Environmental Monitoring and Assessment

, Volume 184, Issue 7, pp 4501–4515 | Cite as

Arsenic contamination in groundwater and its possible sources in Hanam, Vietnam

  • Nguyen Minh Phuong
  • Yumei Kang
  • Katsutoshi Sakurai
  • Miyuki Sugihara
  • Chu Ngoc Kien
  • Nguyen Dinh Bang
  • Ha Minh Ngoc


This study investigated the arsenic (As) level in groundwater, and the characteristics of aquifer sediment as related to the occurrence of As in groundwater in Hanam, Vietnam. The deposition and transport of As-containing substances through rivers were also examined. Arsenic concentrations in 88% of the groundwater samples exceeded the As limit for drinking water based on the WHO standards. The dominating form of arsenic was As(III). The maximum total As content in bore core sediment was found in a peat horizon of the profiles and generally, elevated levels of As were also found in other organic matter-rich horizons. Total As contents of the bore core sediments were significantly correlated with crystalline iron oxide, silt and clay contents, suggesting that As in aquifer sediment was mainly associated with iron (hydr)oxides and clay mineral. In the groundwater, As concentration showed significant correlations with the total concentrations of Fe and HCO 3 . Significant correlations between HCl-extractable As and non-crystalline Fe oxide, total C, N, and S were also observed in the profiles. The results support the hypothesis that under favorable reductive conditions established by the degradation of organic matter, the dissolution of iron (hydr)oxides releases adsorbed As into the groundwater. The deposition of As in the sediments from the Red River were significantly higher than that in the Chau Giang River, suggesting that the Red River is the main source of As-containing substances deposited in the study area.


Arsenic Bore core Groundwater River Sediment Vietnam 



The authors thank the officers of the sampling sites and colleagues in the Faculty of Geology, Hanoi University of Science, Vietnam, for their valuable help and support with sample collection.


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Nguyen Minh Phuong
    • 1
    • 3
  • Yumei Kang
    • 2
  • Katsutoshi Sakurai
    • 2
  • Miyuki Sugihara
    • 2
  • Chu Ngoc Kien
    • 1
  • Nguyen Dinh Bang
    • 3
  • Ha Minh Ngoc
    • 3
  1. 1.United Graduate School of Agricultural SciencesEhime UniversityMatsuyamaJapan
  2. 2.Faculty of Agriculture, Kochi University, Monobe, NankokuKochiJapan
  3. 3.Faculty of ChemistryHanoi University of ScienceHanoiVietnam

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