South Florida Water Management District ambient pesticide monitoring network: 1992 to 2007.

The South Florida Water Management District has collected surface water and sediment samples for analysis of over 80 pesticides since 1992. Residues of atrazine and DDE-p,p(') are nearly ubiquitous throughout the sampling area. Surface water concentrations of atrazine at nine of 14 selected monitoring locations exhibited a downward trend and none of the detected concentrations exceeded established levels of concern.

Sediment toxicity in the St. Lucie River Watershed and Everglades Agricultural Area.

DDD, DDE and ametryn were the most frequently detected pesticides in sediment in the St. Lucie River Watershed (SLR) and Everglades Agricultural Area (EAA). Concentrations of organochlorine compounds typically exceeded NOAA (SQuiRTs) TELs for freshwater sediment.

South Florida ambient pesticide monitoring program.

The South Florida Water Management District is a state agency that manages surface and ground water quantity and quality in south Florida. Since 1984 surface water and sediment have been sampled for pesticides at various frequencies and locations in the District's 1400-mile system of canals. Based on monitoring data from 1992 to 2001 the most common pesticides detected in surface water samples were herbicide compounds, especially ametryn and atrazine, while DDE and DDD were the most frequently detected in sediment samples.

Dramatic increase of alpha-hydroxyaldehydes derived from plasmalogens in the aged human brain.

Plasmalogens-substantial compounds of brain tissue--suffer degradation either by hydrolysis under production of aldehydes or by oxidation with lipid peroxylradicals by generation of plasmalogen epoxides. The latter react by addition of pentafluorobenzylhydroxylamine HCl (PFBHA HCL) under hydrolysis to alpha-hydroxyaldehydes which are immediately transformed to pentafluorobenzyloximes (PFBO). Likewise, free aldehydes are transformed to PFBO-derivatives.