USING MICROWAVE EXTRACTION FOR THE EVALUATION OF BIOAVAILABILITY OF RARE EARTH ELEMENTS IN SOILS
A single microwave extraction procedure was conducted to investigate the bioavailability of rare earth elements (REEs) by using different extractants of 0.05 M EDTA, 0.10 M CH_3COOH, 0.10 M HCI, and 0.05 M CaCl_2. The experimental conditions of heating time and microwave power were optimized. A microwave power of 60％ and extraction time of 30 min were adopted. Compared to the conventional single extraction schemes reported in the literature, the recommended technique shortened the operational time, simplified the experimental task, improved the precision, and obtained consistent results with those obtained by using the conventional methods. In addition, the suggested microwave extraction method has been successfully used to evaluate the bioavailability of REEs in soils. Soil samples collected from 15 sites in China were extracted by four different extractants with microwave ancillary. Extractable REEs from soils were well correlated with metals contents in shoots of wheat (Troticum aestivum L.) under greenhouse conditions. The correlation coefficients were 0.6514～0.8996, 0.4522～0.7783, 0.6506～0.8671, 0.4869～0.7014 between the extractable REEs in soils and their concentrations in wheat shoots for the extractants of CaCl_2, EDTA, CH_3COOH and HC1, respectively.
Microwave Single eztraction Rare earth elements Bioavailability
Anxiang Lu Jihua Wang Chunjiang Zhao Zhihong Ma Liangyun Liu Shuzhen Zhang
National Engineer Research Center for Information Technology in Agriculture, P.O Box 2449-26, Beijin National Engineer Research Center for Information Technology in Agriculture, P.O Box 2449-26, Beiji National Engineer Research Center for Information Technology in Agriculture, P.O Box 2449-26, Beiji National Engineer Research Center for Information Technology in Agriculture, P.O Box 2449-26, Beijin State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environme
国际会议
北京
英文
449-455
2005-10-14（万方平台首次上网日期，不代表论文的发表时间）