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METHOD 9045D <br /> SOIL AND WASTE pH <br /> start <br /> 7.1 Calibrate <br /> eachinstrument/ <br /> electrode <br /> system. <br /> 7.2.1 Add 20 mL Is the 7.3.1 Add 20 mL <br /> water to 20 g soil; Soil sample soil water to 20 g waste; <br /> stir continuously or waste? stir continuously <br /> for 5 minutes. for 5 minutes. <br /> 7.2.2 Let soil 7.3.2 Let waste <br /> suspension suspension <br /> stand for 1 stand for 15 <br /> hour or filter. minutes or filter. <br /> Is waste yes Repeat experiment <br /> hydroscopic? with 20 g waste <br /> and 40 mL water. <br /> No <br /> Insert Is <br /> No supernatant yB8 Decant oily <br /> electrodes phase; <br /> into sample multiphasic? measure pH of <br /> solution. aqueous phase. <br /> Aqueous <br /> Phase <br /> Do <br /> Correct sample <br /> measured pH yes and buffer <br /> values. sol'n temps <br /> vary by <br /> 2C? <br /> No <br /> Report <br /> results and <br /> temperature <br /> Stop <br /> 9045D- 5 Revision 4 <br /> November 2004 <br />