1. The study has been carried out on Wistar rats. The aim of the prese
nt study was to trace the effect of aluminum on enzyme activities and
hematological parameters on erythrocytes. 2. Aluminum decreased activi
ties of acetylcholinesterase, glutathione reductase, glucose-6-phospha
te dehydrogenase, and lactate dehydrogenase in the erythrocytes of the
animals tested. 3. In the peripheral blood, a significant decrease in
the erythrocyte count, hemoglobin level and hematocrit index and incr
eased percentage of reticulocytes and polychromatophilic erythrocytes
were observed. 4. The increase in the neutrophilic granulocyte and lym
phocyte count was significant. 5. An inhibitory effect of aluminum on
the phagocytic activity of granulocytes was also observed.