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<br />IA13l.E 1 ACID MINE DRAINAGE PREDICTION TECICiIWES <br />(Continued) <br />TEST DESCRIPTION USE ADVAMAGES DIS4DVANIAGES REFERf?JCJ:S <br />3. (continued) - If PH rises then sanple ran-acid -may take several Meeks 10, 11 <br /> producer. for sartple pi to stabi- <br /> - if pH ren~ins law then sartple poten- laze <br /> tial acid producer. <br />4. Shake Flasks - Samale placed in 1 1 Erlenmeyer with infrequently used -models acid production -may be difficult to in- 7, 12 <br /> 600 ml of water or nutrient solution. for base metal and consumption reac- terpret results <br /> - Series of sartples tested at various mines in Canada bons kinetically -relatively high cost <br /> starting pH, innoculation, and tsiper- -assesses effect of -large anount of data to <br /> aUire. several contrellirg compile and interpret <br /> - Sanples incuhated for up to 3 months. conditions for AND -long time to crnpletion <br /> - Leachates analyzed weekly and bi- production of test <br /> weekly for range of parareters. -not practical for large <br /> nurber of sartples <br /> - does not consider dif- <br /> ferent grain sizes <br />5. Soxhlet -Standard Soxhlet reactor used. infrequently used -relatively sirtple to -results difficult to 13, 14 <br />Reactor -Water placed in reservoir, vaporized in coal fields of use interpret <br /> and passes into condenser. Cmdensed Appalachia USA -results available in -relationship to retural <br /> 1iq~iA drips into thimble with samale relatively short time processes not clear <br /> and thence back into the reservoir. period -still in developnent <br /> - Leachate analyzed after 64-192 Fours. -assessment of inter- stage <br /> action between acid <br /> production and consurp- <br /> tion reactions <br />6. Hmidity Cell - Sale placed in plexiglass container relatively cormwr -models acid production - as for Shake Flask test 16, 16, 17 <br /> ;.enrecteG ~ h~+i&ified air. .~ coal fields of and ~-_o.^.swption <br /> - Dry air passed over sarple for 3 days, Appalachia USA reactions kinetically <br /> hunidifieA air for 3 days and 200 ml -attempts to model wet <br /> of water addeA on seventh day. and dry cycle of envi- <br /> - Leachate reroved and analyzed for ronnerrt <br /> range of parameters <br /> - Procedure repeated for &10 reeks. <br />P <br />CUlTINJED... <br />