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pH Method 150.1 (Electrometric) STORET NO. Determined on site 00400 Laboratory 00403 1 Scope and ApphcatlOn 1 1 ThIS method IS appltcable to dnnktng, surface, and saltne waters, domestic and mdustnal wastes and aCId ram (atmosphenc depOSItiOn) 2 Summary ofMethod 2 1 The pH of a sample IS determmed electrometncally usmg eIther a glass electrode m combmatlOn wIth a reference potential or a combmatlOn electrode 3 Sample Handltng and Preservation 31 Samples should be analyzed as soon as pOSSIble preferably m the field at the tIme of samplmg 32 High-punty waters and waters not at eqUIhbnum wIth the atmosphere are subject to changes when exposed to the atmosphere, therefore the sample contamers should be filled completely and kept sealed pnor to analysIs 4 Interferences 41 The glass electrode, m general, IS not subject to solution mterferences from color, turbidity, collOidal matter, oXidants, reductants or high sahmty 42 SodIUm error at pH levels greater than 10 can be reduced or ehmmated by usmg a "low sodIUm error" electrode 43 Coatings of otly matenal or particulate matter can Imparr electrode response These coatmgs can usually be removed by gentle wtpmg or detergent washmg, followed by dlsttlled water nnsmg An additional treatment wIth hydrochlonc aCid (1 + 9) may be necessary to remove any remammg film 44 Temperature effects on the electrometnc measurement of pH anse from two sources The first IS caused by the change m electrode output at vanous temperatures ThIS mterference can be controlled with mstruments havmg temperature compensatlOn or by cahbratmg the electrode-mstrument system at the temperature of the samples The second source IS the change of pH mherent m the sample at vanous temperatures ThIS error IS sample dependent and cannot be controlled, It should therefore be noted by reportmg both the pH and temperature at the tIme ofanalySIS 5 Apparatus 5 1 pH Meter-laboratory or field model A WIde vanety of mstruments are commerCIally avatlable wIth vanous speCIfications and optIonal eqUIpment Approved for NPDES Issued 1971 Edltonal reVlSlon 1978 and 1982 1501-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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