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Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (1): 172-177.doi: 10.11924/j.issn.1000-6850.casb15070042

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Effect of Passivation Agent on Morphology and Stability of Heavy Metals in Cropland Soil

  

  • Received:2015-07-07 Revised:2015-10-21 Accepted:2015-10-23 Online:2016-01-28 Published:2016-01-28

Abstract: Due to its low processing cost, fast effect, simple operation and no harm to crop production, passivation agent has attracted extensive attention. The common types of passivation agent include lime material, carbon material, clay minerals, phosphorus materials, organic fertilizer and so on. The application of passivation agent could change exchangeable state of heavy metals, carbonate bound state, Fe-Mn oxide bound state, organic matter binding state and residue state to reduce bio-availability. Different kinds of passivation agent had different effects on the stability of heavy metals. The passivation agent applied in high contaminated soil might be saturated by pollutants, led to a limited passivation capacity. The passivation effect became weaker with the increase of time. The effect of passivation agent on the stability uration time of heavy metal morphology still need to be studied.