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PIpet 5 00 ml each of SP ADNS solutIOn (5 5) and zirconyl-acid reagent (5 6) or 10 00 m1 of the mIxed aCId-zlrconyl-SPADNS reagent (57) to each standard and mlXwell Set photometer to zero wIth reference solutH;>n (58) and ImmedIately obtaIn absorbance readIngs ofstandards Plot absorbance versus concentratIon Prepare a new standard curve whenever fresh reagent IS made IfresIdual chlonne IS present pretreat the sample wIth I drop (005 ml) NaAsOz s o l u t I O n ( 5 9 ) p e r 0 1 m g r e S I d u a l c h l o r I n e a n d mI X S o d I U m a r s e m t e concentratIOnsof1300mg/1 produceanerrorof0 1mg/1 at 10mg/1 F Use a 50 ml sample or a portIon dIluted to 50 ml Adjust the temperature of the sample to that used for the standard curve Performstep622and623 71 Read the concentratIon In the 50 ml sample USIng the standard curve (6 2 4) 72 Calculate as follows mgF x 1,000 mg/l F = ml sample 73 When a sample (ml sample) IS dIluted to a volume (B) and then a portIon (C) IS analyzed, use IIF - mgF x 1,000 1!.. mg -mlsampleXC 8. PreCISIon and Accuracy 81 On a sample contaInIng 0 83 mg/1 F WIth no Interferences, 53 analysts USIng the Bellack dIstIllatIOn and the SPADNS reagent obtaIned a mean of 0 81 mg/1 F WIth a standard deVIatIonof ±O089mg/1 82 On a sample contaInIng 057 mg/1 F (WIth 200 mg/1 804 and 10 mg/1 Al as Interferences) 53 analysts USIng the Bellack dIstIllatIon obtaIned a mean of 060 mg/1F WIth a standard deVIatIon of ±O 103 mg/1 83 On a sample contaInIng 068 mg/1 F (WIth 200 mg/1 S04, 2 mg/1 Al and 25 mg/1 [Na(P03)6] as Interferences), 53 analysts USIng the Bellack dIstIllatIOn obtaIned a mean of 0.72 mg/1 F WIth a standard deViatIon of ±O 092 mg/1 (AnalytIcal Reference SerVIce, Sample 111-B water, Fluonde, August, 1961 ) BiblIography 1 Standard Methods for the EXamInatIOn of Water and Wastewater, p 389-390 (Method No 414A, PrelImInary DIstIllatIon Step) and p 393-394 (Method 414C SPADNS) 14th EdItion, (1975) 2 Annual Book of ASTM Standards, Part 31, "Water", Standard D 1179-72, Method A, p 310 (1976) 6 2 2 623 6 2 4 625 6 2 6 627 7. CalculatIons 3401-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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