Koenigshafen | Months of annual minimum conc. | Months of annual maximum conc. | Annual range (ng g−1) ww/dw | Range over 17 years (ng g−1) ww/dw |
---|---|---|---|---|
Cobalt | Dec.–Feb. | Apr.–Aug. | 57.9/798 | 27.8/478 |
Copper | Oct.–Feb. (except 2013) | April | 261/1953 | 296/1984 |
Cadmium | No clear seasonality, n.c. | 26.5/611 | 28.3/723 | |
Nickel | Aug.–Oct. | June | 133/1872 | 86.2/1469 |
Lead | Oct. | April | 50.4/996 | 88.7/1487 |
Mercury | Aug.–Oct. | Dec.–April | 10.6/127 | 8.73/132 |
Methylmercury | June–Aug. | Oct.–April | 5.41/46.7 | 4.99/33.2 |
Arsenic | June–Oct. | Dec.–April | 975/9538 | 1062/9830 |
Selenium | Aug.–Oct. | Dec.–April | 276/2003 | 194/1095 |
Tributyltin | Aug.–Dec. | April | 1.81/20.6 | 1.04/16.6 |