This work examines polycyclic aromatic hydrocarbon (PAH) concentrations in yard trash at various stages of the yard trash management cycle of collection, stockpiling, grinding and screening into mulch, and composting. Total extractable PAH concentrations were measured in yard trash at various management stages from 10 locations in Florida. The concentrations of 16 PAH compounds in processed yard trash ranged from 0.38 to 14 mg kg-1. PAH concentrations were detected in vegetative material harvested from a residential neighborhood, but were below the United States Environmental Protection Agency residential regional screening levels (RSLs). PAH concentrations near or above the RSLs were common in both unprocessed and processed yard trash collected at waste management facilities. PAH concentrations were amongst the highest in newly ground yard trash samples and were amongst the lowest in composted yard trash samples. These findings are important because land application of some waste materials, such as construction and demolition debris fines and street sweepings, are sometimes limited due to PAH. If processed yard trash, which is commonly land applied in residential settings, possesses similar PAH concentrations, evaluation of current risk assessment practices for land-applied wastes may require further examination.

中文翻译：

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处理后的庭院垃圾中的多环芳烃

这项工作检查了庭院垃圾在收集、储存、研磨和筛选成覆盖物以及堆肥的各个阶段的庭院垃圾中的多环芳烃 (PAH) 浓度。在佛罗里达州 10 个地点的不同管理阶段，测量了庭院垃圾中的总可提取 PAH 浓度。处理过的庭院垃圾中 16 种 PAH 化合物的浓度范围为 0.38 至 14 mg kg-1。在从居民区采集的植物材料中检测到 PAH 浓度，但低于美国环境保护署住宅区域筛选水平 (RSL)。PAH 浓度接近或高于 RSL，在废物管理设施收集的未处理和处理过的庭院垃圾中很常见。PAH 浓度在新磨碎的庭院垃圾样本中最高，在堆肥后的庭院垃圾样本中最低。这些发现很重要，因为某些废物的土地应用，例如建筑和拆除碎片的罚款以及街道清扫，有时会因 PAH 而受到限制。如果处理后的庭院垃圾（通常用于住宅环境的土地）具有相似的 PAH 浓度，则可能需要进一步检查对当前土地应用废物的风险评估做法的评估。