In general, total concentration of metals in hydrocarbons and other matrices is usually determined by spectroscopic methods after sample dissolution. For matrix digestion, many methods have been proposed in the literature. They are essentially based on wet digestion procedures often using nitric and hydrochloric acids combined with hydrogen peroxide, to solubilize metals prior analysis by inductively coupled plasma-atomic emission spectroscopy or inductively coupled plasma-mass spectrometry (ICP-AES and ICP-MS).Combination of mineral acids such as HNO.HCIO4, HNO.HCl, HNO.HClO4.HF, HNO.HCl.HF,and HNO.HF have been also reported.
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