Cadmium Rock, soil, mining metallothionein Pesticides, geochemical mineralization and Pesticides, Industrial industrial waste. 13. Lead waste 14. Arsenic Soil, food and water Soil, food and water 15. Mercury Pesticides, food, water and soil Fishes, pesticides, food, water and soil Potential toxicity References Thauer, 1985; Hausinger, 1987; No report for Walsh .