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riduan, ahmad and Rainiyati, Rainiyati and Heraningsih, Sarah F (2020) Palm Oil Fuel Ash [POFA]: innovative potential applications as heavy metal removal materials in gold mining wastewater. IOP Conf. Series: Earth and Environmental Science 497 (2020) 012041, 497 . IOP Conf. Series: Earth and Environmental Science 497 (2020) 012041, Padang, West Sumatera, Indonesia.