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0 E E2242-07 <br />S = minimum sample mass for testing, g and <br />M = moisture content, %. <br />10.8 Divide the prepared sample, if necessary, to obtain a <br />test sample suitable for processing in the column apparatus but <br />not less than the minimum sample weight from 10.7. and weigh <br />to ± 1 g. Label and reserve any excess prepared sample for any <br />additional testing which may be required. <br />10.9 Calculate the dry weight of the test sample as follows: <br />L E(100-M) <br />= Iff- (qj <br />• <br />where: <br />L = dry mass of the test sample, g, <br />E = gross mass of the test sample, g, and <br />M = moisture content of the gross sample, %. <br />11. Procedlum <br />11.1 Place filter media (7.4) in the bottom of the extraction <br />column and load the laboratory sample incrementally (-1-kg/ <br />increment) into the column. To minimize particle segregation <br />and compaction during column loading, the sample portions <br />shall be dropped from no more than 0.6 in (24 in.) when <br />introduced from the top of the column, and no tamping, <br />shaking, or other methods to compact the sample will be <br />employed. Place filter media over the test sample in the <br />column. <br />11.2 Use a water addition rate of 3.5 mumin for minimum <br />weight samples in the range of 5 to 5.5 kg dry weight. <br />11.2.1 For samples greater than 5.5 kg city weight, calculate <br />the rate of water addition to the column to pass a weight of <br />water equal to the dry weight of the test sample during the 24 <br />h test period as follows: <br />L <br />F = )a (5) <br />(• <br />where: <br />F = water addition rate, nd Jmin, and <br />L = dry mass of the laboratory sample, g. <br />11.3 Measure and record the initial temperature and pH of <br />the leaching water in accordance with Test Methods D 1293. <br />Record the time and date that water addition is started. <br />11.4 Add water to the column at the rate specified in 11.2 <br />until the weight of the effluent is equal to the dry mass of the <br />laboratory sample. If the water will not freely percolate <br />through the column, abort the test and repeat the evaluation <br />using an alternate testing procedure, such as Test Method <br />D 6234. <br />11.5 Discontinue water addition and effluent collection <br />when the effluent weight is equal to the dry weight, of the test <br />sample or 48 h has elapsed, which ever occurs first. If, after 48 <br />h, the effluent weight is not at least 70 % of the dry weight of <br />the test sample, abort the test and select an alternate testing <br />method for the sample, such as Test Method D 6234. <br />11.6 Thoroughly mix the effluent and let the column effluent <br />continue to drain into a waste container. <br />11.7 Immediately measure and record the final pH of the <br />effluent in accordance with Test Methods D 1293. Record the <br />date, time and final effluent weight. <br />11.8 Exrracr--Quantitative)y transfer a 2-1, portion of the <br />effluent through a large glass fumtel to a filtration device <br />equipped with a 0.45 Emu filter for analyses of dissolved <br />constituents. Pre-filtration using a coarse porosity glass filter <br />and centrifuge separation procedures may be necessary prior to <br />filtration for some difficult to filter effluents. Immediately <br />measure and record the final pH of the extract in accordance <br />with Test Methods D 1293. Record the final effluent and extract <br />weights. <br />11.8.1 Retain a 250-ml, portion of the extract for metals <br />analysis with its pH adjusted to less than 2 with nitric acid. <br />11.8.2 Retain a 250-mL portion of the extract for nutrients <br />analysis with its pH adjusted to less than 2 with sulfuric acid. <br />11.8.3 Retain a l-L portion of the extract for cyanide <br />analysis with its pH adjusted to between 12 and 12.5 with <br />sodium hydroxide. Store in a dark bottle at 4 °C ± 2 °C, if the <br />cyanide analysis is not performed immediately. <br />11.8.4 Refrigerate the remaining extract at 4 °C ± 2 °C for <br />mineral analyses. <br />11.9 Analyze the unfiltered effluent for specific constituents <br />or properties, or use for biological testing procedures as <br />necessary. <br />11.10 Analyses should be performed using appropriate <br />ASTM test methods. Where no appropriate ASTM test meth- <br />ods exist, other test methods may be used, such as Standard <br />Methods for the Examination of Water and Wastewater, and <br />record the methods used in the report. Whether visible phase <br />separation during storage of the extract or effluent occurs or <br />not, appropriate mixing should be used to ensure the homoge- <br />neity of the extract and effluent prior to their use in such <br />analyses or testing. <br />11.11 Allow the remaining column effluent to drain until at <br />least two minutes elapses between drops of effluent from the <br />test column. There should be no apparent free water phase in <br />the column at the end of the draining period. Record any visual <br />changes in the column residue, extract or effluent which <br />occurred during the test period. <br />11.12 Remove the test residue from the column and blend <br />by coning or rolling and obtain a sample of at least 500 g for <br />residual moisture content. Determine the residual moisture as <br />in 10.3 and record the results. Reserve the residue for any <br />additional testing required. <br />12. Report <br />12.1 Report the following information: <br />12.1.1 Source of the gross sample, date of sampling, meth- <br />ods of sampling and sample preservation, storage conditions, <br />handling procedures, and length of time between sample <br />collection and extraction; <br />TABLE 1 Stadescal atlas.-Tat Vbrilibbs <br />nem <br />Material ofLabs Vsarialm Mean MeaUniets <br />MUre Waste Rock 8 Time 27.5 Hours <br />Heap Leach Spoils 8 Time 26.7 Haul <br />Mine Waste Rock 8 Temperature 21.7 Degrees C <br />Heap Leach Spoils 8 Temperature 21.8 Degrees C <br />Mine Waste Rock 8 Volume 4.89 Liters <br />Heap Leach Spoils 8 Volume 5.05 Liters <br />Copyright by ASTM Infl (all rights reserved); Thu Jun 2615:52:01 EDT 2008 <br />Downloaded/printed by <br />Camp Dresser Mc Kee pursuant to License Agreement. No further reproductions authorized.