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75 Carbonate-biCarbonate, standard solutIOn Prepare a senes of standards slmllar to step 73 NOTE 3: ThIS standard IS not reqUlred by some mstruments 76 Blank solutIOn Use the same dlstllled water (or slmllar quahty water) used for the preparatIOn of the standard solutIOns 8 Procedure 8 I Follow mstrument manufacturer's mstructIOns for cahbratIOn, procedure, and calculatIOns 8 2 For calIbratIOn of the mstrument, It IS recommended that a senes of standards encompassmg the expected concentratIOn range of the samples be used 9 PreclSlon and Accuracy 9 1 Twenty-eIght analysts m twenty-one laboratones analyzed dlstllled water solutIOns contammg exact mcrements ofoXIdIzable orgamc compounds, wIth the followmg results Increment as TOe mg/lIter 49 107 PrecIsion as Standard DeviatIOn TOe, mg/lIter 393 832 Accuracy as (FWPCA Method Study 3, Demand Analyses) BIblIography 1 Annual Book ofASTM Standards, Part 31, "Water", StandardD 2574-79, p469 (1976) 2 Standard Methods for the ExammatIOn of Water and Wastewater, 14th EdItIOn, p 532, Method 505, (1975) 415 1-3 BiaS, % +1527 + 101 BiaS, mg/lIter +075 +108PDF Image | Methods for Chemical Analysis of Water and Wastes
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