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OXYGEN, DISSOLVED Method 360.1 (Membrane Electrode) STORET NO. 00299 1 Scope and ApphcatlOn l I T h e probe method for dIssolved oxygen IS lecommended for those samples contammg materIals WhICh mterfere wIth the modlfied Wmkler procedure such as sulfite, thIosulfate, polythlOnate, mercaptans, free chlorme or hypochlorIte, orgamc substances readl1y hydrolyzed m alkahne solutIOns, free IOdme, mtense color or turbIdIty and bIOlogIcal flocs 12 The probe method IS recommended as a substltute for the modIfied Wmkler procedure m momtormg of streams, lakes, outfalls, etc, where It IS desIred to obtam a contmuous record ofthe dIssolved oxygen content ofthe water under observatIOn 13 The probe method may be used as a SubstItute for the modIfied Wmkler procedure m BOD determmatlOns where It IS deslred to perform nondestructIve DO measurements on a sample 14 The probe method may be used under any CIrcumstances as a SubstItute for the modIfied Wmkler procedure provIded that the probe Itself IS standardIzed agamst the Wmkler method on samples free of mterfermg materIals 15 The e1ectromc readout meter for the output from dIssolved oxygen probes IS normally cahbrated m convement scale (0 to 10, 0 to 15, 0 to 20 mg/1 for example) wIth a sensItIvIty ofapproxImately 0 05 mg/hter 2 Summary of Method 21 The most common mstrumenta1 probes for determmatlOn of dIssolved oxygen m water are dependent upon electrochemIcal reactIons Under steady-state condItIOns, the current or potentIal can be correlated With DO concentratIOns InterfacIal dynamIcs at the probe-sample Interface are a factor m probe response and a sIgmficant degree of InterfacIal turbulence IS necessary For preClSlon performance, turbulence should be constant 3 Sample Handlmg and PreservatIOn 3 1 See 4 1,4 2, 4 3,44 under ModIfied Wmkler Method (3602) 4 Interferences 4 1 4 2 DIssolved orgamc materIals are not known to Interfere m the output from dIssolved oxygen probes Dlssolved morgamc salts are a factor m the performance ofdIssolved oxygen probe 4 2 1 Probes WIth membranes respond to partial pressure of oxygen whIch m turn IS a functIOn of dIssolved morgamc salts ConversIOn factors for seawater and brackIsh waters may be calculated from dIssolved oxygen saturatIOn versus sahmty data ConversIOn factors for specIfic morgamc salts may be developed experImentally Approved for NPDES Issued 1971 3601-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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