Distribution of heavy metals and organic in the clam culture areas at Binh Dai, Ba Tri, Thach Phu in Ben Tre province
Keywords:Heavy metals, organic, ICP-MS.
AbstractThe paper presents the contents of metals and organic in the surface sediments (5–10 cm) at the submerged clam culture areas in Ben Tre province. The metal samples were digested by nitric acid 10% and analyzed by ICP-MS method, total organic matters (HC) were determined by the burning method at 500oC. The results showed that the content of Zn ranged from 22.4 to 48.1 µg/g, Cu: 3.3–25.1 µg/g, Pb: 7.3–27.8 µg/g, As: 1.1–4.7 µg/g, Cd: 0.1–0.4 µg/g, Ni: 8.3–4.5 µg/g, Co: 7.3–11.9 µg/g, Cr: 5.8–15.3 µg/g, Fe: 0.8–1.74 µg/g and organic: 1.2–8.4%. The contents of all elements in the sediment in the canals were much higher than in the clam culture areas at the river mouths. The concentrations of metals in clam culture areas were lower than threshold effect levels (TEL) according to Canadian standards.
Morris, A. W., Allen, J. I., Howland, R. J. M., and Wood, R. G., 1995. The estuary plume zone: source or sink for land-derived nutrient discharges?. Estuarine, Coastal and Shelf Science, 40(4), 387–402.
Lê Thị Vinh, Phạm Văn Thơm, Nguyễn Hồng Thu, Dương Trọng Kiểm, Phạm Hữu Tâm, 1999. Hàm lượng kim loại nặng trong vật lơ lửng và trầm tích vịnh Bình Cang, Nha Trang. Tuyển tập Nghiên cứu biển, viện Hải dương học.
Heiri, O., Lotter, A. F., and Lemcke, G., 2001. Loss on ignition as a method for estimating organic and carbonate content in sediments: reproducibility and comparability of results. Journal of Paleolimnology, 25(1), 101–110.
Dean, W. E., 1974. Determination of carbonate and organic matter in calcareous sediments and sedimentary rocks by loss on ignition; comparison with other methods. Journal of Sedimentary Research, 44(1), 242–248.
Hungspreugs, M., Dharmvanij, S., Utoomprookpoom, W., and Windom, H. L., 1991. A comparative study for the trace metals fluxes of the Ban PaKong and the Mae Klong river. In Thailand-IOC workshop report (No. 79, pp. 34–44).
Hyland, J., Karakassis, I., Magni, P., Petrov, A., and Shine, J., 2000. Summary report: Results of initial planning meeting of the United Nations Educational. Scientific and Cultural Organization. 70 p.
Nga, B. T., Tinh, H. Q., Tam, D. T., Scheffer, M., and Roijackers, R., 2005. Young mangrove stands produce a large and high quality litter input to aquatic systems. Wetlands Ecology and Management, 13(5), 569–576.
Tam, N. F. Y., Wong, Y. S., Lan, C. Y., and Wang, L. N., 1998. Litter production and decomposition in a subtropical mangrove swamp receiving wastewater. Journal of Experimental Marine Biology and Ecology, 226(1), 1–18.