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IJESD 2022 Vol.13(3): 70-76 ISSN: 2010-0264
doi: 10.18178/ijesd.2022.13.3.1374

Ecological Risk Assessment for Heavy Metals Occurrence in Rice Cultivation Areas in An Giang Province, Vietnam

Nguyen Thanh Giao

Abstract—The study was conducted to assess the occurrence and ecological risk of heavy metal concentrations (Cu, Zn, Pb, Cd and As) in the soil of paddy fields in An Giang province in 2020. Soil samples were collected at 112 locations in seven paddy fields. Cluster analysis (CA) was used to present the spatial distribution of heavy metals. Ecological potential risk index (RI) was used to determine risk levels caused by heavy metals. The results showed that Cu, Zn, Pb and As in all soil samples ranging from 1.83-124.04, 4.87-114.18, 7.87-39.22 and 4.66-16.32 mg/kg, respectively. Cd was not detected in the soil samples. All heavy metal values were within the allowable limits of Vietnamese technical regulation on heavy metals in the soils. However, Cu concentration at the rice area in An Hoa hamlet, Khanh An commune, An Phu district (D10) and As concentration at D11 (An Hoa hamlet, Khanh An commune), D33 & D36 (Hoa Ha hamlet, Kien An commune, Cho Moi district) and D38 (Phu Thuong 2 hamlet, Kien Thanh commune, Cho Moi district) exceeded the allowable limits. The CA results revealed that soil quality at 112 study sites was classified into 12 soil quality groups, possibly reducing the soil monitoring cost by 72.32%. As is the most significant contributor to potential ecological risks in soils, although RI values still showed that heavy metals pose a low risk in rice cultivation areas. However, heavy metals in soils could degrade soil quality, accumulate in agricultural commodities, and eventually humans through the food chain. Therefore, the frequency of the monitoring can be considered to increase to two or three times per year to evaluate the seasonal variation of the heavy metals.

Index Terms—An Giang, rice farming, heavy metals, potential ecological risk.

N. T. Giao is with College of Environment and Natural Resources, Can Tho University, Can Tho 900000, Vietnam (e-mail: ntgiao@ctu.edu.vn).

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Cite: Nguyen Thanh Giao, "Ecological Risk Assessment for Heavy Metals Occurrence in Rice Cultivation Areas in An Giang Province, Vietnam," International Journal of Environmental Science and Development vol. 13, no. 3, pp. 70-76, 2022.

Copyright © 2022 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

General Information

  • ISSN: 2010-0264 (Print)
  • Abbreviated Title: Int. J. Environ. Sci. Dev.
  • Frequency: Bimonthly(Since 2022); Monthly
  • DOI: 10.18178/IJESD
  • Editor-in-Chief: Prof. Richard Haynes
  • Executive Editor: Ms. Nancy Y. Liu
  • Indexing: Scopus (since 2019), Google Scholar, CNKICrossref, ProQuest, EBSCO, etc. 
  • E-mail: ijesd@ejournal.net