The desorption rate of heavy metals on the surface of microplastics is high after being eaten by animals

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 The desorption rate of heavy metals on the surface of microplastics is high after being eaten by animals


The influence of micro plastics (MPS) on human beings has been paid more and more attention. It is a kind of plastic fragment or particle with particle size less than 5mm, which widely exists in water and land environment and can be used as carrier of various toxic pollutants (such as metal ions). Microplastics can be directly or indirectly ingested into the body and transported and enriched in the food chain, which poses a threat to ecosystem function and human health.

The surface of microplastics often adsorbs heavy metals and other pollutants, and becomes the carrier of other pollutants into the organism. Due to the presence of intestinal surfactants, these heavy metals adsorbed on the surface of microplastics are easily desorbed in organisms, which may lead to higher ecological risk.

Recently, the research team of Wuhan Botanical Garden of Chinese Academy of Sciences published a study in the academic journal water research, entitled adsorption mechanism of calcium micro plastics and their desorption behavior in edition and gutenv ironments:TherolesofwaterpH ,leadions,naturalorganicmatterandphenanthreneu201du3002 Zhou Yanfei, a doctoral student from Wuhan Botanical Garden, Chinese Academy of Sciences, is the first author of the study, and Liu Wenzhi, a researcher, is the corresponding author of the paper.

On the basis of the previous work on the toxicity of micro plastics to earthworms, the research team further studied the adsorption capacity of micro plastics (PA, PVC, PS, ABS and PET) to cadmium (II) and the desorption behavior of cadmium in different environmental media.

The results showed that the adsorption capacity of polyamide microplastics (PA) for cadmium was the highest (1.70 u00b1 0.04mg/g), followed by polyvinyl chloride (PVC) of 1.04 u00b1 0.03mg/g, polystyrene (PS) of 0.76 u00b1 0.02mg/g, acrylonitrile butadiene styrene (ABS) of 0.65 u00b1 0.02mg/g, and polyethylene terephthalate (PET) of 0.25 u00b1 0.01mg/g. It was also found that the adsorption capacity of microplastics to cadmium was affected by pH, humic acid and other heavy metal ions (such as lead concentration). The presence of humic acid in water can promote the desorption of cadmium from the surface of microplastics. The desorption rate of cadmium in animal intestine is 36.9% - 59.9%, which is much higher than that of 6.9% - 18.7% in sediment environment. The team pointed out that the study showed that there was a high desorption rate and ecological risk of heavy metal pollutants on the surface of microplastics in the natural environment after being eaten by animals. In general, the study will help to better understand the adsorption mechanism of cadmium on microplastics and the desorption behavior of cadmium in aquatic ecosystems under different environmental conditions. Extended reading of Microsofts statement implies no responsibility for interruption of supply? This agreement has long been in the U.S. media: tiktok will sue the trump government in the United States as soon as possible on the 11th, attracting the company to sell chips to Huawei. Source: surging news editor: Wang Fengzhi_ NT2541

The results showed that the adsorption capacity of polyamide microplastics (PA) for cadmium was the highest (1.70 u00b1 0.04mg/g), followed by polyvinyl chloride (PVC) of 1.04 u00b1 0.03mg/g, polystyrene (PS) of 0.76 u00b1 0.02mg/g, acrylonitrile butadiene styrene (ABS) of 0.65 u00b1 0.02mg/g, and polyethylene terephthalate (PET) of 0.25 u00b1 0.01mg/g.

It was also found that the adsorption capacity of microplastics to cadmium was affected by pH, humic acid and other heavy metal ions (such as lead concentration). The presence of humic acid in water can promote the desorption of cadmium from the surface of microplastics. The desorption rate of cadmium in animal intestine is 36.9% - 59.9%, which is much higher than that of 6.9% - 18.7% in sediment environment.