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1 <br />1 <br />1 <br />1 <br /> <br />' Dissolved C»cvcren <br />Membrane <br />' Electrode <br /> <br />1 ~ <br /> Electrode <br /> Method <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br />TAffiE 6 <br />Og FIE[D IIa'I4~ffi7I'A'PIQi <br />Enter the make, <br />model, serial <br />and/or ID number <br />for each meter <br />in a log book. <br />Enter the make, <br />model and/or <br />ID number for <br />each meter in a <br />log book. <br />C:cLllbR3tlon <br />1) Calibrate meter as instnicted by the <br />manufacturer by air calibration. <br />2) Check membrane for air bubbles, wrin- <br />kles, and holes. C>>ange membrane and <br />KCL if necessary. <br />3) Check leads, switch contacts, etc for <br />corrosion and shorts if meter pointer <br />remains off scale. <br />1) Calibrate the systsn against two <br />atarr3arr7 buffer solutions of knarn pH <br />value at each sampling site. 'These <br />solutions should bracket the pH of the <br />sample. <br />2) Be on the alert for ertatic meter <br />response arising fran creak batteries, <br />cracked electrode, etc. <br />3) Check response and linearity following <br />highly acidic or allmline samples. <br />Allan time for equilibkation. <br />4) Rinse electrodes thorotx~ily with <br />deionized water between sales arri <br />after calibration. <br />5) Inspec.'t the electrode for coating by <br />oily materials or buildup of solids. <br />Either of these can impair electrode <br />response and should be removed by <br />gentle wiping and deteYgent polishing. <br />fi <br />