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4 3 Broad vanatlOns m the kmds and concentrations of salts m samples can make the use of a membrane probe dIfficult ReactIve compounds can mterfere wIth the output or the performance of dIssolved oxygen probes 44 DIssolved oxygen probes are temperature sensItive, and temperature compensatlOn IS normally proVIded by the manufacturer Membrane probes have a temperature coeffiCIent of4 to 6 percentl'C dependent upon the membrane employed 4 3 1 Reactive gases whIch pass through the membrane probes may mterfere For example, chlonne WIll depolanze the cathode and cause a hIgh probe-output Long-term exposures to chlonne WIll coat the anode wIth the chlonde of the anode metalandeventuallydesenSItIzetheprobe AlkalmesamplesmWhIChfreechlonne does not eXIst WIll not mterfere Hydrogen sulfide wIll mterfere wIth membrane probes If the apphed potentIal IS greater than the half-wave potential of the sulfide Ion If the apphed potentIal IS less than the half-wave potentIal, an interfermg reactIon wIll not occur, but coatmg of the anode wIth the sulfide of the anode metal can take place 5 Apparatus 5 1 No speCIfic probe or accessory IS especIally recommended as supenor However, probes WhICh have been evaluated or are m use and found to be relIable are the Weston & Stack DO Analyzer Model 30, the Yellow Spnngs Instrument (YSI) Model 54, and the Beckman Fleldlab Oxygen Analyzer 6. CalIbration Follow manufacturer mstructlOns 7. Procedure Follow manufacturer mstructIons 8. CalculatIon Follow manufacturer mstructlons 9. PrecISIonandAccuracy Manufacturer's specificatlOn claIm °1mg!1repeatabIlItyWIth ±1%accuracy BIblIography 1 Standard Methods for the ExammatlOn of Watet and Wastewater, 14th EdItion, p 450, Method 422F (1975) 360 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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