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How do polyhydroxyalkanoates aged by aerobic compost interact with steroidal estrogens to alter their adsorption and transport characteristics? Kinetics, isotherms, and influencing factors
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Researchers studied how biodegradable polyhydroxyalkanoate microplastics aged through composting interact with estrogen hormones in the environment. They found that compost-aged particles had significantly higher capacity to absorb estrogens than fresh ones, and that the hormones were readily released when exposed to conditions simulating bird digestion. The study suggests that aged biodegradable microplastics in compost-treated soils could act as carriers that increase the spread and bioavailability of hormone pollutants.
Despite evidence indicating a substantial presence of microplastics (MPs) in organic fertilizers, research exploring the differences of MPs among various types of organic fertilizers remains limited. Additionally, MPs can act as carriers for organic pollutants, influencing their environmental behaviors. This study investigated the presence of MPs in organic fertilizers and their effects on the environmental behaviors of steroidal estrogens. We compared the adsorption of estrone (E1) and estrone sulfate sodium (E1-3S) by original PHA and PHA aged through cattle manure-straw compost (CS) and vermicompost (VC). PHA-CS exhibited the highest adsorption capacities for E1 (47.97 ± 2.20 μg g) and E1-3S (64.32 ± 2.09 μg g). Dissolved organic matter (DOM) from CS and VC profoundly affected estrogen adsorption onto PHA, with VC-derived DOM inhibiting and CS-derived DOM promoting adsorption. In simulated avian digestive fluid, the desorption efficiency of E1 was 72.46 %-93.43 % higher than that of E1-3S, indicating increased toxicity and bioavailability of E1 upon bird ingestion. Transport experiments strongly suggested that estrogens could be more easily retained in porous media containing aged PHA. This study advances our understanding of the adsorption mechanisms of aerobic compost-derived PHA on estrogens and their desorption behaviors under different environmental conditions.
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This study investigated the sorption of the hormone 17β-estradiol onto polyethylene terephthalate and polyethylene microplastics, examining how particle size and aging affect sorption capacity and co-exposure toxicity. Smaller and aged MPs showed higher estrogen sorption, increasing the potential for MPs to act as vectors for hormonal contaminants in aquatic environments.
Effects of polyethylene microplastics occurrence on estrogens degradation in soil
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Researchers investigated how polyethylene microplastics influence the degradation of six common estrogens including estrone, 17alpha-estradiol, 17beta-estradiol, estriol, diethylstilbestrol, and 17alpha-ethinylestradiol in soil environments. They found that polyethylene microplastic presence differentially affected estrogen degradation rates, suggesting that microplastics modulate endocrine-disrupting compound persistence in agricultural soils.
Adsorption and Desorption of Steroid Hormones by Microplastics in Seawater
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Researchers evaluated the adsorption and desorption of the steroid hormones 17β-estradiol (E2) and 17α-ethynylestradiol (EE2) onto microplastics in seawater, finding that polymer type, particle size, salinity, pH, and humic acid concentration all influenced sorption behavior. The study provides mechanistic data relevant to assessing microplastics as vectors for endocrine-disrupting compounds in marine environments.
Hydrophobic sorption behaviors of 17β-Estradiol on environmental microplastics
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Researchers studied the sorption behavior of the estrogen 17beta-estradiol onto five types of microplastics in marine water, finding hydrophobic interactions dominated and that microplastics could serve as vectors concentrating this endocrine disruptor.
Influence of microplastics occurrence on the adsorption of 17β-estradiol in soil
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Researchers investigated how the presence of microplastics in soil affects the adsorption behavior of the hormone 17-beta-estradiol. The study found that common greenhouse soil microplastics including polyethylene, polyvinyl chloride, and polystyrene influenced how estrogen compounds bind to soil, suggesting that microplastic contamination may alter the environmental fate of hormonal pollutants.
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