in this book there are some methods to extraction of polycyclic aromatic hydrocarbons(with some modified) from many environmental medium, measured it and measured the physical and chemical properties for these medium and study the phytoplanktons and analyzed by statistical process. finally explain the using of some phytoplanktons as bioindicators, biosensors and biomonitors. this book very benefit for any searchers in polycyclic aromatic hydrocarbons, phytoplanktons and physical and chemical properties for water, sediments and organisms.