Table 1:
Mercury Concentration in Cortical Sections from Rochester Reference Cases
| Case No. and Gender | Age (yr) | Cortical Region | Total Hg (ppb) | Inorganic Hg (ppb) | Inorganic Hg (%) |
| R1F | 67 | Calcarine | 13 | 10 | 77 |
| Rolandic | 17 | ND | 18 | ||
| Cerebellum | 21 | ND | 14 | ||
| R2F | 56 | Calcarine | 16 | ND | 19 |
| Rolandic | ND | ND | ND | ||
| Cerebellum | 13 | 6 | 46 | ||
| R3M | 66 | Calcarine | 21 | 7 | 33 |
| Rolandic | 24 | 8 | 33 | ||
| Cerebellum | 22 | 9 | 41 | ||
| R4F | 57 | Calcarine | 16 | ND | 19 |
| Rolandic | 21 | 8 | 38 | ||
| Cerebellum | 17 | ND | 20 | ||
| Mean ±SD | 62 ±6 | Calcarine | 16 ±3 | 6 ±3 | 37 ±27 |
| n=4 | Rolandic | 16 ±9 | 6±3 | 22 ±17 | |
| Cerebellum | 18 ±4 | 5±3 | 30 ±16 | ||
| Brain | 17±6 | 6±3 | 30±19 | ||
*
ND – None detected. The detection limit is 3 ppb. In calculating mean values, except in the case of % inorganic mercury where total mercury was also ND, a value of 3 ppb was substituted for ND.