Trace toxic elements in agricultural soil and sediment in the biggest estuarine area, northern Vietnam

  • Nguyen Van ThinhEmail author
  • Akinori Ozaki
  • Yasuhito Osanai
  • Kiyoshi Kurosawa


Soil quality, especially its toxic elements content, plays an important part in clarifying the sustainability of an estuarine ecosystem. In this study, six toxic elements (As, Pb, Cd, Zn, Cr, Cu) in soils and sediments of the Ba Lat estuary, northern Vietnam, were assessed using the ICP-MS technique. Soil properties, such as major minerals, soil particles, organic carbon content, were also measured using an X-ray diffractometer (XRD) system and other common methods. The FE-EPMA technique was applied to explore the surface chemical properties of the soil and sediment particles. Detailed information about arsenic and heavy metal forms in the samples was analyzed by the sequential extraction method. Sixty-seven surface soil and sediment samples were collected. In addition, several soil and sediment cores (1 m of depth) were also taken from mangrove forests and paddy fields to evaluate their toxic element content. The chemical analyses have shown that the surface layers of the river sediment and mangrove forest soil contain accumulated As and heavy metals, which could have been transported from the upstream Red River. The average concentrations of heavy metals (Pb, Cd, Zn, Cr, Cu) did not exceed the allowable limit for agricultural soil; however, these elements tend to accumulate on the surface layer of the soil and sediment profiles. The spatial distribution of the toxic elements suggests that intensive human activities in the upstream Red River in recent decades were the cause of elevated levels of these toxic elements in the estuarine ecosystem of Ba Lat estuary.


Arsenic Heavy metals Agricultural soil Estuarine ecosystem ICP-MS FE-EPMA 



The content of this paper is part of the PhD thesis of Nguyen Van Thinh, who received a scholarship from MEXT during his doctoral course at Kyushu University. The authors express their grateful thanks to Prof. Do Nguyen Hai, Prof. Nguyen Huu Thanh, Mr. Tho Hoang Nguyen, Mr. Anh Nguyen Duc and Mr. Tran M Chau in the Vietnam National University of Agriculture for their corporation and advice during the field survey in Vietnam.


  1. Akai J, Izumi K, Fukuhara H, Masuda H, Nakano S, Yoshimura T, Ohfuji H, Md Anawar H, Akai K (2004) Mineralogical and geomicrobiological investigations on groundwater arsenic enrichment in Bangladesh. Appl Geochem 19:215–230. CrossRefGoogle Scholar
  2. Edwards CA (1991) Advances in soil science. Volume 11: soil degradation. R. Lal, B. A. Stewart. Q Rev Biol 66:224–225. Google Scholar
  3. MONRE—Ministry of Natural Resources and Environment of The Socialist Republic of Vietnam (2015) National environmental current status report, in the period 2011–2015 (Vietnamese), p 243Google Scholar
  4. Nguyen TTH, Zhang W, Li Z, Li J, Ge C, Liu J, Bai X, Feng H, Yu L (2016) Assessment of heavy metal pollution in Red River surface sediments, Vietnam. Mar Pollut Bull 113:513–519. CrossRefGoogle Scholar
  5. Ohfuji H, Boyle AP, Prior DJ, Rickard D (2005) Structure of framboidal pyrite: an electron backscatter diffraction study. Am Miner 90:1693–1704. CrossRefGoogle Scholar
  6. Phuong NM, Kang Y, Sakurai K, Iwasaki K, Kien CN, Noi N, Son LT (2009) Levels and Chemical Forms of Heavy Metals in Soils from Red River Delta, Vietnam. Water Air Soil Pollut 207:319–332. CrossRefGoogle Scholar
  7. The Guardian (2016) Vietnam blames toxic waste water from steel plant for mass fish deaths. Guard. 2016–2018Google Scholar
  8. The Ministry of Natural Resources and Environment (MONRE) (2015) National technical regulation on the allowable limits of heavy metals in the soilsGoogle Scholar
  9. Tóth G, Hermann T, Da Silva MR, Montanarella L (2016) Heavy metals in agricultural soils of the European Union with implications for food safety. Environ Int 88:299–309. CrossRefGoogle Scholar
  10. Tue NT, Quy TD, Amano A, Hamaoka H, Tanabe S, Nhuan MT, Omori K (2012) Historical profiles of trace element concentrations in Mangrove sediments from the Ba Lat Estuary, Red River, Vietnam. Water Air Soil Pollut 223:1315–1330. CrossRefGoogle Scholar
  11. USEPA—United States Environmental ProtectionAgency (1996) Method 3050B: acid digenstion of sediments, sludges and soilsGoogle Scholar
  12. Vu QM, Le QB, Frossard E, Vlek PLG (2014) Socio-economic and biophysical determinants of land degradation in Vietnam: an integrated causal analysis at the national level. Land Use Policy 36:605–617. CrossRefGoogle Scholar

Copyright information

© The International Society of Paddy and Water Environment Engineering 2019

Authors and Affiliations

  • Nguyen Van Thinh
    • 1
    • 2
    Email author
  • Akinori Ozaki
    • 1
  • Yasuhito Osanai
    • 3
  • Kiyoshi Kurosawa
    • 1
  1. 1.Institute of Tropical AgricultureKyushu UniversityFukuokaJapan
  2. 2.Consulting Center of Technological Sciences for Natural Resources and EnvironmentVietnam National University of AgricultureHanoiVietnam
  3. 3.Faculty of Social and Cultural StudyKyushu UniversityFukuokaJapan

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