| chemical and ecotoxicological assessment of polycyclic aromatic hydrocarbon--contaminated sediments of the niger delta, southern nigeria. | the extent of environmental contamination and sources of polycyclic aromatic hydrocarbons (pahs) compounds to sediments of the niger delta, nigeria were assessed using combined chemical analysis and toxicity bioassay techniques. concentrations of two- to six-ring pahs of molecular mass 128-278 and toxicity to vibrio fischeri and lemna minor are considered in this investigation. levels of the sum of the 16 usepa priority pollutant pahs varied from 20.7 to 72.1 ng/g dry weight. sediment pah levels ... | 2005 | 15752497 |