Abstract：
: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 CH3COOH, 0.10 M HCl, and 0.05 M CaCl2. 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 REEs contents in shoots of wheat (Troticum aestivum L.) under the 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 CaCl2, EDTA, CH3COOH and HCl, respectively.
journal_name
Chemospherejournal_title
Chemosphereauthors
Lu A,Zhang S,Shan XQ,Wang S,Wang Zdoi
10.1016/S0045-6535(03)00672-6subject
Has Abstractpub_date
2003-12-01 00:00:00pages
1067-75issue
9eissn
0045-6535issn
1879-1298pii
S0045-6535(03)00672-6journal_volume
53pub_type
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