Breakdown and Modification of Microplastic Beads by Aeolian Abrasion.
Breakdown and Modification of Microplastic Beads by Aeolian Abrasion.
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DOI：
10.1021/acs.est.2c05396
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发表时间：
2023-01-10
影响因子：
11.4
通讯作者：
Fowler, Shaun
中科院分区：
文献类型：
--
作者：
Bullard, Joanna E.;Zhou, Zhaoxia;Davis, Sam;Fowler, Shaun
跃迁是一种重要的风蚀过程，它可以通过风蚀引起颗粒的改变和破碎。人们认识到微塑料颗粒可以通过风传播，但脉动对微塑料性能的影响尚不清楚。本研究考察了石英颗粒对球形微塑料珠的大小、形状和表面特性的模拟跳跃的影响。在240-300小时的磨损过程中，微塑料的直径减小了30-50%，质量损失约为80%。对于长达200小时的磨损周期，微塑料珠保持球形，整体形状变化最小。在磨损过程中，从微珠表面脱落的塑料碎片95%以上直径≤10 μm。此外，在磨损过程中，石英颗粒破碎产生的细颗粒附着在微珠表面，导致颗粒表面检测到的碳减少和硅增加。结果表明，微塑料可能在风沙跳跃过程中被机械分解，产生的小碎片具有长距离运输的潜力，并且在人体呼吸的大小范围内。关于风蚀过程中微塑性破坏的研究很少。本研究报告了沙对微球的风蚀磨损的实验室模拟，其对微塑性表面化学和呼吸健康的影响。
Saltation is an important wind erosion process that can cause the modification and breakdown of particles by aeolian abrasion. It is recognized that microplastic particles can be transported by wind, but the effect of saltation on microplastic properties is unknown. This study examined the impact of simulated saltation alongside quartz grains on the size, shape, and surface properties of spherical microplastic beads. The diameter of the microplastics was reduced by 30–50% over 240–300 h of abrasion with a mass loss of c. 80%. For abrasion periods up to 200 h, the microplastic beads remained spherical with minimal change to overall shape. Over 95% of the fragments of plastic removed from the surface of the microbeads during the abrasion process had a diameter of ≤10 μm. In addition, during the abrasion process, fine particles derived from breakdown of the quartz grains became attached to the surfaces of the microbeads resulting in a reduction in carbon and an increase in silicon detected on the particle surface. The results suggest that microplastics may be mechanically broken down during aeolian saltation and small fragments produced have the potential for long distance transport as well as being within the size range for human respiration. Minimal research exists on microplastic breakdown during wind erosion. This study reports laboratory simulations of the aeolian abrasion of microspheres by sand with implications for microplastic surface chemistry and respiratory health.
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影响因子：
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作者：
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通讯作者：
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通讯作者：
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