Microcystins in the drinking water supply in the cities of Ensenada and La Plata (Argentina

ECHENIQUE R., RODR¨ªGUEZ J., CANEO M., GIANUZZI L., BARCO M., RIVERA J., CAIXACH J. & ANDRINOLO D

Anais do XICBFic Livros do Museu Nacional

Museo Nacional

Lugar: Rio de Janeiro; Año: 2007

The presence of the Cyanobacterium Microcystis aeruginosa was studied in the coastal zone of R¨ªo de la Plata river at Ensenada (Argentina) from December 2004 to April 2005, with the aim of evaluating the occurrence of cyanotoxins and their eventual presence in the main drinking water supply of La Plata and Ensenada cities. The study shows the constant presence of M. aeruginosa toxic blooms in R¨ªo de la Plata river in the analyzed period. These blooms proved to be highly toxic and would correspond to successions of different strains of this species, each one with a different toxicological profile and toxicities varying between 440 and 9700 ¦Ìg microcystins per gram of dry weight. The presence of microcystins in drinking water was detected in 10 out of 13 samples. It is concluded that microcystins released by M. aeruginosa, which develops under eutrophic conditions in the R¨ªo de la Plata river, reach the drinking water network and attain concentrations that sometimes exceed the safe limit of 1 ¦Ìg.l-1 recommended by the WHO.Microcystis aeruginosa was studied in the coastal zone of R¨ªo de la Plata river at Ensenada (Argentina) from December 2004 to April 2005, with the aim of evaluating the occurrence of cyanotoxins and their eventual presence in the main drinking water supply of La Plata and Ensenada cities. The study shows the constant presence of M. aeruginosa toxic blooms in R¨ªo de la Plata river in the analyzed period. These blooms proved to be highly toxic and would correspond to successions of different strains of this species, each one with a different toxicological profile and toxicities varying between 440 and 9700 ¦Ìg microcystins per gram of dry weight. The presence of microcystins in drinking water was detected in 10 out of 13 samples. It is concluded that microcystins released by M. aeruginosa, which develops under eutrophic conditions in the R¨ªo de la Plata river, reach the drinking water network and attain concentrations that sometimes exceed the safe limit of 1 ¦Ìg.l-1 recommended by the WHO.M. aeruginosa toxic blooms in R¨ªo de la Plata river in the analyzed period. These blooms proved to be highly toxic and would correspond to successions of different strains of this species, each one with a different toxicological profile and toxicities varying between 440 and 9700 ¦Ìg microcystins per gram of dry weight. The presence of microcystins in drinking water was detected in 10 out of 13 samples. It is concluded that microcystins released by M. aeruginosa, which develops under eutrophic conditions in the R¨ªo de la Plata river, reach the drinking water network and attain concentrations that sometimes exceed the safe limit of 1 ¦Ìg.l-1 recommended by the WHO.M. aeruginosa, which develops under eutrophic conditions in the R¨ªo de la Plata river, reach the drinking water network and attain concentrations that sometimes exceed the safe limit of 1 ¦Ìg.l-1 recommended by the WHO.-1 recommended by the WHO.