Interlaboratory quality control studies nos. 12 and 13 : aluminum, cadmium, chromium, cobalt, copper, lead, iron, manganese, nickel and zinc / J.M. Carron and K.I. Aspila.: En36-508/44E-PDF

"A report on the results of interlaboratory quality control studies No. 12 and No. 13 is given. The studies involve the analysis of aluminum, cadmium, chromium, cobalt, copper, lead, iron, manganese, nickel and zinc in natural and synthetic water samples. All metals were at concentrations similar to those found in natural waters (1-50 µg metal/l). Twelve water samples were analyzed for this combined report, including natural, fortified natural and synthetic samples. Combination of such samples provided percent recovery of trace metals from 1) synthetic standards, 2) samples fortified by participants and 3) samples fortified, but unknown, to participants. Twenty-six laboratories provided data for this combined study. Five different methodologies were used, and results for each have been summarized and in some cases, discussed. Mean values, standard deviations and percent recoveries are provided for all samples and for each method. Much of the data provided by participants were indicated as less than a designated value. Treatment of such data for computational purposes is discussed. Overall, the data provided by participants normally analyzing natural lake and river waters at low level metal concentrations (0.1-50 µg/l) were quite acceptable"--Abstract, page v.

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