显着增加。除一个样品（MOSH和MOAH分别为325.8和111.0 mg/kg）外，其他样品MOSH达到4.3-33.7 mg/kg，MOAH达到1.1-11.3 mg/kg。润滑剂的意外泄漏和/或与润滑机械部件的接触被确定为重要的污染源。通过在线高效液相色谱 (HPLC)-气相色谱 (GC)-火焰离子化检测 (FID) 获得的色谱图可用于来源鉴定。采用具有并行 FID/MS 检测功能的综合二维气相色谱平台 (GC×GC) 进行确认，并尝试对污染物进行表征。建议采取良好的采收做法，以尽量减少污染风险。