The distribution characteristics of PAHs and the influencing factors in Dishui lake and crucian carp

Investigated the pollution levels, distributions, compositions, sources and influencing factors in dissolved phases, suspended particular matters and sediments of Dishui Lake, the results showed that average concentrations of total PAHs in those medium were 16.78 ng/L, 33.02 ng/g and 40.98 ng/g respectively. Statistical analyses suggested that Water pH and conductivity was correlated to the concentrations of low molecular weight PAHs in dissolved phases, while total organic carbon (TOC) was correlated to the concentrations of high molecular weight PAHs in sediments. PAHs in dissolved phases were mainly from high temperature combustion of straw, wood and coal. There are also some samples showed the oil source. Combustion and oil spill were the sources of PAHs in suspended particular matters. While both combustion and petrogenic inputs were the sources of PAHs in sediments. By measuring the concentrations of PAHs in the crucian carp muscles, eggs and gills, we found the concentrations of PAHs in the gills of crucian carp were the highest, followed by the meat and roes. Compared to concentrations of PAHs in the fishes of other areas in the world, the concentrations ranges was in the lower level, but some samples with a higher BaP equivalent concentrations than the EPA regulations.