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ALKALINITY Method 310.1 (Titrimetric, pH 4.5) 1 Scope and ApphcatlOn STORET NO. 00410 1 1 1 2 1 3 2 1 An unaltered sample IS tItrated to an electrometncally determmed end pomt of pH 4 5 The sample must not be filtered, dlluted, concentrated, or altered m any way 3 Comments 31 The sample should be refngerated at 4°C and run as soon as practICal Do not open sample bottle before analysIs 32 Substances, such as salts of weak orgamc and morgamc aCIds present m large amounts, may cause mterference m the electrometnc pH measurements 33 For samples havmg hIgh concentratlOns of mmeral aCIds, such as mme wastes and assocIated recelvmg waters, titrate to an electrometnc endpomt of pH 39, usmg the procedurem Annual Book of ASTM Standards, Part 31, "Water", p 115, D-1067, Method D, (1976) 34 011 and grease, by coatmg the pH electrode, may also mterfere, causmg sluggIsh response 4 Apparatus 41 pH meter or electncally operated tltrator that uses a glass electrode and can be read to o05 pH UllltS StandardIze and cahbrate accordmg to manufacturer's mstructlOns If automatICtemperaturecompensatlOnISnotprOVIded,maketItratlOnat25 ±2°C 42 Use an appropnate SIzed vessel to keep the aIr space above the solutlOn at a ml111mum Use a rubber stopper fitted WIth holes for the glass electrode, reference electrode (or combmatlOn electrode) and buret 43 MagnetIC stIrrer, pIpets, flasks and other standard laboratory eqmpment 44 Burets, Pyrex 50, 25 and 10 ml 5 Reagents 5 1 Sodmm carbonate solutlOn, apprOXImately 0 05 N Place 2 5 ±O 2 g (to nearest mg) Na2C03 (dned at 250°C for 4 hours and cooled m deSIccator) mto a 1 hter volumetnc flask and dl1ute to the mark Approved for NPDES Issued 1971 Edltonal reVlSlOn 1978 ThIS method IS apphcable to dnnkmg, surface, and sahne waters, domestIc and mdustnal wastes The method IS smtable for all concentratIOn ranges of alkahmty, however, appropnate ahquots should be used to aVOId a tltratl0n volume greater than 50 ml Automated tltnmetnc analysIs IS eqmvalent 2 Summary of Method 310 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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