Distribution and homogeneity of petroleum hydrocarbon in Jiaozhou Bay

Based on investigation dada on petroleum hydrocarbon (PHC) in April, June, Juny and October 1982 in Jiaozhou Bay, this paper analyzed the content, distribution and seasonal variations of PHC. Results showed that PHC contents in April, June, July and October in surface waters ranged from 0.03-0.07 mg.L-1, 0.05-0.10 mg.L-1,0.04-0.07 mg.L-1 and 0.03-0.04 mg.L-1, respectively, and were meeting Grade II and III in National Sea Water Quality Standard (GB 3097-1997), and were generally decreasing with time within the year. For spatial distribution, the ranges of PHC contents in April, July and October were 0.02 mg.L-1, 0.03 mg.L-1 and 0.01 mg.L-1, respectively, indicated that the distributions of PHC in the southwest were tended to be homogenous. The results confirm that tide and current are stirring and transporting all of the materials in the ocean, resulting in the homogous distributions of the contents of various materials in waters.