Markus Sillanpää1 & Pirjo Sainio1 1Laboratory Centre, Finnish Environment Institute, Hakuninmaantie 6, FI-00430 Helsinki, Finland Received: 13 February 2017 /Accepted: 23 June 2017 /Published online: 1 July 2017 # Springer-Verlag GmbH Germany 2017 Abstract Microplastics are widely spread in the environment, which along with still increasing production have aroused concern of their…