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The Topolnitsa River basin is a vulnerable agricultural area affected by mining and metallurgical pressure. Irrigation with surface waters and contrasting soil properties may increase secondary contamination. This study develops the Chemical Line of Evidence (Chem-LoE) within the TRIAD framework of an advisory system for ecological risk assessment. The focus is on riparian and floodplain agricultural soils, mainly alluvial-meadow and deluvial-meadow soils. Copper (Cu), lead (Pb), zinc (Zn), cadmium (Cd) and arseni...