OK, thanks for the correction on the difference between microplastics and nanoplastics. Now I can understand why increasing advocacy is directed toward microplastics, since any regulation thereof will affect suppliers of plastic resins as raw material and not only the responsible disposal of finished products. It appears from the illustration in the linked story that a lot of the microplastic cargo is washing ashore (being less dense than salt water or sand) and is being collected in yellow bags. I doubt recovery of the 25 tons of nitric acid or marine fuel will be as convenient.