Outdoor Atmospheric Micro‐/Nanomineral‐Mediated Organochlorine Pesticides in Sichuan Basin, China: Adsorption, Occurrence, and Risk Assessment.

This article focuses on the investigation of organochlorine pesticides (OCPs) and their interactions with atmospheric micro-/nanominerals in outdoor dustfall from the Chengdu–Deyang–Mianyang economic region in the Sichuan basin, China. Analysis of 53 dustfall samples revealed moderate concentrations of 24 OCPs, with higher levels in urban areas, and identified quartz, calcite, and gypsum as the primary minerals present. Spearman correlation and density functional theory simulations indicated that low-volatility OCPs, particularly p,p′-(dicofol+dichlorobenzophenone), are adsorbed by gypsum, suggesting commercial dicofol as a source distinct from DDT degradation. Risk assessment showed that while adult exposure to OCPs via dustfall is considered safe, children's cancer risk approaches the threshold under high dust ingestion scenarios, highlighting potential health concerns.