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~, <br />i <br /> <br /> <br />1 <br /> <br />1 <br />1 <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br />TAffiE 6 <br />rar.TrsiAmr~ ~ FIE[D ] <br />i~ramaFor GQIP_r"dl ~llbrdtlOl` <br /> <br />Dissolved Oxvg en <br />Membrane Enter the make, 1) Calibrate meter as instructed by the <br />Electrode model, serial manufacturer by air calibration. <br /> ardor ID number 2) Qieclc mvanbratte for air bubbles, wrin- <br /> for each meter kles, and holes. Charxje membrane and <br /> in a log book. KCL if nec~sazy. <br /> 3) Check leads, switch contacts, etc for <br /> corrosion and shorts if meter pointer <br /> remains off scale. <br /> <br />Electrode Enter the make, 1) Calibrate the system against two <br />Method model and/or ^tanda,.~ buffer solutions of known pH <br /> ID nwnber for value at each sampling bite. 'IY~ese <br /> each meter in a solutions should bracken the pii of the <br /> log book. sample. <br /> 2) Be on the alert for errdtic meter <br /> response arising frrm weak batteries, <br /> cracked electrode, etc. <br /> 3) Qieck response arc] linearity following <br /> highly acidic or alkaline samples. <br /> Allow time for equilibraltion. <br /> 4) Rinse electrodes thoroughly with <br /> deionized water between samples and <br /> after calibration. <br /> 5) Inspect the electrode for coating by <br /> oily materials or buildu p of solids. <br /> Either of these can imps ~r electrode <br /> response and should be removed by <br /> gentle wipirq and detergent polishing. <br />1 <br />