Distribution and Contaminant Source of Series Chemicals of Phenanthrenes in the Topsoil of Tianjin Area

The distribution characteristics of phenanthrene concentration, chemical composition of phenanthrene and its homologous series in surface soil fromTianjin region were investigated. The pollution sources of polycyclic aromatic hydrocarbon(PAHs) in surface soil samples collected from different geographic locations with various surrounding environment were discussed according to some geochemistry parameters, including phenanthrene/ anthracene(P/A), methylphenanthrene index 1 (MPI1) and methylphenanthrene/ phenanthrene (MP/P) that usually were used to predict the pollution sources. The result showed that the PAHs contaminant in the surface soil of Tianjin urban, Tanggu and Hangu district mainly originated from vehicles and coal burning production. The PAHs pollutant in the surface soil from northwest of Wuqing, north of Jixian and southwest of Baodi mainlyresulted from the production of coal and wood burning in this place and the settling matter of atmospheric that transported from the other areas through long distance. The major contaminant source of PAHs in the surface soil of the three sewage river flooding areas was the crude oil mainly originated from industry waste water in Tianjin, Beijing sewage river flooding areas including the north of Beichen and a common boundary with Wuqing, Baodi and Ninghe, Beitang sewage river flooding areas including the southeast of Dongli and Dagu sewage river flooding including the north of Xiqing and the south of Jinnen. The main contaminant source of Dagang was the production of coal burning transported over long distances by atmosphere movement, while, crude oil leaking was not the main contaminant source in this oil field. The main PAHs contaminant source in Jinghai County wasthe production of incomplete combustion of fossil fuels which were transported over long distances by atmosphere movement.