Science Inventory

Comparison of Microplastic Isolation and Extraction Procedures from Marine Sediments

Citation:

Cashman, M., K. Ho, T. Boving, S. Russo, S. Robinson, AND R. Burgess. Comparison of Microplastic Isolation and Extraction Procedures from Marine Sediments. MARINE POLLUTION BULLETIN. Elsevier Science Ltd, New York, NY, 159:111507, (2020). https://doi.org/10.1016/j.marpolbul.2020.111507

Impact/Purpose:

This publication is intended for an audience interested in marine plastic pollution. This includes local, state, and federal agencies who have interest in microplastic research and policy. Microplastics are small plastic particles (<1mm). There is growing concern that microplastics accumulate in marine sediments, and that these particles may exhibit negative effects to the marine environment. This research is a method comparison study that looks at how different types of microplastics (i.e.- flakes, fibers, spheres) are recovered from sediments with different efficiencies depending on sediment and plastic type. These data will hopefully guide researchers in selecting appropriate methodology for extracting microplastics from sediments.

Description:

Microplastics (MPs) are small (<5 mm) plastic particles which pose a threat to marine ecosystems. Identifying MPs is crucial for understanding their fate and effects. Many MP extraction methods exist, but procedural differences prevent meaningful comparisons across datasets. This method comparison examines the efficiency of five methods for extracting MPs (40–710 μm) from marine sediments. Known quantities of MPs were spiked into sediments. The MPs were extracted and enumerated to demonstrate percent recovery. Findings determined that sediment matrix, MP properties, and extraction method affect the percent recovery of MPs from sediments. Average recoveries of spiked microplastics were between 0 and 87.4% and varied greatly by sediment type, microplastic, and method of extraction. In general, larger particle and lower density MPs were more effectively recovered. Marine sediments low in organic matter and with larger grain size also had higher percent recoveries of MPs. These findings support the need for method optimization and unified procedures.