介孔硅纳米颗粒对水稻镉吸收的影响

Effect of mesoporous silica nanoparticles on Cd accumulation in rice

采用盆栽试验研究了介孔硅纳米颗粒(MSN)对水稻Cd吸收的影响。结果表明,MSN提高了土壤溶液的p H值,从而显著降低了土壤Cd的生物有效性,施用量为0.5%、1.0%和2.0%的MSN处理组土壤有效态Cd含量分别下降63.07%、81.30%和93.02%。MSN对Cd污染土壤上水稻生长也有一定的促进作用,显著降低了盆栽水稻籽粒中Cd的含量,0.5%、1.0%和2.0%MSN处理组水稻籽粒中Cd含量从0.363 mg/kg分别下降到0.045 5、0.032 5、0.020 7 mg/kg,均达国家标准。因此,介孔硅纳米颗粒可用于镉污染土壤的修复治理。

The effects of mesoporous silica nanoparticles（ MSN） on the Cd accumulation in rice were investigated by pot experiments. The results showed that MSN significantly increased the p H of soil solution and inhibited Cd bioavailability. Soil available Cd concentration in soil decreased by 63. 07%,81. 30% and 93. 02% under the 0. 5%,1. 0% and 2. 0% MSN treatments,respectively. MSN significantly reduced the Cd content in rice grain. The Cd content of fresh rice sample decreased from 0. 363 mg/kg to 0. 045 5 mg/kg,0. 032 5 mg/kg and 0. 020 7 mg/kg under the 0. 5%,1. 0% and 2. 0% MSN treatments,respectively. The Cd content in all rice grain met the edible standards. It was concluded that MSN could be used to restore Cd contaminated soil.