Health Risk Assessment of Heavy Metals in Surface Water of the Lhasa River, China Liu He, Bai Gao, Huanhuan Qin, Junping Liu, Xiaoyan Ding, Dhawan Sanjay and Andre Dong E3S Web Conf., 98 (2019) 09011 Published online: 07 June 2019 DOI: 10.1051/e3sconf/20199809011