Laserfiche WebLink
VI. ~UI:OUS GXTRAC'i'ION PROCI:DLR:GS <br />Water hxtraction of Rock InL'erburden Samples (1:11 • <br />1. Weigh 200 g. 'of prepared dry, rock sample into a suitable <br />container and add 200 m1. of boiled deionized water. <br />Adjust the added volume of c•Jater for residual moisture <br />content of sample. Shake slurry for one hour at room <br />temperature in a mechanical shaker. Record temperature. <br />2. Separate the solution extract from the soil or rock <br />sample by filtration on a Buchner funnel using a loco-ash, <br />high-retention filter paper. If filtrate shows evidence <br />of turbidit}', then refilter the solution thru clean <br />filter paper. <br />3. Record the volume of filtrate recovered. <br />4. Pleasure the pH, condu^_tivit}~ and temperature of the <br />solution. <br />5. Add five drops of 0.1% sodium hexametaphospliate solution . <br />to each extract to prevent precipitation of CaC03 from <br />the extract upon standing. <br />5. Transfer filtrate to a 250-m1 volumetric flask and <br />dilute to volume faith boiled, deionized water. <br />6. Transfer 100 ml, of the prepared filtrate into a <br />100-m1. plastic polyethylene bottle, seal and label <br />as Solution I. <br />7. Transfer the remaining 150-m1. portion of the prepared <br />filtrate into a plastic bottle, seal, and label as <br />Solution II. <br />S. Prepare a blank solution caith 200 ml. of boiled deionized <br />water and sl~al:e .for 1 hour. Add 0.5 ml. oL hexameta- <br />phosphate. Transfer to 250-m1. volumetric flasl: and <br />dilute to volume. Divide solution into two portions and <br />store in sealed polyethylene bottles. Label as blare ks. • <br />