Mean aluminium (Fig. 3E) levels were significantly higher in Norway (N: 62.1 46.1, C: 39.6 138.6 mg/L). In Chile, however,
extreme at-site variation was observed, with values >300 mg/L which were higher than those observed in Norway. Fe levels (Fig. 3F) were not significantly different between countries. The distributions show lower levels in Chile below the 50 percentile, while more extreme values are observed in Chile in the upper end of the distribution, approaching 2000 mg/L in the extreme cases.