关键词: 轻稀土元素;生物可利用性;萃取;一元回归

Abstract:

Single extraction procedures with low molecular weight organic acids (LMWOAs), sodium salts of LMWOAs, DTPA, EDTA, CaCl2 and NaNO3 as extracts were performed to extract light rare earth elements La, Ce, Pr and Nd from plant root wet rhizhosphere soil. The bioavailability of light rare earth elements from maize root is evaluated by single regression analysis. The results showed that light rare earth elements adsorbed by plant root cell wall and taken up by cross-membrane were utilizable, and the total content of rare earth elements in plant root can be used for predicting bioavailability. For the prediction of bioavailability of light rare earth elements in maize root and leaves, different extracts had different effects. LMWOAs, sodium salts of LMWOAs and DTPA were quite good extracts for predicting bioavailability of light rare earth elements uptake by maize root（significant at 0.10 probability level at least）. Neutral salts CaCl2 and NaNO3 were also good extracts for predicting bioavailability of light rare earth elements uptake by maize leaf   significant at 0.10 probability level at least）. In contrast, the correlation coefficients with maize root or leaf were poor when EDTA was used as extract.

Key words: light rare earth elements, bioavailability, extraction, single regression