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ALKALINITY Method 310.2 (Colorimetric, Automated, Methyl Orange) STORET NO. 00410 1 Scope and ApphcatIOn 1 1 ThIs automated method IS apphcable to dnnkmg, surface, and sahne waters, domestIc and mdustnal wastes The apphcable range IS 10 to 200 mg/l as CaC03 12 ThIs method IS not an approved NPDES method as cIted m the Federal RegIster December 1, 1976 for samples contammg tUlbldlty or color 2 Summary of Method 2 1 Methyl orange IS used as the mdlcator m thIS method because ItS pH range IS m the same range as the eqUlvalence pomt for total alkahmty, and It has a dlstmct color change that can be easIly measured The methyl orange IS dIssolved m a weak buffer at a pH of 3 1, Just below the eqUlvalence pomt, so that any addItIon of alkahmty causes a loss of color dIrectly proportIOnal to the amount ofalkahmty 3 Sample Handhng and PreservatIOn 3 1 Sample should be refngerated at 4°C and run as soon as practtcal Do not open sample bottle before analysIs 4 Interferences 4 1 Sample turbIdIty and color may mterfere Wlth thIS method TurbIdIty must be removed by filtratIon pnor to analysIs If sample IS filtered, thIS method IS not approved for NPDES momtonng Sample color that absorbs m the photometnc range used WIll also mterfere 5 Apparatus 5 1 Techmcon AutoAnalyzer conslstmg of 5 1 1 Sampler I 512 Mamfold 5 I 3 Proportl0mng pump 5 1 4 Colonmeter eqUlpped WIth 15 mm tubular flow cell and 550 nm filters 5 1 5 Recorder eqUlpped WIth range expander 6 Reagents 61 Methyl Orange DIssolve 0 125 g ofmethyl orange m lItter ofdlsttlled water 62 pH 3 1 Buffer DIssolve 5 1047 g of potassmm aCId phthalate m dIstIlled water and add 876ml0 1NHCIanddIluteto1hter Stableforoneweek 63 Methyl Orange-Buffered IndIcator Add 1 hter of pH 3 1 buffer (6 2) to 200 ml methyl orange solutIOn (6 1) and mIX well Stable for 24 hours 64 StockSolutIon DIssolve1060gofanhydroussodmmcarbonate(oven-dnedat250°Cfor 4 hours) m dIstIlled water and dIlute to 1000 m ilO ml = 1 00 mg CaC03 Approved for NPDES Issued 1971 Edltonal reVISion 1974 310 2-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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