2.4.2. Total mercury analysis
The total mercury content in seafood and CRM samples was determined by ICP-MS following microwave digestion. Initially, 0.1e1 g of samples were weighed in digestion vessels, after which 8 mL of concentrated nitric acid and 2 mL of hydrogen peroxide were added. The microwave digestion procedure was as follows: 10 min from room temperature to 90 C, maintained for 5 min at 90 C,10 min from 90 C to 120 C,10 min from 120 C to 190 C and 10 min maintained at 190 C. After cooling to room temperature, the digested samples were diluted in water up to 20 mL