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Sediment and water samples collected from 20 sampling stations located in the Chao Phraya River Mouth, Thailand during 2017 and 2019 were analyzed for concentrations of mercury (Hg) as well as other heavy metals including cadmium (Cd), zinc (Zn), nickel (Ni) and lead (Pb). The results indicated that the enriched concentrations of heavy metals (Hg, Cd, Zn, Ni and Pb) were observed in sediments of the Chao Phraya River Mouth during 2017 and 2019. The higher concentrations of heavy metals were found in the suspended sediment in comparison to the bottom sediment. The concentrations of heavy metals (Hg, Cd, Zn, Ni and Pb) in water of the Chao Phraya River Mouth during 2017 and 2019 were lower than the coastal water quality standard in Thailand. Because of the high freshwater inflow and the discharge of low amount of heavy metals in the treated industrial effluent to the Chao Phraya River, the high levels of heavy metals in sediments of the Chao Phraya River Mouth might be caused by weathering of rock, sediment transport and deposition within the Chao Phraya River Basin. The spatial variation of heavy metals in sediments of the Chao Phraya River was existed, due to adsorption and co-precipitation of dissolved heavy metals onto sediments and aggregation-sedimentation of suspended sediment during transport. The seasonal variation of dissolved heavy metals in water of the Chao Phraya River Mouth was observed, due to accumulation and release of dissolved heavy metals from sediments.
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 Thongra-ar, W. and Parkpian, P. 2002. Total mercury concentrations in coastal areas of Thailand: A review. ScienceAsia, 28: 301-312.
 Mclaren, R.G., Kanjanapa, K., Navasumrit, P., Gooneratne, S.R. and Ruchirawat, M. 2004. Cadmium in the water and sediments of the Chao Phraya River and associated waterways, Bangkok, Thailand. Water Air and Soil Pollution, 154: 385-398.
 Wijaya, A.R., Ouchi, A.K., Tanaka, K., Cohen, M.D., Sirirattanachai, S., Shinjo, R. and Ohde, S. 2013. Evaluation of heavy metal contents and Pb isotopic compositions in the Chao Phraya River sediments: Implication for anthropogenic inputs from urbanized areas, Bangkok. Journal of Geochemical Exploration, 126-127: 45-54.
 Qiao, S., Shi, X., Fang, X., Liu, S., Kornkanitnan, N., Gao, J., Zhu, A., Hu, L. and Yu, Y. 2015. Heavy metal and clay mineral analyses in the sediments of Upper Gulf of Thailand and their implications on sedimentary provenance and dispersion pattern. Journal of Asian Earth Sciences, 114: 488-496.
 Ali, M.M., Ali, M.L., Islam, M.S. and Rahman, M.Z. 2016. Preliminary assessment of heavy metals in water and sediment of Karnaphuli River, Bangladesh. Environmental Nanotechnology, Monitoring and Management, 5: 27-35.
 Bhuyan, M.S., Bakar, M.A., Akhtar, A., Hossain, M.B., Ali, M.M. and Islam, M.S. 2017. Heavy metal concentration in surface water and sediment of the Megha River, Bangladesh. Environmental Nanotechnology, Monitoring and Management, 8: 273-279.
 Tao, Y., Yuan, Z., Wei, M., Xiaona, H. 2012. Characterization of heavy metals in water and sediments in Taihu Lake, China. Environmental Monitoring and Assessment, 184: 4367-4382.
 Menasveta, P. and Cheevaparanapiwat, V. 1981. Heavy metals, Organochlorine Pesticides and PCBs in Green Mussels, Mullets and Sediments of River Mouths in Thailand. Marine Pollution Bulletin, 12: 19-25.
 Hungspreugs, M. and Yuangthong, C. 1983. A history of metal pollution in the Upper Gulf of Thailand. Marine Pollution Bulletin, 14: 465-469.
 Sirirattanachai, S. and Utoomprurkporn, W. 2005. Mercury in the Chao Phraya River Estuary, Thailand. Burapha Science Journal, 10: 1-16.
 Fan, H., Chen, S., Li, Z., Liu, P., Xu, C. and Yang, X. 2020. Assessment of heavy metals in water, sediment and shellfish organisms in typical areas of the Yangtze River Estuary, China. Marine Pollution Bulletin, 151: 1-9.
 Jia, Y., Wang, L., Qu, Z. and Yang, Z. 2018. Distribution, contamination and accumulation of heavy metals in water, sediments, and freshwater shellfish from Liuyang River, Southern China. Environmental Science and Pollution Research, 25: 7012-7020.
 Singh, H., Pandey, R., Singh, S.K. and Shukla, D.N. 2017. Assessment of heavy metal contamination in the sediment of the River Ghaghara, a major tributary of the River Ganga in Northern India. Applied Water Science, 7: 4133-4149.
 Song, Y., Ji, J., Mao, C., Yang, Z., Yuan, X., Ayoko, G.A. and Frost, R.L. 2010. Heavy metal contamination in suspended solids of Changjiang River – environmental implications. Geoderma, 159: 286-295.
 Tan, W.H., Tair, R., Ali, S.A.M., Talibe, A., Sualin, F. and Payus, C. 2016. Distribution of heavy metals in seawater and surface sediment in coastal area of Tuaran, Sabah. Transactions on Science and Technology, 3: 114-122.
 Sabri, A.W., Rasheed, K.A. and Kassim, T.I. 1993. Heavy metals in the water, suspended solids and sediment of the River Tigris impoundment at Samarra. Water Research, 27: 1099-1103.
 Asokbunyarat, V. and Sirivithayapakorn, S. 2017. Distribution of mercury in water, suspended solids and sediment in Chao-Phraya River Mouth Area. Proceeding of the 4th Environment Asia International Conference, Bangkok, Thailand on June 21-23, 2017.
 Huang, Y., Zhang, D., Xu, Z., Yuan, S., Li, Y. and Wang, L. 2017. Effect of overlaying water pH, dissolved oxygen and temperature on heavy metal release from river sediments under laboratory conditions. Archives of Environmental Protection, 43: 28-36.
 Mingkhwan, R. and Worakhunpiset, S. 2018. Heavy metal contamination near industrial estate areas in Phra Nakhon Si Ayutthaya province, Thailand and Human Health Risk Assessment. International Journal of Environmental Research and Public Health, 15: 1-10.
 Chaiyara, R., Ngoendee, M. and Kruatrachue, M. 2013. Accumulation of Cd, Cu, Pb, and Zn in water, sediments, and mangrove crabs (Sesarma mederi) in the upper Gulf of Thailand. Science Asia, 39: 376-383.
 Sainz, A., Grande, J.A. and de la Torre, M.L. 2004. Characterization of heavy metal discharge into the Ria of Huelva. Environment International, 30: 557-566.