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5. 6 Apparatus 5 1 Shakmg machme, tray type, for stIrnng sample-resm mIxtures m 125 ml Erlenmeyer flasks 5 2 Photometer, sUitable for measurements at 620 nm Reagents 7. Procedure 7.1 72 7 3 7 4 8. 9 7 5 CalculatIon 8.1 Prepare standard curve by plottmg absorbance of standards vs NTA concentratIons 1 2 Thompson, J E , and DuthIe, J R , "The BIOdegradabIlIty and Treatment of NT A", Jour WPCF, 40, No 2,306 (1968). Shumate, K S et aI, "NTA Removal by ActIvated Sludge - FIeld Study", IbId, 42, No 4, 631 (1970) 6 1 6.2 6 3 64 6 5 66 6 7 68 SodiUm hydroxIde, 6N DIssolve 120 g NaOH m distIlled water and dIlute to 500 ml Buffer DIssolve 31 g bonc aCId and 37 g potassiUm chlonde m 800 ml dIstIlled water Adjust pH to 9 2 wIth 6N NaOH (6 1) DIlute to 1 lIter Hydrochlonc aCId, 2N DIlute 83 ml conc HCl to 500 ml wIth dIstIlled water Zmc DIssolve 044 g ZnS04-7H20 m 100 ml 2N HCl (63) and dIlute to 1 lIter wIth dIStIlled water SodiUm hydroxIde, IN DIssolve 4 g NaOH m dIstIlled water and dIlute to 100 ml Zmc-Zmcon DIssolve 0 13 g Zmcon (2-carboxy-2'-hydroxy-5'-sulfoformazyl benzene) m 2 mllN NaOH (65) Add 300 ml buffer (62) WhIle stlrnng, add 15 ml Zmc SolutIon (6 4) and dIlute to 1 lIter wIth dIstIlled water Ion-exchange resm Dowex 50W-X8, 50-100 mesh, Na+ form (or eqUivalent) Stock NTA solutIOn DIssolve 10700 g N(CH2COONa)3-H20 m dIstIlled water and dIlutetol000ml 1Oml= 10mgNTA FIlter approxImately 50 ml ofwell-mIxed sample through a 0 45u membrane filter Prepare a senes of standards from 0 5 to 10 mg/l NTA, Includmg a blank of dIstIlled water Treat standards and blank In same manner as filtered samples To a 25 ml sample m a 125 ml Erlenmeyer flask add approXImately 2 5 g lon-exchange resm(67) Agttatesampleforatleast15mmutes FIlter through coarse filter paper to remove resm PIpette 15 0 ml of filtrate Into a 50 ml beaker Add 25 0 ml Zmc-Zmcon (6 6) by pIpette Read absorbance agamst dIstIlled water at 620 nm In a 1 cm or 2 cm cell Calculate concentratIons ofNTA, mg/l, dIrectly from thIS curve PrecISIon and Accuracy 9 1 9 2 In a smgle laboratory (MDQARL), USIng spIked surface water samples at concentratIons of0 5, 2, 6, and 10 mg/l NTA, standard devIatIOns were ±O 17, ±O 14, ±O 1, and ±O 16, respectIvely In a smgle laboratory (MDQARL), usmg spIked surface water samples at concentratIons ofl 0 and 75 mg/l NTA, recovenes were 120% and 103%, respectIvely BiblIography 4301-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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