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constant, metered flow of distilled water to the columns was built. The <br />constant flow drip system was built from a peristaltic pump equipped <br />with nine metered pump tubes with flow rates of 25 ml per hour. Three <br />C foot lengths of Tygon tubing with inside diameters of 2.5 mm were <br />attached to the pump tubes. The delivery ends of the Tygon tubing were <br />suspended 25 mm above each column. Distilled water, with an electrical <br />1 conductivity of less than 2 umhos/cm @ 25°C, was pumped through the <br />tubing and delivered into the column. Flow rates of water for several <br />C samples were required to be reduced due to less leachate volume being <br />obtained versus the volume of water being added to the column. In these <br />samples, sufficient water was kept in the column to keep the leach <br />C sample covered. <br />[ Collection and Measurement <br />~. After the leach samples in the columns became saturated with water and <br /> leachate began to flow into the collection flasks, leachate fractions <br />- were collected every two hours. Volume and electrical conductivity <br /> measurements were made on the collected fractions. <br /> The fractions were then poured into one sample bottle for each leach <br /> column. The leaching process continued until the electrical <br /> conductivity readings for five consecutive fractions changed less than <br /> 30 umhos/cm @ 25°C. The leaching process varied in the amount of time <br /> for completion for each sample. This variation was dependent upon the <br /> texture of the sample and the amount of salts in the sample. <br /> <br />+ Graphing of Leachate Analytical Data <br /> hi <br />l <br />h <br />d <br />f th <br />d <br />h <br />l <br />t <br />O <br /> s were ma <br />a <br />eac <br />ng process was comp <br />ete, grap <br />e o <br />e <br />a <br />nce t <br />e <br /> obtained from the leaching process. These graphs, found in Tables 3 <br /> through 11, Column Leach Analysis Data, compare electrical conductivity <br /> in umhos/cm @ 25°C of leachate fractions collected every two hours <br />L versus the volume of accumulated leachate per sample weight in ml/g of <br />' sample. These graphs also contain miscellaneous information regarding <br /> the leaching process. <br />L _4_ <br />