We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Macro and micro plastics sorb and desorb metals and act as a point source of trace metals to coastal ecosystems
AI summary Read the abstract
Researchers collected plastic debris from nine urban intertidal areas in Vancouver, Canada, and analyzed the metals sorbed onto different polymer types. They found that environmental plastics carried significantly higher metal concentrations than newly manufactured plastics, with zinc, copper, cadmium, and lead all detected. The study suggests that both macro and micro plastics act as point sources of trace metal contamination in coastal ecosystems.
Nine urban intertidal regions in Burrard Inlet, Vancouver, British Columbia, Canada, were sampled for plastic debris. Debris included macro and micro plastics and originated from a wide diversity of uses ranging from personal hygiene to solar cells. Debris was characterized for its polymer through standard physiochemical characteristics, then subject to a weak acid extraction to remove the metals, zinc, copper, cadmium and lead from the polymer. Recently manufactured low density polyethylene (LDPE), nylon, polyethylene terephthalate (PET), polypropylene (PP), polystyrene (PS) and polyvinyl chloride (PVC) were subject to the same extraction. Data was statistically analyzed by appropriate parametric and non-parametric tests when needed with significance set at P < 0.05. Polymers identified in field samples in order of abundance were; PVC (39), LDPE (28), PS (18), polyethylene (PE, 9), PP (8), nylon (8), high density polyethylene (HDPE, 7), polycarbonate (PC, 6), PET (6), polyurethane (PUR, 3) and polyoxymethylene (POM, 2). PVC and LDPE accounted for 46% of all samples. Field samples of PVC, HDPE and LDPE had significantly greater amounts of acid extracted copper and HDPE, LDPE and PUR significantly greater amounts of acid extracted zinc. PVC and LDPE had significantly greater amounts of acid extracted cadmium and PVC tended to have greater levels of acid extracted lead, significantly so for HDPE. Five of the collected items demonstrated extreme levels of acid extracted metal; greatest concentrations were 188, 6667, 698,000 and 930 μgg-1 of copper, zinc, lead and cadmium respectively recovered from an unidentified object comprised of PVC. Comparison of recently manufactured versus field samples indicated that recently manufactured samples had significantly greater amounts of acid extracted cadmium and zinc and field samples significantly greater amounts of acid extracted copper and lead which was primarily attributed to metal extracted from field samples of PVC. Plastic debris will affect metals within coastal ecosystems by; 1) providing a sorption site (copper and lead), notably for PVC 2) desorption from the plastic i.e., the "inherent" load (cadmium and zinc) and 3) serving as a point source of acute trace metal exposure to coastal ecosystems. All three mechanisms will put coastal ecosystems at risk to the toxic effects of these metals.
More Papers Like This
Sorption of trace metals by macro- and microplastics within intertidal sediments: Insights from a long-term field study within Burrard Inlet, British Columbia, Canada
AI summary Read the abstract
Researchers placed macro- and microplastics made of two common polymer types in marine intertidal sediments in British Columbia, Canada, for an extended field study to measure how they absorb trace metals. They found that metal sorption depended on polymer type, plastic aging, particle size, and local environmental conditions such as proximity to pollution sources. The study demonstrates that plastics in marine sediments can accumulate concerning levels of metals like copper and zinc, potentially creating concentrated toxic hotspots.
Correlation of metals and degraded marine (micro)plastic litter in geologically similar coastal areas with different anthropogenic characteristics
AI summary Read the abstract
Researchers assessed trace metal concentrations adsorbed on degraded marine microplastics collected from two Croatian Adriatic coastal sites -- an estuarine and an open coastal location -- finding that polystyrene adsorbed the highest metal loads in the order Zn > Pb approximately equal to Cu > Cd, with the more anthropogenically influenced estuary showing overall higher metal contamination on plastic debris.
Metals' Adsorption Onto Environmental Microplastics at Shoreline Sediments
AI summary Read the abstract
Metal adsorption onto microplastics collected from shoreline environments was measured, revealing that weathered plastic particles accumulate heavy metals like lead, copper, and zinc. The results confirm that shoreline microplastics act as metal-enriched vectors that could pose risks to organisms ingesting them.
Adsorption of Cadmium, Copper and Lead on Polypropylene and Polyethylene Microplastics
AI summary Read the abstract
This laboratory study measured how cadmium, copper, and lead adsorb onto polypropylene and polyethylene microplastic particles in seawater, finding that microplastics concentrate these toxic metals at levels well above surrounding water concentrations. The results reinforce concerns that microplastics act as carriers of heavy metal contamination in marine ecosystems.
Multi-metal competitive adsorption on plastic polymers: Evidence from single and binary metal exposure experiments.
AI summary Read the abstract
Researchers tested how eight heavy metals compete for binding sites on four common plastic polymers under controlled single- and binary-metal conditions, finding that polymer type and metal combinations both drive distinct adsorption patterns, while field-collected coastal plastic debris independently confirmed polymer-dependent metal accumulation in the environment.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.