Effect of various concentrations of zinc on the levels of chlorophyll a, b and carotenoid in green alga Scenedesmus sp.

Green algae are one of the most numerous, scattered and morphologically diverse branches of algae with b and a chlorophyll. These algae are in addition to various chlorophyll carotenoids. Heavy metals are toxic because of the most important environmental pollutants. The release of these pollutants, due to the lack of environmental degradation in the environment and the health of living organisms, is endangered. One of the most important heavy metals is Zinc. This research was carried out by investigating the effect of various concentrations of heavy metal zinc on chlorophyll and carotenoids levels by Scenedesmous sp. algae In this study, the effects of various concentrations of Zinc (0, 30, 50 mg/ml) on the amount of chlorophyll a, b and carotenoid in Scenedesmus sp. algae under the temperature of 25°C and the light intensity of 3500±350 and the light period 12:12 brightness and darkness for 48 hours with three repeat in a completely randomized design. The results showed that by increasing the amount of zinc metal in the concentration of 50 mg/ml, the amount of chlorophyll a was 1.23 ug/L and chlorophyll b was 1.43 ug/L and the carotenoid value was 1.77 ug/L control declined. Zinc metal in Senedemesus algae even at very low concentrations of zinc element causes physiological disorder of green algae Scenedesmus sp, so zinc metal can have an inhibitory effect on growth and pigments.