1. Introduction. Molybdenum is an essential trace element for human, animal and plant health. It acts as a cofactor for the functioning of a large number of enzymes which alyse chemical reactions involved in the cycling of N, C, and S (Mendel, 2007, Schwarz et al., 2009).Yet, as with all elements, exposure to high doses of Mo can be detrimental to plant and animal health, including human