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0 E 2242 - 07 <br />Figure 2. Laboratory Worksheet <br />Sample Description: <br />Moisture sample after drying, g _ <br />Moisture sample before drying, g _ <br />Drying temperature and time, _ <br />Moisture Content, % : = <br />Sieve retained weight (+5 cm), g <br />Sieve passing weight (-5 cm), g <br />Retained percent (+5 cm):= <br />Wet test sample, g : = <br />Dry test sample, g : = <br />Rate of water addition, mL/min : = <br />pH of extraction water : = <br />Extraction time and temperature: = <br />pH of final effluent : = <br />Final effluent, g : = <br />Filter type and pore size: _ <br />pH of extract _ <br />Extract, g : _ <br />Residue sample after drying, g _ <br />Residue sample before drying, g _ <br />Drying temperature and time, _ <br />Residue moisture, °s _ <br />Observations: <br />FIG. 2 Laboratory Worksheet <br />methods with single analyses for duplicate test materials, rather <br />than three or more test portions with triplicate analyses, <br />because of the decision to perform most of the analytical work <br />in one central laboratory. The objective of the test was not to <br />measure the precision of the analytical methods but to deter- <br />mine the precision of the column extraction procedure. The <br />Practice E 691 computer program was used to calculate the <br />statistics. <br />13.1.1 The analyses conducted immediately by the indi- <br />vidual laboratories showed precision in the quantitative range <br />with the exception of acidity and dissolved solids for the mine <br />waste rock, which exceeded the quantitative limit for R of <br />50 %. Many of the solution analyses conducted by the central <br />laboratory could not be used for statistical purposes, since they <br />were reported to be below detection. The precision of many <br />analyses in the central laboratory also were not within the <br />quantitative range even at relatively high concentrations, so the <br />user of this method is cautioned to interpret the analyte <br />concentrations in the extracts as a qualitative, not quantitative <br />indication of the presence of those analytes at the concentra- <br />tions measured. The heterogeneity and particle size distribution <br />of the test samples may strongly influence the precision of this <br />test method. <br />13.2 Bias-No information on the accuracy of this test <br />method is known because suitable reference materials were not <br />available for testing during the interlaboratory study. The user <br />6 <br />Copyright by ASTM InVI (all rights reserved); Thu Jun 26 15:52:01 EDT 2008 <br />Downloaded/printed by <br />Camp Dresser Mc Kee pursuant to License Agreement. No further reproductions authorized.