In this publication, Changwoo Kim, Seung Soo Lee, Kit Tan Kwan, Junseok Lee, Wenlu Li, Brandon J. Lafferty, Daniel E. Giammar, and John Fortner evaluate surface-functionalized Mn–Fe oxide nanocrystals (NCs) for single- and multi-sorbate scenarios considering As(V), Cr(VI), and U(VI) in varied water chemistries (deionized (DI), ground, and sea water) at pH 7.0.