EPA Methods 3052

Microwave-Assisted Acid Digestion of Siliceous and Organically Based Matrices

EPA Methods 3051a 

Microwave-Assisted Acid Digestion of Sediments, Sludges, Soils, and Oils

EPA Methods 3015a 

Microwave-Assisted Acid Leach of Aqueous Samples and Extracts

These EPA methods can be downloaded from here

Standard Practice for the Preparation of Dried Paint Samples by Hotplate or Microwave Digestion for Subsequent Lead Analysis

ASTM D5513-99

Standard Practice for Microwave Digestion of Industrial Furnace Feedstreams and Waste for Trace Element Analysis

ASTM D4309-96

Standard Practice for Sample Digestion Using Closed-Vessel Microwave Heating Technique for the Determination of Total Metals in Water

ASTM E1741-00

Standard Practice for Preparation of Airborne Particulate Lead Samples Collected During Abatement and Construction Activities for Subsequent Analysis by Atomic Spectrometry