“…One of the limitations of bioaccessibility testing is that methods can vary widely, giving large ranges of percent bioaccessibility values (Koch et al, 2013). Additionally, bioavailability values, often used to "validate" bioaccessibility methods, are not available for the majority of elements (the exceptions are lead, arsenic and cadmium, and only for soil matrices, e.g., Schroder et al, 2004;Juhasz et al, 2009Juhasz et al, , 2010Denys et al, 2012, among others).…”