Laboratory studies of dissolved radiolabelled microcystin-LR in lake water

TY - JOUR

T1 - Laboratory studies of dissolved radiolabelled microcystin-LR in lake water

AU - Hyenstrand, Per

AU - Rohrlack, Thomas

AU - Beattie, Kenneth A

AU - Metcalf, James S

AU - Codd, Geoffrey A

AU - Christoffersen, Kirsten

PY - 2003/8/1

Y1 - 2003/8/1

N2 - 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.

AB - 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.

KW - Bacterial Toxins

KW - Carbon Radioisotopes

KW - Cyanobacteria

KW - Environmental Monitoring

KW - Enzyme Inhibitors

KW - Eutrophication

KW - Marine Toxins

KW - Microcystins

KW - Peptides, Cyclic

KW - Phosphoprotein Phosphatases

KW - Solubility

KW - Water Supply

U2 - 10.1016/S0043-1354(03)00180-5

DO - 10.1016/S0043-1354(03)00180-5

M3 - Journal article

C2 - 12834722

SN - 0043-1354

VL - 37

SP - 3299

EP - 3306

JO - Water Research

JF - Water Research

IS - 14

ER -