3Gao J Z,Hu G L,Kang J W,Bai G B. 1-(2-pyridylazo) -2-naphthol (PAN) as extractant in solid- liquid extraction of some trivalent rare earth elements[J]. Talanta,2012,23:195-200.
4Zhang S,Shan X Q, Yan X, Zhang H. The determination of rare earth elements in soil by inductively coupled plasma mass spectrometry [ J ]. Atomic spectroscopy, 1997,18 (5) : 140-144.
8R. Djingova , Ju. Ivanova.Determination of rare earth ele- ments in soils and sediments by inductively coupled plasma atomic emission spectrometry after cation-exchange separa- tion, Talanta 57 (2002) 821 - 829.
9V.Balaram, Induetively coupled Plasma mass spectrometrictechniques in the elemental and isotopic analysis of lan- thanides and actinides, J Idian Chem.Soe., 2002,79 : 479.
10Guoqiang Xiang, Zuchen Jiang, Man He, Li, et al., Direct determination of trace rare earth elements in ancient porce- lain samples with slurry sampling electrothermal vaporiza- tion inductively coupled plasma mass spectrometry, Spectro- chimica Acta Part B 60 (2005) 1342-1348.