The strong affinity for adsorption to soil particles and organic matter is one of the major advantages in introducing paraquat as a herbicide because it limits its bioavailability to plants and microorganisms. Moreover, paraquat is not mobile in most soils and the portion that does not become associated with soil particles can be decomposed to a non-toxic product by soil bacteria; thus, paraquat does not present a high risk of groundwater contamination. Ultraviolet light, sunlight and soil microorganisms can degrade paraquat to products that are less toxic than the parent compound. However, paraquat has been demonstrated to be a highly toxic compound for humans and animals and many cases of acute poisoning and death have been reported over the past few decades The high mortality rate observed following paraquat exposure has been attributed to the lack of an antidote or effective treatment to ameliorate the toxic effects of the poison. Recognizing that paraquat induces its toxic effects mainly via oxidative stress-induced mechanisms, researchers and clinicians have placed great emphasis on the use of antioxidants as a treatment modality for paraquat toxicity