This study evaluates the eco-toxicity of biodegradable polymer materials in soil through a series of controlled mesocosm experiments using two indicator plant species: oat (Avena sativa) and red radish (Raphanus sativum). The polymers tested included polyethylene (PE), polystyrene (PS), Ecoflex, and cellulose, each applied at a 1% concentration by weight. Soil samples were collected at three time points—T0 (initial), T1 (35 days), and T2 (45 days)—to monitor changes in chemical, biochemical, and microbiological parameters. Key findings revealed significant differences in plant growth, enzyme activity, and soil properties across treatments. Notably, Raphanus exhibited greater sensitivity to polymer exposure, with pronounced variations in biomass, pH, electrical conductivity (EC), and heavy metal content compared to Avena. Statistical analysis confirmed that these parameters differed significantly from the control (T0) at T2, indicating substantial environmental impact.
The results demonstrated faster biodegradation of PE than PS, as evidenced by increased dehydrogenase activity and metabolic index values at T2. Dehydrogenase activity rose by 0.84 mg INTF/(kg·hr) above the average for Avena and 0.91 mg INTF/(kg·hr) for Raphanus, suggesting enhanced microbial metabolic activity driven by polymer degradation. Similarly, the metabolic index increased by 3.12 and 3.81 units respectively, reflecting improved energy metabolism in heterotrophic organisms. These changes indicate that biodegradation processes stimulate microbial communities and enhance nutrient cycling. Principal component analysis (PCA) further supported these observations, showing strong positive correlations between phosphatase activity and metabolic index, and between ammonium and protease activity, highlighting interconnected dynamics in carbon and nitrogen cycles.
Heavy metal concentrations declined significantly by T2, particularly in Raphanus treatments, suggesting that plant uptake plays a role in mitigating soil toxicity.THAP6 Antibody Epigenetics However, Cd levels remained elevated, indicating persistent contamination risks.163222-33-1 References The EC values also showed notable shifts, especially in Raphanus soils, where they increased significantly, pointing to potential osmotic stress.PMID:35060581 In contrast, Avena soils displayed reduced EC, possibly due to different root exudate profiles or microbial interactions. Overall, the data suggest that while biodegradable polymers offer environmental benefits, their degradation may produce intermediate phytotoxic compounds, particularly under conditions favoring rapid breakdown. Given its heightened sensitivity, Raphanus is recommended as a superior bioindicator for short-term eco-toxicological assessments in agricultural soils. This study underscores the importance of selecting appropriate indicator species and monitoring key biochemical markers when evaluating the environmental safety of biodegradable materials.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com
