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ACIDITY Method 305.1 (Titrimetric) 1 Scope and Apphcatl0n 11 ThIs method IS apphcab1e to surface waters, sewages and mdustna1 wastes, partlCularly mme dramage and recelvmg streams, and other waters contammg ferrous Iron or other polyvalent catlOns m a reduced state 12 The method covers the range from approxImately 10 mg/1 aCIdIty to approxImately 1000mg/1asCaC03, usmga50mlsample 2 Summary of Method 2 1 The pH ofthe sample IS determmed and a measured amount ofstandard aCId IS added, as needed, to lower the pH to 4 or less Hydrogen peroxIde IS added, the solutlOn bolled for several mmutes, cooled, and titrated electrometncally WIth standard alkah to pH 8 2 3 DefimtlOns 3 1 ThIs method measures the mmeral aCIdIty of a sample plus the aCIdIty resultmg from oXldatlOn and hydrolysIs ofpolyvalent catlOns, mc1udmg salts ofIron and alummum 4 Interferences 41 Suspended matter present m the sample, or precIpItates formed dunng the titratlOn may cause a sluggIsh electrode response ThIS may be offset by allowmg a 15-20 second pause between addItIons of titrant or by slow dropWIse addItion of titrant as the endpomt pH IS approached 5 Apparatus 5 1 pH meter, smtable for electrometnc titratlOns 6 Reagents 61 Hydrogen peroxIde (H20 2, 30% solutlOn) 62 Standard sodmm hydroxIde, 0 02 N 63 Standard sulfunc aCId, 0 02 N 7 Procedure 71 PIpet 50 ml of the sample mto a 250 ml beaker 72 Measure the pH ofthe sample Ifthe pH IS above 4 0, add standard sulfunc aCId (6 3) m 50mlmcrementstolowerthepHto40orless IfthemltialpHofthesampleISlessthan 4 0, the mcremental addltlOn ofsulfunc aCId IS not reqmred 73 Add5dropsofhydrogenperoxIde(6 1) 74 Heat the sample to bOllmg and contmue bOlhng for 2 to 4 mmutes In some mstances, the concentratlOn of ferrous Iron m a sample IS such that an addItional amount of hydrogen peroxIde and a shghtly longer bollmg tIme may be reqmred Approved for NPDES Issued 1971 Techmcal reVlSlOn 1974 305 1-1 STORET NO. 70508PDF Image | Methods for Chemical Analysis of Water and Wastes
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