Fig. 2From: Cationic polyacrylamide copolymers (PAMs): environmental half life determination in sludge-treated soilLysimeter-extract at test start and test end with standard retention times. Vertical lines = retention time of molecular weight reference standards: red: SaSt140317-AS (300,000 Da), 13.8 min; blue: SaSt140317-BS (92,000 Da), 15.2 min; green: SaSt140317-CS (24,000 Da), 16.4 minBack to article page