Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, Canada.
Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, Canada.
Environ Toxicol Pharmacol. 2023 Aug;101:104195. doi: 10.1016/j.etap.2023.104195. Epub 2023 Jun 21.
There is concern that microplastics can act as a vector for cadmium through adsorption and desorption of free-ionic cadmium. Little is known about the uptake of cadmium following ingestion of cadmium-microplastic complexes. This study used an in vitro gut sac technique to investigate the translocation of cadmium across the gut barrier of fathead minnows following the simulated ingestion of cadmium, microplastics, or their complexed mixture. Microplastics did not cross the gut membrane, nor did microplastics alter the rate of cadmium translocation, which was estimated to be 1.2 ± 0.04 ng Cd / hour. Less cadmium translocated when cadmium-microplastic complexes were injected than the equivalent dose of only cadmium, indicating that the presence of microplastics was protective of dietary cadmium uptake. This work highlights the importance of considering dietary uptake and the role of microplastics acting as a vector for cadmium in aquatic environments and stresses the need to understand how environmental (digestive or ambient) characteristics govern cadmium-microplastic interactions.
人们担心微塑料可以通过自由离子镉的吸附和解吸作用作为镉的载体。对于摄入镉-微塑料复合物后镉的吸收情况知之甚少。本研究使用体外肠囊技术，模拟摄入镉、微塑料或其复合物混合物后，研究镉在食蚊鱼肠道屏障中的跨膜转移。微塑料不能穿过肠膜，微塑料也不能改变镉的转移速率，估计为 1.2±0.04ng Cd/小时。当注射镉-微塑料复合物时，转移的镉量少于仅注射镉的等效剂量，这表明微塑料的存在对膳食镉的吸收具有保护作用。这项工作强调了在水生环境中考虑饮食摄入和微塑料作为镉载体的作用的重要性，并强调需要了解环境（消化或环境）特征如何控制镉-微塑料相互作用。
