Simultaneous Determination of Mixed Heavy Metal Ions Cr (III) and Co (II) in Wastewater by Cloud Point Extraction Dual Wavelength SpectrophotometryHongmei Liu, Jun Xie and Hongming QianE3S Web of Conf., 406 (2023) 01012DOI: https://doi.org/10.1051/e3sconf/202340601012