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&EPA United States Environmental Protection Agency Research and Development Test Method Environmental Monitoring and Support Laboratory CinCinnati OH 45268 Acidity (Titrimetric)- Method 305.2 1 Scope and Application 1 1 This method IS applicable to rain, surface and other waters of pH less than 83 1 2 This method IS a measure of the concentration of strong and weak aCids that react With hydroxyl IOns This Includes the dissolved gases that are present 1 3 The range of this method depends on the volume of sample titrated and upon the precIsion that the Increments of titrant can be measured If only 10 mL of sample IS available for analYSIS It IS necessary to use a 50 pL syrmge for dispenSing the titrant In order to achieve a precIsion of less than 10 peq/L 2 Summary of Method 2 1 Samples are titrated With 0 02 N carbonate free NaOH solution The end pornt IS determined With a pH meter Results are reported as mlcroeqUivalents (peq) per liter 3 Samplmg Handling and Storage 3 1 The sample container must be filled completely, sealed and stored at 4°C Care must be taken to minimIze exposure of the sample to the atmosphere Open the sample container Immediately before analySIS 32 AnalYSIS should be performed as soon as possible after collection 4 Comments 4 1 Samples With an initial pH between 4 3 and 8 3 are subject to error due to the loss or gam of dissolved gases dunng sampling storage and analyses 30521 Dec 1982 5 Apparatus pH meter and electrode(s), see 5 1 Method 150 1 or 150 2 Micro buret or micro synngs Teflon or glass magnetic stirring Magnetic stirrer Beakers or flasks Reagents 6 2 Standard sodium hydroXide titrant, 002 N Dilute 200 mL of 1 N NaOH With CO2-free distilled water to 1 liter Store In rubber stoppered bottle Protect from atmosphenc CO 2 by uSing a soda lime tube Standardize against an 0 02 N potasSium aCid phthalate solution prepared by dissolVing 4 085 g of anhydrous KHCaH40 4 In CO2 free distilled water and diluted to 1 1 7 Procedure 7 1 Pipet an appropnate aliquot of sample Into beaker of flask containing a small teflon on glass stirring bar Use extreme care to minimiZe the sample surface disturbance 5 2 5 3 bar 5 4 5 5 6 Standard sodium hydrOXide 6 1 solution, 1 N Dissolve 40g NaOH In 250 mL distilled water Cool and dIlute to 1 liter With CO2 free distilled water Store In a polyolefm bottle and fitted With a soda lime tube or tight cap to protect from atmosphenc CO2PDF Image | Methods for Chemical Analysis of Water and Wastes
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