Chemical characterization of organic microcontaminant sources and biological effects in riverine sediments impacted by urban sewage and pulp mill discharges

► Forty-five organic microcontaminants were identified in seven sediment samples from Biobío River. ► A PCA study was conducted. ► Domestic wastewater and Kraft pulp mills were the most important factors. ► Domestic wastewater impact presents the highest estrogenic and dioxin-like activities.