“…Examples of secondary analyses used to verify the Fe minerals or mineral groups present in the extracted leachate or the residual material, include MBS (Jilbert et al, 2018;Sun et al, 2018;Schröder et al, 2016), LA-ICP-MS (Oonk et al, 2018), SEM or TEM (Xie et al, 2018;Zhuang et al, 2012), XAS (Sun et al, 2018;Barber et al, 2017), tests with 58 Fe isotope spiking (Henkel et al 2016), or a percentage yield comparison from a single mineral control or internal laboratory standard (Jin et al, 2018;Liu et al, 2018;Lynch et al, 2018;Qi et al, 2018;Lei et al, 2017;Oonk et al, 2017;Xie et al, 2017;Raiswell et al, 2010). The advantage of MBS is the ability to analyse a sample non-destructively and in a single, short step without additional preparation.…”