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HUMIDITY CELL TESTS <br />pH of sample leochates <br />9.00 <br />8.00 <br />7.00 <br />6.00 <br />i 5.00 <br />.E <br />= 4.00 <br />a <br />v <br />°- 3.00 <br />2.00 <br />1.00 <br />0.00 <br />11 12 13 14 15 <br />TIME (weeks) <br />^ ~4 0-18(R) <br />