The relative quantity of plastic film residues and other man-made materials in composts prepared from municipal solid wastes (MSW), biosolids, yard wastes, and pine bark was evaluated utilizing light and scanning electron microscopy equipped with energy dispersive X-ray analyzer. MSW composts screened through a 4 mm screen contained significant but highly variable quantities of plastic film residues and other man-made materials that escaped detection with the unaided eye. The other composts were free of such particles. We conclude that the database for evaluation of man-made materials in MSW composts is inadequate and must be developed further.
Krause, Charles R.; Horst, Leona E.; and Hoitink, Harry A. J.
"Morphological and Chemical Properties of Plastic Residues in Composts,"
Scanning Microscopy: Vol. 10
, Article 9.
Available at: https://digitalcommons.usu.edu/microscopy/vol10/iss4/9