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- Author or Editor: I. Drabaek x
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Abstract
The analysis of EDTA or DTPA complexed In, Dy, Sm and La hydrospheric tracers at ng/l level in sea water as well as fresh water, employing coprecipitation and neutron activation analysis has been evaluated. Laboratory experiments were performed for one month to examine the effect of (i) sediments plus suspended particulates, (ii) suspended particulates and (iii) ‘pure’ water on the chelated tracers. Only condition (i) affected the tracers, causing an immediate loss of 10% of In-and Dy-DTPA, 15% of Sm-DTPA and as much as 50% of La-DTPA. After this instantaneous loss, no decay of the tracer complexes was observed during the rest of the experiment.
Abstract
A method for the determination of mercury, arsenic and selenium by neutron activation analysis is described. Radiochemical separations are performed by selective distillation followed by electrolysis of mercury on gold and precipitation of arsenic and/or selenium by reduction to the elemental form. The chemical yields are 80–90% for mercury and 90–100% for arsenic and selenium. Interference tests have been carried out with reference to those elements most likely to interfere with the analysis. Detection limits for mercury, arsenic and selenium using 0.1 g of sample are 0.2 ng g–1, 2 ng g–1 and 3 ng g–1, resp. Detection limits can be improved using greater sample size and neutron flux density. Results from the analysis of several NBS standard reference materials are given.
Abstract
Results for the content of the rare earth elements (REE), La, Ce, Nd, Sm, Eu, Tb, Yb and Lu in sediments, mussels and fish are presented for an area polluted by REE. The REE are emitted with the process waste water stream from a fertilizer production plant. The method of analysis has been INAA. An attempt to combine the INAA with a simple destruction/preconcentration method is described.
