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<br />~' <br />1 <br /> <br />' Parameter <br />' Dissolved Oxwen <br />Membrane <br />Electrode <br />1 <br />Electrode <br />1 ~ <br />Method <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br />TA6CE 6 <br />~ Fffia lISII~ffi~il'A'IZQi <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 />Calibration} <br />1) Calibrate meter as inst~vcted by the <br />manufacturer by air ibration. <br />2) Check membrane for air les, wrin- <br />kles, and holes. membrane and <br />KCL if necessary. <br />3) Check leads, switch contacts, etc for <br />corrosion and shorts ifs meter pointer <br />remains off scale. <br />1) Calibrate the system against two <br />standa*r7 buffer solutio#~s of known pH <br />value at each sampling ite. Rhese <br />solutions should bracke the pH of the <br />sale. <br />2) Be on the alert for exw tic meter <br />response arisittl frrun batteries, <br />cracked electrode, etc. <br />3) Chec]c ~sponse and 1' ity following <br />hic~ly acidic or alkali~6e sales. <br />Allow time for equilib tion. <br />4) Rinse electrodes tho y with <br />deionized water between sales and <br />after calibration. <br />5) Inspect the electrode f r coating by <br />oily materials or build~p of solids. <br />Either of these can it electrode <br />response and should be ~enrrved by <br />gentle wiping and detetc~ent polishing. <br /> <br />