纳米羟基磷灰石对土壤镉化学形态和水稻镉吸收的影响

采用吸附等温试验和盆栽试验，研究了nano-HAP 对镉的吸附行为和对土壤镉化学形态及水稻Cd 吸收的影响。吸附等温试验结果表明，nano-HAP 对镉离子有很高的吸附能力，且其吸附行为可用Langumir 方程和Freundlich 方程很好地描述；盆栽试验结果表明，nano-HAP 明显提高了土壤溶液中pH 值，显著降低了土壤Cd 的生物有效性，0.5%、1%和2%施用量的nano-HAP 处理下生物有效态Cd 含量分别下降63.21%、80.62%和92.32%。nano-HAP 对Cd 污染下的盆载水稻生长也有一定的促进作用，并显著降低了盆栽水稻籽粒中Cd 的含量，且全部达到国家规定的可食用标准。

Effect of nano-hydroxyapatite on Cd chemical speciationin soil and Cd accumulation in rice

The adsorption behavior of Cd on the surface of Nano-hydroxyapatite (nano-HAP) and the effect of nano-HAP on the chemical speciation of Cd in soil and the Cd accumulation in rice were studied by the adsorption isothermtests and pot experiments. The results showed that nano-HAP had a high adsorption capacity for Cd and the adsorptionbehavior could be well described by Langumir and Freundlich equations. The results of pot experiments showed that nano-HAP significantly increased the pH of soil solution and inhibited Cd bioavailability. The bioavailability of Cd concentrationin the soil decreased by 63.21%, 80.62% and 92.32% under the 0.5%, 1% and 2% nano-HAP treatments, respectively.Nano-HAP significantly reduced the Cd content in rice grain and all rice grain met the edible standards.