We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Potential Pollution by Biodegradable Waste: Assessing the Degradability of Oxo-degradable, Compostable, and Biodegradable Products Under Laboratory Conditions
Summary
Labels like "biodegradable" and "compostable" don't always mean what you think: in this lab study, some so-called biodegradable products (like an oxo-degradable garbage bag) actually got tougher over time instead of breaking down, showing little real chemical change even after months of simulated real-world exposure. This matters because these products may linger in the environment far longer than advertised, potentially breaking into microplastics that can enter waterways, soil, and eventually our food and bodies—so the eco-friendly label on a product isn't a guarantee it will actually disappear safely.
This study evaluated the degradability of three products, namely an oxo-degradable garbage bag (GB), compostable lunch sheet (LS), and biodegradable salad plate (SP), under four controlled laboratory simulations representing natural environmental conditions: freshwater body (FW), riverbank (RS), landfill (COM), and direct ultraviolet (UV) light exposure. Degradation was assessed over time by monitoring the monthly changes in weight. Mechanical and chemical changes were monitored using tensile strength testing and Fourier-transform infrared (FT-IR) spectroscopy, respectively. Among the tested products, SP exhibited the highest mean percentage weight loss (43.76±3.34 to 100%) under RS conditions. Instead of weakening, GB exhibited increased mean tensile strength at break and mean elongation at break under RS (7.25±0.29 and 317.78±9.15, respectively) and COM (4.35±0.88 and 46.16±28.11, respectively), suggesting possible crosslinking or physical aging rather than degradation. No loss of characteristic peaks indicating biodegradation of the polymer material was observed in SP under FW and UV exposure, LS under UV exposure, and GB under FW, RS, or COM exposure. The findings highlight that degradation rates vary substantially across different environmental media and sample types. The potential contribution of certain biodegradable materials, particularly oxo low-density polyethylene (oxo-LDPE), to long-term plastic pollution is emphasized in this study.