1. Phosphorus and Nitrogen in Three Lakes A study of the nutrient status in Lake Erken, Lake Limmaren and Lake Largen

2. Nitrogen Phosphorus N P

3. Internal and external loading of nutrinets Internal loading of nutrients from the sediment External loading of nutrients from inlets

4. Sampling Ekman grabber Ruttner sampler

5. Lake Erken Location of sediment, surface and bottom water sampling Location of inlet water sampling

6. Lake Limmaren Location of sediment, surface and bottom water sampling Location of inlet water sampling

7. Lake Largen Location of sediment, surface and bottom water sampling Location of inlet water sampling

8. Analyse of the samples Spectrophotometer

9. Total phosphorus and phosphate The total phosphorus and phosphate concentration in the lake water in the three lakes

10. Total nitrogen and nitrate and nitrite The total nitrogen and nitrate and nitrite concentration in the lake water in the three lakes

11. Lake Erken is a mesotrophic lake Lake Limmaren is an eutropic lake Lake Largen is an oligotrophic lake Conclution

12. Thanks for your attention!