H_2O_2介导的Fenton反应对砷镉污染下水稻生物量的影响

Effect of Hydrogen Peroxide Induced Fenton Reaction on Biomass of Rice in Soil Contaminated by Cd and As

采用土壤-石英砂根袋法,研究了淹水和干湿交替两种水分条件下,模拟天然降雨中微摩尔级浓度H2O2介导Fenton反应对砷镉污染土壤上水稻生长的影响。结果表明,添加砷浓度30 mg·kg-1处理组在有Fenton反应的情况下显著提高了水稻在分蘖期的干重和鲜重,在添加砷浓度30 mg·kg-1和镉浓度0.3 mg·kg-1的复合污染处理组Fenton反应也提高了水稻在成熟期的干重和鲜重,同时Fenton反应增加了添加镉浓度为0.3、3 mg·kg-1处理组的稻谷产量。模拟研究证明,H2O2介导的Fenton反应可以缓解砷、镉污染对水稻的胁迫作用,提高水稻的生物量和产量。

A pot experiment using a rhizo-bag system filled with soil and sand was conducted to investigate if rice growth was influenced by Fenton Reaction induced by hydrogen peroxide at micro molar level from simulated rain water in arsenic and/or cadmium contaminated paddy soil under all-time flooding and partial flooding. Results show that the Fenton Reaction significantly improved the dry weight and fresh weight of rice at tillering stage in the treatment with 30 mg As·kg-1soil, and at maturing stage in the treatment with both 30 mg As·kg-1soil and 0.3 mg Cd·kg-1soil. Fenton Reaction also improved the weight of rice grain in treatments with 0.3 mg Cd·kg-1soil and 3 mg Cd·kg-1soil. These findings prove that Fenton Reaction could reduce the negative impacts of arsenic and cadmium contamination on rice growth and increase rice biomass and yield.