“…spectrophotometric methods based on catalytic reactions [16], X-ray fluorescence spectrometry [17], spectrophotometry [18], the use of ion-selective electrodes [19,20], inductively coupled plasma mass spectrometry (ICP-MS) [21][22][23] or neutron activation analysis (NAA) [24]. Most reports concerning thyroid analysis are grounded on research into the animal tissue and, unfortunately, scientific studies on the iodine content in human thyroids are scarce.…”