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(a) most sets involve some type of fire assay pre-concentration/ (b) the data includes sets using titration and e/ectrogravimetric methods/ (c) the data includes sets using instrumental techniques such as atomic absorption spectrometry,inductively coupled plasma - optical emission spectrometry, inductively coupled plasma - mass spectrometry, X-ray fluorescence, and, for copper only, instrumental neutron activation analysis/ (d) samples of 1 to 10 grams were dried for 1 to 60 hours at 100 to 110°C/ (c) sets using digestion by two acids (hydrochloric and nitric) or three acids (hydrochloric, nitric and hydrofluoric) were excluded as method outliers based on statistical tests/ (f) the data includes sets using titration, electrogravimetric and dimethylglyoxime methods (g) digestion using four acids (hydrochloric, nitric, hydrofluoric and perchloric), various fusion and combustion methods were used/ (h) all sets used a fusion for the preparation