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FLUORIDE Method 340.2 (Potentiometric, Ion Selective Electrode) STORET NO: Total 00951 Dissolved 00950 1 Scope and ApplIcatiOn 11 ThIS method IS applIcable to the measurement of fluonde m dnnkmg, surface and sahne waters, domestic and mdustnal wastes 12 ConcentratiOn of fluonde from 0 1 up to 1000 mg/lIter may be measured 13 For Total or Total DIssolved Fluonde, the Bellack dIstIllatiOn is reqUired for NPDES momtonng but is not reqUired for SDWA momtonng 2 Summary of Method 21 The fluonde IS determmed potentiOmetncally usmg a fluonde electrode m conjUnctIon WIth a standard smgle Junction sleeve-type reference electrode and a pH meter havmg an expanded mIllIvolt scale or a selectIve Ion meter havmg a dIrect concentratiOn scale for fluonde 22 The fluonde electrode conSIsts of a lanthanum fluonde crystal across whIch a potentIal IS developed by fluonde Ions The cell may be represented by Ag/Ag Cl, ct(O 3), F"(O 001) LaF/test solutiOn/SCE/ 3 Interferences 3 1 Extremes of pH mterfere, sample pH should be between 5 and 9 Polyvalent catiOns of 33 SI+4, Fe+ and Al+ mterfere by formmg complexes With fluonde The degree of mterference depends upon the concentratiOn of the complexmg catIons, the concentratIon of fluonde and the pH of the sample The addItIon of a pH 5 0 buffer (descnbed below) contammg a strong chelatmg agent preferentIally complexes alummum (the most common mterference), SIlIcon and iron and elImmates the pH problem 4 SamplIng HandlIng and PreservatiOn 4 1 No specIal reqUirements 5 Apparatus 51 52 53 5 4 Electrometer (pH meter), WIth expanded mv scale, or a selectIve iOn meter such as the Onon 400 Senes Fluonde Ion ACtIVity Electrode, such as Onon No 94-09(1) Reference electrode, smglejUnctlon, sleeve-type, such as Onon No 90-01, Beckman No 40454,orCormngNo 476010 Magnetic MIxer, Teflon-coated stlrnng bar Approved for NPDES and SDWA Issued 1971 Edltonal reViSIon 1974 3402-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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