UHPLC-QTOF-MS applied for screening of organic contamination of rivers in Macedonia.
Vardar basin rivers (Kriva, Zletovska, Bregalnica, Vardar) included in the study.
the highest herbicide levels found in Bregalnica related to rice cultivation.
the highest drug levels found in Vardar, downstream of Skopje, capital of Macedonia.
large contribution to database on organic contamination of freshwaters worldwide.