Hello Microplastics Adventurers,
Thank you for collecting water samples with the Adventure Scientists’ Worldwide Microplastics project. Your efforts are helping us understand the distribution and concentration of microplastics in the world’s waters, while also building the largest microplastics dataset ever. Principal Investigator Abby Barrows has processed your microplastics samples, and we’re excited to share the results of your work!
First, let me briefly explain the process your samples go through in the lab. Once Abby receives your sample, she vacuum pumps each sample over a filter. After the filter has dried, Abby uses a microscope at 45x magnification to look for pieces of microplastic that are less than 5 millimeters. Moving along the grid lines, the filter is systematically counted, with each plastic piece categorized based on shape (round, microfiber, other) and color (blue, red, black, transparent/white, other). The final count for the sample is divided by the sample volume. This calculation helps to standardize the results, as incoming water samples are often not exactly one liter of water.
To date, 1705 of 2238 samples analyzed (76%) contained microplastics. 87% of marine samples contained plastic, while 49% of freshwater samples contained plastic. 24,516 pieces of microplastic have been counted. On average, we are finding 9 plastic pieces per liter of water. You can check out the number of pieces per liter in each individual sample on the map on our microplastics page.
Note: In the results listed here, we report the total microplastic pieces found in your sample. However, for many of our calculations and for the online map, we report the total pieces per liter. As such, your microplastic total on the map may appear different from your total below.
Also, please let us know if your sample isn’t located in the correct place on the map, so that we can fix it for you.
Missouri and Mississippi Rivers
Kris collected 13 samples, which contained one blue microfiber and one clear microfiber. Kris has extensive experience in conservation and is currently studying Natural Resources Management. He collected his samples while paddling the Missouri and Mississippi Rivers from Montana to the Gulf of Mexico.
Back River Expedition
Julie Fix and Seth Norell-Bader
Julie and Seth collected three freshwater samples, which didn't contain any microplastic. Julie is a currently studying chum salmon in the Puget Sound, and Seth is an environmental science educator. They collected their samples while paddling over 750 miles on the Back River.
Kirra Paulus and Gerrit Egnew
Kirra and Gerrit collected six samples, which contained one clear fragment and one red microfiber. Kirra and Gerrit first started collecting microplastics samples for Adventure Scientists by participating in the Gallatin Microplastics Initiative. They’ve since gone on two expeditions, so they could contribute to our Worldwide Microplastics Initiative. This trip, they collected samples while whitewater kayaking in Nepal. Stay tuned for a future Field Notes blog post about their experience!