Fig. 6From: Occurrence of drug target residues within decantation tank sediments: a good clue to assess their historical excretion?Principal component analysis performed with the sum of the concentrations of cationic (∑Cat.), anionic (∑Ani.) and neutral (∑Neu.) DTRs and the grain size (> 1 mm, 0.2 < 1 mm, 50 < 200 μm and < 50 μm respectively) and the total organic carbon (TOC)Back to article page