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METHOD 9040C <br /> pH ELECTROMETRIC MEASUREMENT <br /> start <br /> 7.1 Calibrate pH <br /> meter. <br /> 41, <br /> 7.2 Place sample <br /> or buffer solution <br /> in glass beaker <br /> 7.3 Does <br /> temperature 7.3 Correct <br /> differ by more Yes measured pH <br /> than 2C from values. <br /> buffer? <br /> No <br /> 7.4 Immerce <br /> electrodes and <br /> measure pH of <br /> sample. <br /> 7.4 Note and record <br /> PH and temperature; <br /> repeat 2 or 3 times <br /> with different <br /> aliquots. <br /> Stop <br /> 9040C - 5 Revision 3 <br /> November 2004 <br />