The effect of crude oil on the biochemical parameters of the blood of white rats Alibek Ydyrys, Nurzhaniyat Ablaikhanova, Balgyn Amanbay, Kalamkas Seiykadyr and Dana Demeuova E3S Web Conf., 254 (2021) 09003 Published online: 05 May 2021 DOI: 10.1051/e3sconf/202125409003