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6 Reagents 6.1 BuffersolutIOn, pH 5 0-5 5 To approxImately 500 ml ofdIstIlled water In a 1lIter beaker add 57 ml of glacIal acetIc aCId, 58 g of sodIUm chlonde and 4 g of CDTA(2) StIr to dIssolveandcooltoroomtemperature AdjustpHofsolutIOntobetween50and55wIth 5 N sodIUm hydroxIde (about 150 ml will be reqUIred) Transfer solutIOn to a 1 lIter volumetnc flask and dIlute to the mark wIth dIstilled water For work wIth bnnes, addItIOnal NaCI should be added to raIse the chlonde level to tWIce the hIghest expected level ofchlonde In the sample 6.2 SodIUmfluonde,stocksolutIOn 10ml= 01mgF DIssolve02210gofsodIUmfluonde In dIstIlled water and dIlute to 1 lIter In a volumetnc flask Store In chemIcal-resIstant glass or polyethylene 63 SodIUm fluonde, standard SolutIon 10 ml = 001 mg F DIlute 100 0 ml of sodIUm fluonde stock solutIon (6 2) to 1000 ml wIth dIstilled water 64 SodIUm hydrQxIde, 5N DIssolve 200 g sodIUm hydroxIde In dIstIlled water, cool and dIlute to 1hter CalIbratIOn 7. 8 Procedure 7.1 Prepare a senes ofstandards USIng the fluonde standard solutIOn (63) In the range of0 to 2 00 mg/l by dIlutIng appropnate volumes to 50 0 ml The follOWIng senes may be used 72 CalIbratIon ofElectrometer Proceed as descnbed III (8 1) USIng semIloganthmic graph paper, plot the concentratIon of fluonde In mg/lIter on the log aXIS vs the electrode potentIal developed In the standard on the lInear aXIS, startIng WIth the lowest concentratIon at the bottom ofthe scale CalIbratIOn ofa selectIve Ion meter Follow the dIrectIons ofthe manufacturer for the operatIon ofthe Instrument 8 1 Place 50 0 ml ofsample or standard solutIOn and 50 0 ml ofbuffer (See Note) In a 150 ml beaker Place on a magnetIC stIrrer and mIX at medIUm speed Immerse the electrodes In the SolutIon and observe the meter readIng whIle mIXIng The electrodes must remaIn In the solutIon for at least three mInutes or untIl the readIng has stabIlIzed At concentrations under 0 5 mg/liter F, It may reqUIre as long as five mInutes to reach a stable meter readIng, hIgh concentratIons stabIlIze more qUIckly Ifa pH meter IS used, record the potentIal measurement for each unknown sample and convert the potential MIllImeters of Standard (10 ml = 001 mg/F) 000 100 200 300 400 500 600 800 1000 Concentration when Dl1uted to 50 ml, mg F/Itter 000 020 040 060 080 100 120 160 200 340 2-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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