Abstract
The fate of dissolved microcystin-LR was studied in laboratory experiments using surface water taken from a eutrophic lake. Based on initial range finding, a concentration of 50 microg l(-1) dissolved 14C-microcystin-LR was selected for subsequent time-course experiments. The first was performed in May before the cyanobacterial bloom season and low increases in the radioactivity of particulate fractions occurred with an approx. halving of the cyano-toxin during 4 days. The radioactivity of the dissolved fraction remained stable and there was no significant formation of radiolabelled inorganic carbon. A second time-course experiment was performed in September during the cyanobacterial bloom season. At the end of the four-day incubation period, the microcystin-LR concentration had decreased to an undetectable level and 24% of the added radiolabelled substance was found in different particulate fractions. The study demonstrated that biodegradation of dissolved microcystin-LR occurred in water collected at a lake surface with carbon dioxide as a major end-product.
| Original language | English |
|---|---|
| Journal | Water Research |
| Volume | 37 |
| Issue number | 14 |
| Pages (from-to) | 3299-306 |
| Number of pages | 8 |
| ISSN | 0043-1354 |
| DOIs | |
| Publication status | Published - 1 Aug 2003 |
Keywords
- Bacterial Toxins
- Carbon Radioisotopes
- Cyanobacteria
- Environmental Monitoring
- Enzyme Inhibitors
- Eutrophication
- Marine Toxins
- Microcystins
- Peptides, Cyclic
- Phosphoprotein Phosphatases
- Solubility
- Water Supply
