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Metals
| N (%) | |
|---|---|
| Lead | 35 (26.1) |
| Iron | 27 (20.1) |
| Mercury | 15 (11.2) |
| Chromium | 13 (9.7) |
| Cobalt | 10 (7.5) |
| Arsenic | 6 (4.5) |
| Miscellaneousa | 28 (20.9) |
| Class total | 134 (100) |
aIncludes vanadium, aluminum, barium, copper, manganese, nickel, silver, titanium, beryllium, cadmium, gadolinium, potassium dichromate, metal unspecified, uranium, and strontium
