Table 2-1M: US-EPA Method 3031 Standard Method
US-EPA Method 3031 (A13)
Acid Digestion of Oils for Metals Analysis
by FLAA or ICP Spectroscopy
Type |
Matrix |
Analytes |
Detection |
Control |
Microwave Digestion |
Oil |
Ag, As, Ba, Be, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, Se, Tl, V, Zn |
FAAS ICP-AES |
Calibration |
Condensed Procedure |
Method 1: 0.5 g sample and 0.5 g KMnO4 20% for 2 min add 2 mL H2SO4, 20% for 3 min (to near dryness) add 10 mL HNO3 and 2 mL HCl, 15% for 5 min, 20% for 3 min (to near dryness), cool for 5 min add 5 mL HCl, 15% for 5 min Method 2: 0.5 g sample and 10 mL H2SO4 20% for 5 min, 25% for 5 min, 30% for 5 min, 35% for 5 min, cool for 5 min add 8 mL H2O2, 50% for 5 min, cool for 5 min add 8 mL H2O2, 60% for 5 min |