Abstract:
Nowadays, everyday people apply various pharmaceuticals. However, after their consumption drugs excrete
to wastewater treatment plant, where they cannot be eliminated totally. As the result they released to surface
waters. Many scientists concerned about the effect of medical substances on aquatic biota. The issue of pharmaceutical
contamination is not well studied in Kazakhstan in comparison with EU countries. Therefore, it is
significant to do ecotoxicological research on pharmaceutical ingredients. The aim of our study was to assess
the effect of telmisartan on the growth of Chlorella species. Telmisartan was selected as currently it is one of
the priority pharmaceuticals based on risks to aquatic biota in Kazakhstan. We estimated exposure of substance
in 5–15 mg/L concentrations. According to the results, high concentration of our medical substance
had significant impact to the growth algae, it led to 83.93±0.13 % of growth inhibition. The half maximal inhibitory
concentration of telmisartan on algae was 6.16 mg/L. Furthermore, we calculated the growth rate of
Chlorella species. We found that growth rate decreased in six times on algae in concentration 15 mg/L in
comparison with controls. The following results showed that Chlorella species are vulnerable to the exposure
of pharmaceuticals
