Losses of Ag from solution by adsorption on to borosilicate glass and polyethylene sample containers are reported. In distilled water over 80 of a 1 #x3BC;g AgI#x2212;1solution may be adsorbed within 11 days. Acidification to 0.3M HNO3satisfactorily preserved samples for this length of time and allowed direct analysis of Ag by graphite furnace atomic absorption spectrometry or pre-concentration by solvent extraction. Filtration through 0.45 #x3BC;m membranes may bias the dissolved versus suspended partitioning of Ag in freshwaters in favour of the latter, by adsorption of soluble Ag.
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