Other
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40.1359e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 11, pp.1359-1374
Other
Scientific paper
The I.A.G.C. international programme of interlaboratory comparison of water analysis quality involved seven waters, including surface waters, a ground water, an alkaline spring water, a sample `spiked' with heavy metals, and a geothermal water. Forty-eight laboratories in eighteen countries participated. Sample stability was little problem for most major solutes and for minor elements at concentrations greater than tens of ppb. Iron analyses were erratic for some samples, and the stability of nitrogen species was suspect in unsterilized samples. For major constituents in surface waters the results were of reasonable quality but for waters of unusual composition e.g. the geothermal and alkaline spring water, the results were far from satisfactory. Of the common constituents, SO 4 , NO 3 , F, and SiO 2 showed the greatest range of results. The most consistent results for trace elements at the 10 ppb level were for Be, Cd, Cu, Hg, and Li. Lower quality results (coefficient of variation over 30) were obtained for Fe, As, Mn, Co, Ni, Pb and Zn.
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