Table 5.16 - Phosphorus and nitrogen levels in lakes in relatively unpolluted areas such as remote mountain regions and national parks
Sources:
Site | Country Ý | Number of lakes | Total phosphorus µg P/l | Nitrate µg N/l | Ammonium µg N/l |
---|---|---|---|---|---|
Sierra Nevada1 | ES | 10 | 3.9* | 6 | |
Pyrenees2 | ES | 102 | ~15 | ~139 | ~25 |
Tatra Mountains3 | SK | 10 | 5.7 | 400 | 14 |
Northern Apennines4 | IT | 43 | 14 | 112 | 28 |
Southern Alps5 | IT | 50 | 19 | 327 | 42 |
Italian Alps6 | IT | 320 | <10 (85%) | 14 | 18 |
Italian Alps, Aosta Valley7 | IT | 100 | | 140 | |
Sweden, reference-lakes8 | SE | 154 | <15 (80%) | <750# (87%) | |
Northern Sweden, forest lakes9 | SE | 59 | 13.2 | 350 | |
Finland, forest lakes10 | FI | 135 | 10 | | |
Black Forest Lakes11 | DE | 6 | | 429 | |
Notes: Values shown are mean values or percentages with concentrations below a specified limit. * dissolved orthophosphate # total nitrogen Ý for country codes see Table 5.9.