source identification of polycyclic aromatic hydrocarbons (pahs) in sediments from the rivers and coasts of the southwest caspian sea (guilan province) using pca

to assess the sources, entry routes and degree of contamination of pah compounds in surface sediments of the southwestern caspian sea coasts (gillan province) total of 129 surface sediment samples from 28 rivers and 5 transect across the gillan province coasts (from astara to lahijan; 10, 20 and 50 m depth) were collected in the spring and summer of 2012. after extraction using soxhlet method, the samples were analysed using gas chromatography-mass spectrometry (gc-ms) and concentrations of 30 pah compounds were determined. the mean of total 30 pah compounds (tpah30) in the coastal sediments (565.1±266.1 ng g-1) have shown significant difference (p