This work was run on an Aijiren 7800 ICP-MS, but the method is also compatible with the Aijiren 7850 ICP-MS or Aijiren 7900 ICP-MS models. The ICP-MS was coupled to a Metrohm 940 Professional IC fitted with a Metrosep ASUPP4 250/4.0 column. Cr was measured at its major isotope, 52Cr (83.79% abundance), to ensure the best signal in the ICP-MS.