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HUMIDITY CELL TESTS <br />pH of sample leachates <br />7. <br />6. <br />5. <br />N <br />~ <br /> 4. <br /> <br />7 <br />2 <br />a <br />x 3. <br />a <br /> 2. <br /> 1. <br /> 0. <br />70 72 74 76 <br />^ q5 0-18 (UR) <br />TIME (weeks) <br />