Distribution and Changing of Petroleum Hydrocarbon in Jiaozhou Bay Waters

Based on the investigation data of petroleum hydrocarbon (PHC) in waters in Jiaozhou bay on April, August and November 1981, this paper analyzed the distribution and changing of PHC content in surface and bottom waters. Results showed that pollution levels of PHC ranged from Grade II, Grade III, Grade IV and worse than Grade IV during year. PHC content was relatively high in near shore waters especially in river mouth waters, while was relatively low in bay mouth, bay center and outer bay. It could be concluded that, in addition to marine exploitation activities, rivers were important pollution sources of PHC.