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8 mL of 65% HNO3 using a microwave digestion system (Multiwave GO; Anton Paar GmbH, Graz, Austria) that followed a two-step heating program: (1) 170 °C reached within 3 min and held for 10 min, and (2) 180 °C reached within 10 min and held for 10 min, followed by cooling. ...