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One of the most important pollutants for nature is heavy metals and more than 40 metals and alloys are used in the industry. Pollution brought by the heavy metals into the water is reaching to human health a threatening level [1]. Heavy metals have a relatively high density compared to other metals and they are toxic or poisonous even at low concentrations [2] on the metabolic functions of living organisms after certain levels and even cause their deaths [3].

Protective Role of Sodium Selenite on the Toxic Effect of Lead Nitrate on Human Erythrocytes