For incubation with soil, in order to sustain growth of Desulfovibrio genus Lactate sulfate media specific for the growth of Desulfovibrio genus was used for incubation. Incubation was done for 1 month (Suzuki et al., 2003). Desulfovibrio vulgaris subsp. vulgaris was used for incubation of samples (Spear et al., 2000). Solid-phase extraction (SPE) technique (Madrakian and Mousavi, 2008) was used to estimate U (VI) concentration after incubation also.