Fig. 2
From: Microplastic extraction protocols can impact the polymer structure
Investigated matrix digestion protocols applied to concentrated sewage sludge. Both protocols are able to affect the sludge (increasing brightness/foam formation of solution during the reaction process). However, in both cases oxidation residue remains after the reaction. Less residue remains after Basic Piranha oxidation. In contrast to the ferrous Fenton residue, the Basic Piranha residue does not disturb further analytics like GPC