Research Article Open Access

Environmental Risk Assessment of Coal-Ash-Amended Soil Based on Continuous Planting of Pakchoi

Wenxuan Sun1, Liyong Bai1, Huihui Ji1, Wentao Huo2, Zhen Huang1, Kezhong Liu1 and Dongyun Yan1
  • 1 Qingdao University, China
  • 2 The First Company of China Eighth Engineering Bureau, China

Abstract

The agricultural application of coal ash which contains a variety of chemical nutrients may also cause heavy metal pollution of crops and soil. In this study, pakchoi was cultivated for four consecutive seasons in pots of brown soil amended with fly ash or bottom ash. With subsequent plantings, the total concentrations in the four fractions of Pb, Cr and Cu decreased, while the concentrations of Pb, Cr and Zn dissolved in acetic acid increased. The lowest fresh weight of pakchoi were seen when 15% fly ash was applied. The edible parts of pakchoi contained more heavy metals than the roots. Calculating the Nemerow Pollution Index (NPI) according to the Environmental Protection Standards, the risk of heavy metals in coal ash-amended soils was low. With subsequent plantings, the Risk Assessment Code (RAC) of Pb, Cr and Zn increased gradually and Zn eventually reached a medium level. The study confirmed that coal ash had phytotoxic effects on pakchoi and application of coal ash confered a risk of soil pollution.

American Journal of Biochemistry and Biotechnology
Volume 17 No. 2, 2021, 192-204

DOI: https://doi.org/10.3844/ajbbsp.2021.192.204

Submitted On: 15 March 2021 Published On: 11 May 2021

How to Cite: Sun, W., Bai, L., Ji, H., Huo, W., Huang, Z., Liu, K. & Yan, D. (2021). Environmental Risk Assessment of Coal-Ash-Amended Soil Based on Continuous Planting of Pakchoi. American Journal of Biochemistry and Biotechnology, 17(2), 192-204. https://doi.org/10.3844/ajbbsp.2021.192.204

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Keywords

  • Bottom Ash
  • Environmental Risk Assessment
  • Fly Ash
  • Pakchoi
  • Heavy Metal