Variations of Pb Content in the Bottom Waters of the Jiaozhou Bay from the South of the Bay Mouth to the Central Bay Area

Abstract

According to research data of the Jiaozhou Bay waters in 1992, current variation and horizontal distribution of Pb content in the bottom waters of the Jiaozhou Bay from the south of the bay mouth to the center of the bay were studied. The results show that in May, August, and October, Pb content in the Jiaozhou Bay water ranges from 4.20 to 24.39μg/L, which is in line with the national Class II, Class III, and Class IV seawater quality standards. This result indicates that in May, August and October, in the studied waters, the water quality was slightly, moderately and heavily polluted by Pb content, further revealing that under the effect of vertical water bodies, the bottom waters from the south of the bay mouth to the southeast of the bay, to the center and the southwest of the bay have been severely polluted by human discharge of Pb content. In addition, in the bottom waters of the Jiaozhou Bay from the south of the bay mouth to the center of the bay, Pb content showed high settlement: in May, the southeastern waters; in August, in the central waters; in October, in the southern waters. Therefore, the lead content of Jiaozhou Bay in different months and different places showed high deposition.