Abstract：
Microplastics are widespread in facility strawberry greenhouses and can be deposited on the surface of strawberries through air currents. Investigating effective cleaning methods represents a viable strategy to reduce human ingestion of MPs. Therefore, different cleaning methods were compared: ultrasonic cleaning for 30 min, deionized water rinsing once, deionized water immersion for 30 min, and fruit immersion in washing salt for 30 min. The MPs in strawberry washing water were analyzed and compared using laser direct infrared imaging to investigate their characteristics and the optimal reduction of MPs on the surface of strawberries. The quality of the cleaning results was in the following order: water immersion > washing salt immersion > water rinsing > ultrasound. Water immersion was 1.3-2 times more effective in removing microplastics than other treatments. Furthermore, 21 polymer types were detected in the samples. Most MPs were less than 50 µm in size. The main polymers in this size range were polyamide, chlorinated polyethylene, and polyethylene terephthalate, and they mainly existed as fragments, fibers, and beads. This study provides a valuable reference for reducing human intake of microplastics through fresh fruits and vegetables.
摘要：
微塑料在设施草莓温室中广泛存在，可以通过气流沉积在草莓表面。研究有效的清洁方法代表了减少人类摄入MP的可行策略。因此,比较了不同的清洗方法:超声波清洗30分钟,去离子水冲洗一次，去离子水浸泡30分钟，和水果浸入洗涤盐30分钟。利用激光直接红外成像技术对草莓洗涤水中的MPs进行了分析和比较，以研究其特征和草莓表面MPs的最佳减少。清洁结果的质量顺序为:水浸>洗涤盐浸>水冲洗>超声。水浸在去除微塑料方面的效果是其他处理的1.3-2倍。此外，在样品中检测到21种聚合物类型。大多数国会议员的大小小于50µm。这个尺寸范围内的主要聚合物是聚酰胺，氯化聚乙烯,和聚对苯二甲酸乙二醇酯，它们主要以碎片的形式存在，纤维，和珠子。该研究为减少人体通过新鲜水果和蔬菜摄入微塑料提供了有价值的参考。
