Study of photocatalytic Degradation of Mancozeb and chlorpyrifos methyl under intense Ultraviolet Light over different time period

Mancozeb, an ethylene bis-dithiocarbamate (EBDC) fungicide, has been used for the management of fungal pathogens all over the world in major agricultural crops for over five decades. Its popularity is mainly associated to its multi-site action mechanism, its low cost and its capacity to prevent resistance of pathogenic fungi to its use [1]. Despite the continued use of this class, the increased concern with the environmental persistence, degradation products and toxicity of this class has stimulated a great deal of scientific and regulatory interest. All this understanding is important in realizing the agronomic value balanced to the possible ecological and human health risks. The chemical degradation patterns of mancozeb are of special interest because of the production of ethylenethiourea (ETU), a toxic metabolite which is well known for its carcinogenic and teratogenic properties [2], [9]. Oxidation reaction Studies investigating oxidation reactions, such as oxidation in the presence of ozone and chlorine dioxide, have found several oxidation degradation products - which raise additional concerns in toxicology [2]. Environmental variables also influence the stability of mancozeb; for example, formulation type and adjuvants have a significant effect on rainfastness on the crop foliage and influence residue levels and resulting environmental contamination [3].