[1]Karst Wetland Ecology Research Center, Guizhou Minzu University, Guiyang 550025, China;
[2]School of Chemistry and Environmental Sciences, Guizhou Minzu University, Guiyang 550025, China;
[3]North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, China;
Cr; Distribution; Source; Clean; Jiaozhou Bay;