Alternatively, for direct energy coupling devices, such as a microwave, digest samples for analysis by FLAA and ICP-AES by adding 5 mL HCl and 10 mL H O to the 2 o osample digest from 7.2.3 and heat the sample to 95 C ± 5 EC, Reflux at 95 C ± 5EC without boiling for 5 minutes.