Mutual Effects and Uptake of Organic Contaminants and Nanoplastics by Lettuce in Co-Exposure

IF 2.3 Q1 AGRICULTURE, MULTIDISCIPLINARY ACS agricultural science & technology Pub Date : 2024-03-26 DOI:10.1021/acsagscitech.3c00600
Michael Taylor Bryant, Jianhong Ren, Virender K. Sharma and Xingmao Ma*, 
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Abstract

Organic contaminants, such as pesticides and pharmaceuticals, are commonly found in agricultural systems. With the growing use of plastic products, micro- and nanoplastics (MNPs) are increasingly detected in these agricultural systems, necessitating research into their interactions and joint effects to truly understand their impact. Unfortunately, while there has been a long history of research into the uptake of organic pollutants by plants, similar research with MNPs is only beginning, and studies on their mutual effects and plant uptake are extremely rare. In this study, we examined the effects of three agriculturally relevant organic pollutants with distinctive hydrophobicity as measured by log KOW (trimethoprim: 0.91, atrazine: 2.61, and ibuprofen: 3.97) and 500 nm polystyrene nanoplastics on their uptake and accumulation by lettuce at two different salinity levels. Our results showed that nanoplastics increased the shoot concentration of ibuprofen by 77.4 and 309% in nonsaline and saline conditions, respectively. Alternatively, organic co-contaminants slightly lowered the PS NPs uptake in lettuce with a more pronounced decrease in saline water. These results underscore the impactful interactions of hydrophobic organic pollutants and increasing MNPs on a dynamic global environment.

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有机污染物和纳米塑料共同暴露时的相互影响和生菜对它们的吸收
有机污染物(如杀虫剂和药物)通常存在于农业系统中。随着塑料产品的使用越来越多,在这些农业系统中检测到的微塑料和纳米塑料(MNPs)也越来越多,因此有必要对它们之间的相互作用和共同效应进行研究,以真正了解它们的影响。遗憾的是,虽然对植物吸收有机污染物的研究由来已久,但对 MNPs 的类似研究才刚刚开始,有关其相互影响和植物吸收的研究极为罕见。在这项研究中,我们考察了三种与农业相关的有机污染物(三甲氧苄啶:0.91;阿特拉津:2.61;布洛芬:3.97)的疏水性对数 KOW,以及 500 纳米聚苯乙烯纳米塑料在两种不同盐度水平下对莴苣吸收和积累的影响。结果表明,在非盐度和盐度条件下,纳米塑料使布洛芬的芽浓度分别增加了 77.4% 和 309%。另外,有机共污染物也略微降低了莴苣对 PS NPs 的吸收,在盐水中的降低更为明显。这些结果凸显了疏水性有机污染物与不断增加的 MNPs 之间的相互作用对全球动态环境的影响。
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