99/2008 / QD-BNN & PTNT [103] Evaluate results of As, Pb, Cd, Cr and Hg content in seafood according to National Standards on food according to QCVN 8 - 2: 2012 / BYT [104] * Blood Pb and Cd were examined with atomic absorption spectroscopy 8 * 24 hour urinary As, ALA, Cr and Hg concentations were determined with atomic absorption spectroscopy and plasma mass spectrometry.