Mercury (Hg) is in the form of monomethylmercury (MeHg) a biological neurotoxin, harmful to the wildlife and to humans. MeHg species is produced from Hg2+ by natural processes occurring within the water bodies. MeHg can also be degraded by natural processes; therefore, the net MeHg production arise form the combination of both kind of processes. The analytical tools to assess these processes consi ...