Table 1 Summary of heavy metal extraction procedure.
From: Use of Heavy Oil Fly Ash as a Color Ingredient in Cement Mortar
Method | Leachant | L/S ratio by weight | Extraction time (h) | Temperature (°C) | Reference |
|---|---|---|---|---|---|
ANC | HNO3 solutions (pH 3.0) | 3:1 | 48 h | 25 | ECAEC (1986) |