Effects of Carbonate on Exchangeability and Bioavailability of Exogenous Neodymium in Soil

稀土学报(英文版), 2001, 19(3): 233-237.

1.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, ChinaResource and Environment College, Southwest Agricultural University,

2.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,

3.Resource and Environment College, Southwest Agricultural University,

4.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,

基金项目: 国家自然科学基金(29890280-1)

Effects of Carbonate on Exchangeability and Bioavailability of Exogenous Neodymium in Soil

The effects of carbonate on the exchangeability and the bioavailability of exogenous neodymium in soil were studied by 147Nd isotopic tracer method. Exchangeable Nd was extracted by 1 mol*L-1 NaAc (pH8.2) in the experiment. The results indicate that whether carbonate exists in soil or not, beyond 99% of exogenous Nd is adsorbed by soil. Low-concentration carbonate (0.8～1.6 g*kg-1) can reduce exchangeable Nd concentration in soil, while high-concentration carbonate (4.0 g*kg-1) impacts little on the exchangeable Nd concentration. In addition, carbonate of 0.8～1.6 g*kg-1 in soil can inhibit wheat seedlings to absorb Nd. However, when the carbonate concentration rises to 4.0 g*kg-1, the inhibition will become indistinct.

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Effects of Carbonate on Exchangeability and Bioavailability of Exogenous Neodymium in Soil

参考文献