Spatial-temporal changes of Cr sources in Jiaozhou Bay

Abstract

Cr pollution in marine bay is one of the environmental issues in many countries and regions, and the understanding of the spatial-temporal variation of Cr sources in marine bay is essential to pollution control. Based on investigation on Cr in surface waters, this paper analyzed distributions and spatial-temporal variations of Cr sources in Jiaozhou Bay, eastern China during 1979-1983. Results showed that for spatial variations, the strong Cr sources were in estuaries of the major inflow rivers (i.e. Haibo River, Licun River and Loushan River), and the source strengths were 4.17-112.30 μg L−1. For temporal variations, the source strengths were changing from moderate stage (1979-1981) to slight stage (1982-1983),whose source strengths were 32.32-112.30 μg L−1 and 4.17-19.76 μg L−1, respectively. In general, the spatial-temporal variations of Cr sources in Jiaozhou Bay were significant, which should be taken into account for the countermeasures for pollution control.