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This chemical element occurs naturally in water, soil and rocks. It is also present in fossil fuels, fertilizers, agricultural pesticides and food (rice and seafood). Arsenic may be present in these samples in the organic chemical form (methylated, arsenobetaine, arsenolipids and arsenic sugars) considered less toxic and in the inorganic chemical form (+3 and +5 oxidation states), being As3+ considered to be the most toxic arsenic compound. Its toxic effects include skin lesions, damage to the central nervous system and to its development, cardiovascular diseases, diabetes and cancer.