All organic P and LMWOA analyses were performed by IC (Dionex BIO LC). The system included a mobile phase degassing module with helium sparging (EDM-2), a gradient pump, a conductivity detector, an anion micro-membrane suppressor (AMMS-300), an autosampler (ICS) and a sample injector (MX9900-000). Organic P compounds and LMWOAs were separated in an AS11 column (4 × 250 mm) equipped with an AG11 Guard Column (4 × 50 mm). Data acquisition was performed using Dionex BioLC system connected to a computer via an interface box (Agilent SS420x). The IC chromatograms were analysed using ChromQuest 4.0 SP1.