| risk analysis of herbicide quinclorac residues in irrigated rice areas, santa catarina, brazil. | deterministic and probabilistic risk analyses were carried out for seven hydrographic basins in the state of santa catarina (brazil), where irrigated rice is cultivated. monitoring studies conducted in 1998/1999 and 1999/2000 had found that the herbicide quinclorac was the most frequently detected agrochemical residue, occurring in five of the seven hydrographic basins. in order to assess the ecological risk posed by quinclorac, median lethal concentration (lc(50)) and median effective concentra ... | 2007 | 17879160 |