Lead is widely used in everyday life, it has important physicochemical properties, and it is a very useful chemical element, abundant but dangerous. In plants, it has no physiological role and is a toxic element. To study the effect of this pollutant physiologically and chemically in bean (Vicia faba L.) plants, different doses of lead in the form of [Pb(NO 3 ) 2 ] (0, 50, 100, 200, 500, 1000, 2000 ppm) were added to the culture substrate consisting of sand and compost. The results of this study showed a reduction in relative water content (RWC) in dry weight and chlorophyll pigment content. The results also showed a significant reduction in sodium (Na) in the roots and stems. The presence of lead caused significant physiological and chemical disturbances.

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