USGS Method I-2030-85
Water samples for the determination ofalkalinity should not be filtered, diluted,concentrated, or altered in any way. Thedetermination should be performed withoutdelay after the sample bottle has been opened.
6.2 Set up the automatic titrator according tothe directions given in the instruction manual.6.3 From a settled, unfiltered sample, trans-fer or pipet a volume of sample to the vesselspecified by the manufacturer.6.4 Set the end point to pH 4.5 following theinstructions provided with the instrument.6.5 Place the samples in position in the titra-tion assembly and activate the automatic poten-tiometric titration, using 0.01639 astitrant. Continue titrations until all samples have been titrated.
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