›› 2020, Vol. 32 ›› Issue (9): 1665-1671.DOI: 10.3969/j.issn.1004-1524.2020.09.15

• Environmental Science • Previous Articles     Next Articles

Passivation effects of calcium carbonate with/without chitosan on chromium pollution in calcareous soil

CHANG Huiqing, XU Fujin, PAN Yajie   

  1. College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
  • Received:2020-03-11 Online:2020-09-25 Published:2020-10-10

Abstract: In order to explore the effective method for chromium (Cr) remediation in calcareous soil, a field experiment was carried out to study the passivation effect of calcium carbonate with/without chitosan on Cr pollution. It was shown that in the test soil, the main form of chromium was residual, which accounted for 71.28% of the total Cr content. The addition of exogenous Cr significantly (P<0.05) increased the content of various forms of Cr in soil, especially the oxidizable Cr, which accounted for more than 76% of the total Cr. While, the content of water-soluble Cr was the smallest, and the smallest number was only 0.45%. Addition of calcium carbonate with/without chitosan significantly (P<0.05) reduced the content of water-soluble Cr and significantly (P<0.05) increased the content of residual Cr. Cr-contaminated soils were passivated by addition of calcium carbonate with/without chitosan, of which the passivation rate was increased by 35.44 and 21.64 percent, respectively. The contents of malondialdehyde (MDA) and soluble protein, and catalase (CAT) activity in maize leaves were increased under Cr pollution. MDA content in maize leaves was significantly (P<0.05) decreased by 31.92% and 20.57% by addition of calcium carbonate with/without chitosan. Compared with addition of calcium carbonate alone, the addition of calcium carbonate with chitosan significantly (P<0.05) reduced Cr content in maize grains, roots and stems, and significantly (P<0.05) reduced the enrichment factor of Cr in maize grains. The present study provided method reference for the remediation of Cr contaminated calcareous soil.

Key words: calcareous soil, chromium pollution, maize, calcium carbonate, chitosan

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