South China Sea, Biogenic elements, Marine sediments, Heavy metals, Sediment quality criteria, Water Pollution, Chemical, Environmental Monitoring, Bays, China, Geologic Sediments - chemistry, Metals - analysis, Water Pollutants, Chemical - analysis, Analysis, Sediments (Geology)
South China Sea, Environmental changes, Biogenic elements, Zhelin Bay, Metals, Dinoflagellate cysts, Water Pollution, Chemical - analysis, Geologic Sediments - analysis, Nitrogen - analysis, Bays, China, Humans, Environmental Monitoring - methods, Metals - analysis, Environment, Dinoflagellida, Water Pollutants, Chemical - analysis, Eutrophication