• Mercury ecotoxicology highlights a cycle from environmental mercury presence to bioaccumulation, with methylation by aquatic organisms and dietary methylmercury exposure; selenium interactions modulate toxicity, indicating nutrient–metal co-regulation in risk [6], [7], [20].

• Persistent organochlorines demonstrate decade-spanning persistence and cross-media transport, with PCB congeners and organochlorine pesticides detected in air, rainwater, water, and biota, illustrating sources, fate, and accumulation pathways [1], [2], [3], [4], [8], [9], [10], [11].

• Methodologies in ecotoxicology emphasize standardized bioassays and toxic endpoint assessment, including acute fish bioassays, metal toxicity in crustaceans, and behavioral endpoints for heavy metals, shaping hazard ranking and mechanistic interpretation [12], [14], [16], [17], [18].

• Human exposure and health implications emerge from environmental contaminants through biomonitoring and epidemiology papers, showing body burden in humans and cautionary health outcomes linked to chlorinated pesticides and lead exposures [12], [15], [19].

• Data on pesticide solubility, environmental partitioning, and chemical persistence inform risk assessment and regulatory science, with comprehensive solubility datasets, DDT persistence in ponds, and environmental pesticide inventories guiding exposure modeling [9], [11], [13].