Occurrence, Toxicodynamics, and Mechanistic Insights for Atrazine Degradation in the Environment

Abstract

Atrazine, a herbicide used for controlling broadleaf weeds, has been one of the predominant pollutants constituting 80–90% of detection frequency in the samples collected from rivers, estuaries, oceans, sediments, agricultural lands, and crops. The fate of atrazine is highly unpredictable depending on the physio-chemical, physiological and geographical conditions. Range of metabolites such as deethylatrazine (DEA), deisopropyl atrazine (DIA), and didealkylatrzine (DDA) are formed as a result of biotic as well as abiotic degradation process in the environment following cyanuric acid, ammelide, CO₂ and NH₃ are formed as final products. Atrazine degraded products has shown more hazardous nature than the parent compound, atrazine. Atrazine is banned in Italy, India, Germany and European union but widely used in China, Australian, Canadian and US agriculture. To date, reviews evaluating the assimilation of synerigistic treatment technologies and comparative degration mechanism have not been highlighted. This work focuses on (1) the spatiotemporal distribution of atrazine and its metabolites globally and the factors governing it (2) provides an in-depth discussion about the various studies showing the toxicity of atrazine in microbes, cattle, human, terrestrial and aquatic organisms; (3) discusses the contaminants of emerging concern which are continuously replacing atrazine like terbuthylazine and their intermediate compounds posing more risk to wildlife and humans; (4) summarises the different treatment technologies which have been predominantly applied for the removal of atrazine in water and soil systems and also discusses the synergistic or mutualistic aspects of treatment methods in degrading atrazine.