University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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NRC GBW 07234

Classification: Reference Material -> NRC -> GBW 07234 -> Copper ore

Citations 1

"Determination Of Rare Earth Elements In Geological Samples By Inductively Coupled Plasma Atomic Emission Spectrometry With Flow Injection Liquid-Liquid Extraction"
Anal. Sci. 2003 Volume 19, Issue 12 Pages 1625-1629
Zhifang Xu, Congqiang Liu, Hongxiang Zhang, Yingjun Ma And Soulin Lin

Abstract: A direct sampling with organic solvent extracts for simultaneous multi-element determination implemented with inductively coupled plasma atomic emission spectrometry (ICP-AES) associated with a flow injection liquid-liquid extraction (FI-LLE) sample pre-concentration method was studied. The "robustness" of the plasma discharge with tributyl phosphate (TBP) loading was diagnosed by using the Mg II 279.55 nm and Mg I 285.21 nm lines intensity ratio. A FI-LLE pre-concentration system for rare earth elements (REEs)-nitrate-TBP was established by using a laboratory-designed phase separator. For these elements, an average sensitivity enhancement factor of 64 was obtained with respect to ICP-AES sampling with aqueous solutions. The precision of the method was characterized by a relative standard deviation (%RSD) of 1.8 - 5.2%. A throughput of 27 samples per hour can be achieved with an organic solvent consumption of less than 200 µl per determination. Good results were obtained for the analysis of standard reference materials.
Lanthanum Neodymium Samarium Europium Erbium Ytterbium Yttrium Spectrophotometry Extraction Optimization