Comparison of rare earth element geochemistry and Nd isotopes in two adjacent tropical estuaries: Van Uc and Cam-Nam Trieu, Northern Vietnam
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DOI:
https://doi.org/10.15625/1859-3097/22329Keywords:
Dissolved rare earth element, Neodymium isotopic composition, Gd anomaly, Van Uc estuary, Cam-Nam Trieu estuaryAbstract
Concentrations of rare earth elements (REE) were measured in surface waters collected from the Van Uc and Cam estuaries, from the inner river to the estuarine transition zone. Additionally, the neodymium isotope composition (Nd-IC) of two river water samples was analyzed to compare the two adjacent rivers under different geochemical conditions and anthropogenic influences. Water samples were preconcentrated using Nobias® resin prior to REE analysis by Sector Field-ICP-MS, while Nd-IC measurements were performed on a Thermal Ionization Mass Spectrometer (TIMS) after several treatments. The total REE concentrations (ƩREE) in the Van Uc estuary ranged from 10.5 to 23.6 nmol/kg, significantly higher than those in the Cam-Nam Trieu estuary, which ranged from 2.14 to 6.34 nmol/kg. Both Van Uc and Cam riverine and estuarine water are enriched in the middle REE (MREE) relative to light REE (LREE), with depletion observed in heavy REE (HREE) when normalized to shale compositions. No negative cerium anomalies (Ce*/Ce) were observed in any sample, reflecting the predominance of riverine influence in the estuarine mixing zone. Gadolinium anomalies (Gd*/Gd) were uniformly positive but low (≤ 1.3), implying minimal inputs from gadolinium-based MRI contrast agents or sufficient dilution to suppress detectable anthropogenic Gd signals. Nd-IC of the Van Uc water was εNd = -10.5 while of Cam-Nam Trieu water was less radiogenic, with εNd = -11.3.
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[1] V. Piton, S. Ouillon, V. D. Vinh, G. Many, M. Herrmann, and P. Marsaleix, “Seasonal and tidal variability of the hydrology and suspended particulate matter in the Van Uc estuary, Red River, Vietnam,” Journal of Marine Systems, vol. 211, 103403, 2020.
[2] V. D. Vinh, S. Ouillon, T. D. Thanh, and L. V. Chu, “Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta,” Hydrology and Earth System Sciences, vol. 18, no. 10, pp. 3987–4005, 2014.
[3] V. D. Vinh and S. Ouillon, “The double structure of the Estuarine Turbidity Maximum in the Cam–Nam Trieu mesotidal tropical estuary, Vietnam,” Marine Geology, vol. 442, 106670, 2021.
[4] K. Binnemans, P. T. Jones, B. Blanpain, T. Van Gerven, Y. Yang, A. Walton, and M. Buchert, “Recycling of rare earths: a critical review,” Journal of Cleaner Production, vol. 51, pp. 1–22, 2013.
[5] H. J. de Baar, C. R. German, H. Elderfield, and P. Van Gaans, “Rare earth element distributions in anoxic waters of the Cariaco Trench,” Geochimica et Cosmochimica Acta, vol. 52, no. 5, pp. 1203–1219, 1988.
[6] A. H. Osborne, B. A. Haley, E. C. Hathorne, Y. Plancherel, and M. Frank, “Rare earth element distribution in Caribbean seawater: Continental inputs versus lateral transport of distinct REE compositions in subsurface water masses,” Marine Chemistry, vol. 177, pp. 172–183, 2015.
[7] A. E. Floback and J. W. Moffett, “Rare earth element distributions in the Arabian Sea reveal the influence of redox processes within the oxygen deficient zone,” Chemical Geology, vol. 577, 120214, 2021.
[8] Z. Qudsi, A. O. Mucci, H. Dang, Y. Gélinas, and G. Chaillou, “Contrasting rare earth element concentrations and mixing behaviors in the St. Lawrence Estuary and Saguenay Fjord,” Marine Chemistry, vol. 258, 104336, 2024.
[9] J. Schijf and R. H. Byrne, “Speciation of yttrium and the rare earth elements in seawater: Review of a 20-year analytical journey,” Chemical Geology, vol. 584, 120479, 2021.
[10] G. Bayon, C. R. German, K. W. Burton, R. W. Nesbitt, and N. Rogers, “Sedimentary Fe–Mn oxyhydroxides as paleoceanographic archives and the role of aeolian flux in regulating oceanic dissolved REE,” Earth and Planetary Science Letters, vol. 224, no. 3–4, pp. 477–492, 2004.
[11] H. T. Nguyen, L. Gourdon, H. V. Bui, D. T. Dao, H. Mai, H. M. Do, T. V. Nguyen, and S. Ouillon, “Ecological responses of meiofauna to a saltier world—A case study in the Van Uc River Continuum (Vietnam) in the dry season,” Water, vol. 15, no. 7, 1278, 2023.
[12] V. D. Vinh, S. Ouillon, and D. Van Uu, “Estuarine Turbidity Maxima and variations of aggregate parameters in the Cam–Nam Trieu estuary, North Vietnam, in early wet season,” Water, vol. 10, no. 1, 68, 2018.
[13] M. Lagarde, V. Q. Pham, P. Lherminier, M. Belhadj, and C. Jeandel, “Rare earth elements in the North Atlantic, part I: Non-conservative behavior reveals margin inputs and deep waters scavenging,” Chemical Geology, vol. 664, 122230, 2024.
[14] V. Q. Pham, M. Grenier, S. Cravatte, S. Michael, S. Jacquet, M. Belhadj, Y. Nachez, C. Germineaud, and C. Jeandel, “Dissolved rare earth elements distribution in the Solomon Sea,” Chemical Geology, vol. 524, pp. 11–36, 2019.
[15] D. Yeghicheyan, D. Aubert, M. Bouhnik-Le Coz, J. Chmeleff, S. Delpoux, I. Djouraev, G. Granier, F. Lacan, J. L. Piro, T. Rousseau, C. Cloquet, A. Marquet, C. Menniti, C. Pradoux, R. Freydier, E. V. da Silva-Filho, and K. Suchorski, “A new interlaboratory characterisation of silicon, rare earth elements and twenty-two other trace element concentrations in the natural river water certified reference material SLRS-6 (NRC-CNRC),” Geostandards and Geoanalytical Research, vol. 43, no. 3, pp. 475–496, 2019.
[16] A. Bouvier, J. D. Vervoort, and P. J. Patchett, “The Lu–Hf and Sm–Nd isotopic composition of CHUR: constraints from unequilibrated chondrites and implications for the bulk composition of terrestrial planets,” Earth and Planetary Science Letters, vol. 273, no. 1–2, pp. 48–57, 2008.
[17] V. Q. Pham, C. Jeandel, M. Grenier, S. Cravatte, G. Eldin, M. Belhadj, C. Germineaud, and T. V. Vu, “Neodymium isotopic composition and rare earth element concentration variations in the Coral and Solomon Seas,” Frontiers in Environmental Chemistry, vol. 3, 803944, 2022.
[18] S. M. McLennan, “Rare earth element geochemistry and the ‘tetrad’ effect,” Geochimica et Cosmochimica Acta, vol. 58, no. 9, pp. 2025–2033, 1994.
[19] H. Khuong The, P. Nguyen, T. C. Nguyen, N. S. Pham, and D. T. Nguyen, “Identifying correlation of coal seams in the Tien Hai Area, Northern Vietnam by using multivariate statistic methods,” Inżynieria Mineralna, no. 2, pp. 129–148, 2021.
[20] A. M. Amorim, F. F. Sodré, T. C. Rousseau, and P. D. Maia, “Assessing rare-earth elements and anthropogenic gadolinium in water samples from an urban artificial lake and its tributaries in the Brazilian Federal District,” Microchemical Journal, vol. 148, pp. 27–34, 2019.
[21] V. Hatje, K. W. Bruland, and A. R. Flegal, “Determination of rare earth elements after pre-concentration using NOBIAS-chelate PA-1® resin: Method development and application in the San Francisco Bay plume,” Marine Chemistry, vol. 160, pp. 34–41, 2014.
[22] V. Hatje, K. W. Bruland, and A. R. Flegal, “Increases in anthropogenic gadolinium anomalies and rare earth element concentrations in San Francisco Bay over a 20 year record,” Environmental Science & Technology, vol. 50, no. 8, pp. 4159–4168, 2016.
[23] N. Tepe, M. Romero, and M. Bau, “High-technology metals as emerging contaminants: Strong increase of anthropogenic gadolinium levels in tap water of Berlin, Germany, from 2009 to 2012,” Applied Geochemistry, vol. 45, pp. 191–197, 2014.
[24] M. Bau and P. Dulski, “Anthropogenic origin of positive gadolinium anomalies in river waters,” Earth and Planetary Science Letters, vol. 143, no. 1–4, pp. 245–255, 1996.
[25] S. Kulaksız and M. Bau, “Anthropogenic gadolinium as a microcontaminant in tap water used as drinking water in urban areas and megacities,” Applied Geochemistry, vol. 26, no. 11, pp. 1877–1885, 2011.
[26] L. Ma and W. X. Wang, “Dissolved rare earth elements in the Pearl River Delta: Using Gd as a tracer of anthropogenic activity from river towards the sea,” Science of the Total Environment, vol. 856, 159241, 2023.
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