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TURBIDITY Method 180.1 (Nephelometric) 1 Scope and ApplIcatIOn 1 1 ThIS method IS applIcable to dnnkmg, surface, and salIne waters m the range ofturbIdIty from 0 to 40 nephelometnc turbIdIty umts (NTU) HIgher values may be obtamed wIth dIlutIOn ofthe sample NOTE 1: NTU's are consIdered comparable to the prevIOusly reported Formazm TurbIdity Umts (FTU) and Jackson TurbIdIty Umts (JTV) 2 Summary of Method 2.1 The method IS based upon a companson of the mtensity of lIght scattered by the sample under defined condItIOns wIth the mtensity of lIght scattered by a standard reference suspensIOn The hIgher the mtensity ofscattered lIght, the hIgher the turbIdIty Readmgs, m NTU's, are made m a nephelometer desIgned accordmg to specIficatIOns outlIned m Apparatus A standard suspensIOn of Formazm, prepared under closely defined condItions, IS used to calIbrate the mstrument 2 1 1 Formazm polymer IS used as the turbIdIty reference suspensIOn for water because It IS more reproducIble than other types of standards prevIously used for turbIdIty standards 2 1 2 A commercIally avaIlable polymer standard IS also approved for use for the NatIOnalInterImPnmaryDnnkmgWaterRegulatIOns ThISstandardISIdentified as AMCO-AEP A-1 avaIlable from Amco Standard InternatIOnal, Inc 3 Sample HandlIng and PreservatIOn 3 1 PreservatIOn of the sample IS not practICal, analySIS should begm as soon as pOSSIble RefngeratIOn or Icmg to 4°C, to mimmize mIcrobIOlogICal decomposItion of solIds, IS recommended 4 Interferences 41 The presence of floatmg debns and coarse sedIments WhICh settle out rapIdly wIll gIve lowreadmgs FmelydIVIdedaIrbubbleswIllaffecttheresultsmapOSItIvemanner 42 The presence of true color, that IS the color of water WhICh IS due to dIssolved substances WhICh absorb lIght, wIll cause turbIdIties to be low, although thIS effect IS generally not sIgmficant WIth fimshed waters 5 Apparatus 5 1 The turbIdImeter shall conSIst of a nephelometer WIth lIght source for Illummatmg the sample and one or more photo-electnc detectors WIth a readout deVIce to mdicate the mtensity of lIght scattered at nght angles to the path of the mCIdent lIght The turbIdImeter should be so deSIgned that little stray lIght reaches the detector m the Approved for NPDES and SDWA Issued 1971 Editonal reVISIon 1974 Editonal reVISIOn 1978 180 1-1 STORET NO. 00076PDF Image | Methods for Chemical Analysis of Water and Wastes
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