GAN Huayang1,2, HE Haijun1,2, XIA Zhen1,2, LI Feng3
(1. Guangzhou Marine Geological Survey, Guangzhou, 510760;
2. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510760，China;
3. Department of Hydraulic Engineering, South China University of Technology, Guangzhou 510641，China)
Abstract: The distribution, enrichment, source and potential eco-risk of heavy metals and nutrient elements in sediments of the Yangpu Bay, Hainan Island, were analyzed. The concentrations of Cu, Zn, Pb, Cr, As, Cd, Hg, TN, TP and TOC in surface sediments were 11.9±6.8, 48.8±27.3, 22.6±6.2, 33.7±23.3, 5.17±2.20, 0.035±0.022, 0.055±0.034, 549.80±392.80, 300.72±175.79 μg/g and 0.62±0.62%, respectively. The mean concentrations of Cr, As, Hg and TP were higher in the open bay than in the inner bay. High levels were found for all analyzed elements in sediments of the open bay, the northern coast and the estuary of Chun river in the inner bay, but heavy to severe enrichments were found at the west part of the southwestern coast of inner bay. The modern sedimentary rate of the Yangpu Bay was about 0.58-1.18 cm/a. The enrichments of TN, TP, Hg, TOC and Cu started from 1950s or 1980s, which were likely caused by increasing pollution discharge during the rapid economic development after the founding of new China and the implementation of reforming and opening policy. The estimated deposit fluxes of seven heavy metals and three nutrient elements in the Yangpu Bay were about 1100 mg/(m2？a) and 130 mg/(m2？a), respectively. Although the sediment quality was roughly good and the potential eco-risks of heavy metals were currently low, cautions should be given for As, TOC and Hg to avoid happening of negative ecological effects after their continuous accumulation in sediments.
Key words: Heavy metals; nutrient elements; sediment; Yangpu Bay
EARTH AND ENVIRONMENT Vol.46, No.5, Tot No.325, 2018, Page 463-474
