Neutron activation analysis (NAA) was used to determine the concentration of trace elements in 44 precious and 52 common opals sampled from a number of recognised fields within Australia. The purpose of this study was to determine if precious and common opals of the same colour and location have the same or a different trace element profile. Similar numbers of black, white and grey samples were studied in each case. In most cases common opals had a significantly higher concentrationof certain trace elements when compared with precious opals.
Authors:A. Grimanis, M. Vassilaki-Grimani, and G. Griggs
Seventeen trace elements (As, Ce, Co, Cr, Cs, Eu, Fe, Hg, Hf, La Lu, Rb, Sb, Sc, Sm, Yb and Zn) have been determined by Instrumental
Neutron Activation Analysis in sediments from the upper Saronikos Gulf, Greece. It was found that the discharge of industrial
and domestic wastes in the Keratsini and Elefsis bays of the upper Saronikos Gulf had led to elevated concentrations of all
toxic and other trace elements determined over at least 100 km2 of seafloor. Increases above natural level range from 2 fold for rare earths to 200 fold for arsenic.
Authors:Li-Yun Jin, G. Capannesi, L. Renzi, and F. Sedda
A study of trace elements in hair samples from two children of different sex on different sampling dates has been carried out using INAA. Using several combinations of irradiation, cooling and counting times, about thirty elements were quantitatively determined. Some conclusions could be drawn from the data obtained.
The concentration of 24 trace elements in the tobacco of two different brands of Iranian cigarettes, “Zarrin” and “Oshnoo”,
has been measured by neutron activation analysis employing a high-resolution Ge(Li) detector. These elements are: Na, K, Sc,
Cr, Mn, Fe, Co, Zn, Se, Br, Rb, Ag, Sb, Cs, Ba, La, Ce, Sm, Eu, Tb, Hf, Au, Hg and Th.
Twenty trace elements and heavy metals of Dalat lake sediment were analyzed by neutron-activation analysis at the ASTRAREACTOR. The elaborated method was also controlled by analyzing the reference material for lake sediment SL-1 of IAEA. It showed a good agreement with the certified values for most of the elements. The relative errors ranged from 1% to 25%.
Fifty five samples were analysed for 10 trace elements by INAA. In the absence of identified samples of known origin, similarities
between the samples were established by constructing a minimal spanning tree based on 5 selected elements. Thereafter grouping
was tested using concentration, sum of concentration, and normalised concentration indices. From the results, tentative patterns
of population movement can be deduced.
Authors:W. Żmijewska, H. Polkowska-Motrenko, and H. Stokowska
Two methods of concentration of Ag, As, Cd, Co, Cr, Cu, Fe, Hg, In, Mo, Mn, Sb, Sc, Se, W and Zn from water have been elaborated. The trace elements are preconcentrated by coprecipitation with thionalide at pH 9, 1 and 0 or by sorption on ion exchange resin Dowex 1×2 loaded with 8-hydroxyquinoline-5-sulfonic acid at pH 7.
Authors:K. Kostic, R. Draškovic, M. Ratkovič, and D. Kostić
In our biological investigations some trace elements have been determined by instrumental radioactivation analysis in organs
of normal rats. The results of trace element distribution of Cr, Zn, Br, Sb, Fe, Co, Sc, Ag and Na in liver, spleen, brain,
lung, kidney and heart of normal rats are presented in the paper.
The promotion of radioanalysis as an elegant, predominantly instrumental, analytical method is a major achievement of Vincent
P. Guinn. As an example the sequential analysis for trace elements in the mm-range of small “pure” silica components from
the electronic industry of various, often irregular, shapes is presented here. The idea reaches back to our discussions in
the early seventies.
The concentration of 20 trace elements in nine different brands of Turkish cigarette tobacco and in a brand of pipe tobacco
and in tobacco ash has been determined by instrumental neutron activation analysis. The percent transference of elements into
smoke has been estimated from the amounts remaining in the ash.