def METHOD_NAME(self):
    obj = self.df.copy(deep=True).pyrochem.compositional
    REEppm = obj.pyrochem.REE.pyrochem.scale("wt%", "ppm")
    self.assertFalse(np.isclose(REEppm.values, obj.pyrochem.REE.values).any())
    self.assertTrue((REEppm.values > obj.pyrochem.REE.values).all())