Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (1): 100-107.doi: 10.11924/j.issn.1000-6850.casb20200200152

Previous Articles     Next Articles

Effect of Different Passivation Materials on Arsenic in Farmland Soil

Huang Anlin1(), Liu Guihua2, Chai Guanqun2, Fan Chengwu2, Fu Guohua1, Qin Song2()   

  1. 1Institute of Ecology and Environment, Hainan University, Haikou 570228
    2Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006
  • Received:2020-02-11 Revised:2020-05-06 Online:2021-01-05 Published:2020-12-25
  • Contact: Qin Song E-mail:490661351@qq.com;qs3761735@163.com

Abstract:

Different ratios of passivation materials were added to the arsenic contaminated farmland soil in Karst area of Guizhou to evaluate their effectiveness of immobilizing arsenic, aiming to provide references for the remediation of contaminated farmland soil. The effects of passivation agents on soil pH, effective As and passivation rate were analyzed by adding 12 passivation agents of different proportions. Iron ore powder, steel slag and coal cinder in the 6 inorganic passivation materials could effectively reduce the content of effective state As in the farmland soil. Applying coal cinder had the best effect and could reduce the soil pH by 0.01-0.16 units. The passivation rate of different additions was 34.58%-56.33%. Among the 6 organic materials, the content of As in the soil with humus increased first and then decreased, and the soil pH did not change significantly. The passivation rate of different additions reached 40.96%-44.08%. Thus, iron ore powder, steel slag, coal slag and humus could reduce the soil pH and stabilize the bioavailability of As in the farmland soil, considering the material input cost, steel slag and coal slag are more suitable for remediation of heavy metal contaminated farmland soil.

Key words: passivation materials, farmland soil, arsenic, heavy metal speciation, passivation rate

CLC Number: