Mitigation of As accumulation in paddy rice (Oryza sativa L.) by amendments containing iron and manganese

摘要

In order to mitigate As accumulation in rice,amendments such as iron ore tailing (FeT) and manganese ore tailing (MnT) were employed in As contaminated soil.Before experiment,the toxicities of both amendments were assessed with Toxicity Characteristic Leaching Procedure (TCLP) and horizontal vibration method (HVM),respectively.The ranges of contents of As were 0.13-1.54 mg kg~(-1) in husk samples,and 0.06-0.42 mg kg~(-1) in brown rice,respectively.Among both amendments treatment,the lowest concentrations of As in rice grain were found by MnT treatment due to its structure and composition.There was significantly negative relation (p < 0.05) between Mn and As,while significantly positive relationship between Fe and As,and ratio of Fe/Mn and As in rice plant (p < 0.05).