2015. Effects of Heavy Metal (Pb) on the Growth of Algae Microcystis sp. & Chroococcus sp. Roaa Jafar El-Khairalla . University of Thi-Qar Journal of Science. 5, 2 (May 2015), 65–71. DOI:https://doi.org/10.32792/utq/utjsci/v5i2.108.