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N. M. Sorokina, G. I. Tsysin
X-ray fluorescence determination of
lanthanum, cerium, praseodymium and neodymium in technological solutions after
preconcentration using cellulose DETATA-filters
Abstract
Sorption of some rare earth elements was
studied on filters with bound DETATA-groups. It was shown that these elements
are quantitatiuvely recovered from solutions at pH 3.5–5.5 and sample flow rate
1-8 ml/min from 20–500 ml of sample. For recovery of elements from solutions
containing iron, we have proposed to use masking reagents – sulfosalicylic acid
and 1,10-phenantroline. Elements were determined directly on filters by X-ray
fluorescence spectroscopy. Calibration dependencies are linear in concentration
range 2–100 µg/filter of each REE. Limits of detection for La, Ce, Pr and Nd,
calculated according 3s-criterion, were 0,03; 0,03; 0,01 and 0,01 µg/ml
respectively when extraction was performed from 100 ml of sample.
Key words: rare earth elements,
filters-sorbents, determination, X-ray fluorescence method, technological
solutions.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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