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7 Procedure 71 TurbIdImeter calIbratIOn The manufacturer's operatmg mstructions should be followed MeasurestandardsontheturbIdImetercovenngtherangeofmterest IfthemstrumentIS already calIbrated m standard turbIdIty UnIts, thIS procedure wIll check the accuracy of thecalIbratIOnscales Atleastonestandardshouldberunmeachmstrumentrangetobe used Some mstruments permIt adjustments of sensItIvIty so that scale values wIll correspond to turbIdIties RelIance on a manufacturer's solId scattermg standard for settmg overallmstrument sensItIvIty for all ranges IS not an acceptable practIce unless the turbIdImeterhasbeenshowntobefreeofdnftonallranges Ifapre-calIbratedscaleIS not supplIed, then calIbratIOn curves should be prepared for each range of the mstrument 72 TurbIdIties less than 40 UnIts Shake the sample to thoroughly dIsperse the solIds Wait until air bubbles dIsappear then pour the sample mto the turbIdImeter tube Read the turbIdIty dIrectly from the mstrument scale or from the appropnate calIbratIOn curve 73 TurbIdItIes exceedmg 40 umts Dilute the sample wIth one or more volumes of turbidIty- free water untIl the turbIdIty falls below 40 UnIts The turbIdIty of the ongmal sample IS then computed from the turbIdIty of the diluted sample and the dIlutIOn factor For example, If 5 volumes of turbIdIty-free water were added to 1 volume of sample, and the dIluted sample showed a turbIdIty of 30 UnIts, then the turbIdIty of the ongmal sample was 180 UnIts 73 1 The Hach Turbidimeters, Models 2100 and 2100A, are eqUIpped With 5 separate scales 0-02,0-10,0-100, and 0-1000 NTU The upper scales are to be used only as mdicators of reqUIred dilutIOn volumes to reduce readmgs to less than 40 NTU NOTE 2: ComparatIve work performed m the MDQAR Laboratory mdICates a progreSSIve error on sample turbIdIties m excess of40 UnIts CalculatIOn 8 9 PrecIsIOn and Accuracy 9 1 In a smgle laboratory (EMSL), usmg surface water samples at levels of26, 41, 75 and 180 NTU,thestandarddeVIatIOnswere ±O60, ±O94, ±12and ±47UnIts,respectIvely 9 2 Accuracy data are not avaIlable at thIS time 8 1 8 2 MultIply sample readmgs by appropnate dIlutIOn to obtam final readmg Report results as follows NTU 00 - 10 1- 10 10 - 40 40 - 100 100 - 400 400 - 1000 > 1000 Record to Nearest 005 01 1 5 10 50 100 180 1-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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