Synthesis of Fulvic Acid-Coated Magnetite (Fe3O4–FA) and Its Application for the Reductive Adsorption of [AuCl4]– - Krisbiantoro, Philip Anggo; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, Indonesia (Universitas Gadjah Mada, 2017)