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A blank is to be prepared each time a fresh batch of <br />• water is used for soil extraction; one solution may serve as <br />a blank for several extraction solutions. <br />Water Extraction of Rocfc Interburden Samples (6) <br />Saturation Er.tract <br />1. Ldeigh 200 g. of prepared dry, rock sample into a <br />suitable container with a lid. Add boiled, deionized <br />water to the soil while stirring and continue the <br />addition until the soil is saturated with water. Tap <br />the container and contents on the bench top to <br />consolidate the mixture and remove air during the <br />mi>:ing stage. <br />Note: Saturation is determined by (a) observing <br />the surface of the paste mixture with reflected light <br />• which glistens when saturated and (b) the paste sliding <br />easily and cleanly off a spatula. Soils possessing <br />a high clay content are apt to be sticky and will adhere <br />to the spatula blade. <br />2. Record the quantity of coater added. <br />3. Cover the paste mixture and allow to stand for ene <br />hour. Recheck paste for saturation. ' <br />4. If the paste has become stiff or lost its glisten, <br />add more coater and mix again. Record amount of caater <br />added. If water has risen to the top surface of the <br />paste, add more soil and mix again. Record the caei;ht <br />of soil added. <br />(G) Plethnds of Soil Analysis, Part 2, Chapter G2, p. 935, <br />American 5uciety or Agronomy, Inc. (1965). <br /> <br />