Two methods are presented for a fast, accurate and precise determination of210Pb in industrial samples with a calcium-phosphate and-sulphate matrix. One method combinessolid-liquid extraction on a Pb-selective column Sr*Spec (Eichrom) with gamma-ray spectrometry of210Pb and can be applied to samples >10 g for aselective210Pb determination. The yield is determined gravimetrically. The detection limit is 380 mBq for a 24 h counting period. The other method combineschromatography on Sr*Spec with liquid scintillation counting of210Pb for asensitive210Pb determination and can be applied to samples of up to 1 g. The yield is determined on-line by the UV signal of PbEDTA. The detection limit is 70 mBq for a 2 h counting period. Aspects of accuracy, precision, selectivity, sensitivity and the application of both methods to phosphogypsum and phosphate ores are presented.
Authors:P. Tjioe, K. Volkers, J. Kroon, and J. De Goeij
This study deals with the quantitative determination of eight REE's viz, La, Ce, Nd, Sm, Eu, Tb, Yb, and Lu as an Integral
part of a post-irradiation chemical separation scheme for the determination of 14 trace elements in biological materials.
REE values are given for NBS Orchard Leaves SRM 1571, NBS Bovine Liver SRM 1577 and Bowen's Kale, as well as for some other
biological (reference) materials of plant, animal and human origin.
Chondritic-normalized REE patterns of these materials are discussed. It is shown that differentiations in REE-pattern between
soil and plant may occur, and also that within the human body different modes of fractionation of REE's take place.