Laserfiche WebLink
~,~ <br />COgE LABOFlATOg1E5 <br /> <br />International - <br />..a. o..r. ~.. <br /> <br />TEST PROCEDURE <br />Humidity cell tests can be run on groups of up to twelve samples. <br />A representative 200.0 gram portion of the air-dried, minus 10 mesh <br />sample is placed in each cell. Cells are then sealed and air-line <br />hoses are securely fastened. Testing consists of a seven day cycle <br />which is repeated for a total of eight to ten weeks, depending on <br />client needs. Each weekly cycle starts by feeding day air to the <br />humidity cell for three days. Humidified air is they fed to each <br />cell on days four through six. On day seven, 200 mis of deionized <br />water is added to each cell and allowed to soak for dne hour. <br />After one hour, the sample leachate is drained into tide collection <br />beaker. Sample leachates are 0.45um filtered and ana~yzed for pH, <br />conductivity, sulfate, iron and acidity. AdditionallIparameters <br />can be analyzed, if requested, although sample leachalte volume is <br />a limiting factor. <br />OPERATING SPECIFICATIONS <br />An air flow rate of five to eight liters per minute its maintained <br />through each cell during both dry and humidified air ycles. Hose <br />clamps are utilized to aid in equalizing flow rates. F~+pproximately <br />110 to 150 mis of vaporized water pass through each cell during <br />the three day humidified air cycle. Ambient temperat res range <br />from 60 to 80 degrees fahrenheit during testing. Sample material <br />is left undisturbed for the duration of testing. <br />ANALYTICAL RESULTS <br />Analytical results for weekly sample leachates generat~d from each <br />humidity cell are reported using a standard format. n addition, <br />graphs of appropriate analytical results versus time (~ormally pH, <br />cumulative sulfate and cumulative acidity) are also r ported. <br />DISCU98ION <br />Kinetic testing used to predict acid mine drainage is ~ relatively <br />new concept. Humidity cell testing is designed to measure the rate <br />of oxidation and weathering of various soils, rock and overburden <br />samples. The normal operating specifications described above can <br />be modified to best match a particular environment. F~nalytical <br />results can also be reported in a format which betterlmeets the <br />needs of the project or client. <br /> <br />Tne NYYfee.06npn, IXineYIXYlbneCOnWrW rt Y~rport eraYUeE UponcMarreomeYtl mYMiY fuodrO Oy eM ClNrll br a.pea e.CWYweM Yule T~enm+nu Man meas rns <br />ntNIXWigneIX OYlrOre e+PefMOtepaeMnTaOeY rvo9a^a/n a1WYlYprYpMe CPe LYArYnief uYnre MlMOMYbNy na meeefMMYr RrYYeYIltiEMe e.yaff Or~mO~aO of <br />10 rni IXOOOCeMV~ OCDM OparYW er prdllYdMeM M1Pee.'er 01 Ny OI. QY' COY d GCW mNarel. ptppelry~ N:1 p W1d T cGnnacmn.T ~rlSn MILT i u ueW or ro+c ~uon ~a err reawri <br />wnewe+r <br />