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NTA Method 430.2 (Colorimetric, Automated, Zinc-Zincon) STORET NO. 00695 1 Scope and ApphcatlOn , 11 In thIS method, NTA refers to the tn-sodium salt of mtnlotnacetIc aCId, N(CH2COONa)3 , 1 2 ThIS method IS apphcable to surface waters In the range of 0 04 to 1 0 mg/l and 0 5 to 10 0 mg/l NTA, dependIng on WhICh manIfold syst~mIS used It does not apply to sahne waters, a posItIve Interference of0 5 to 1 0 mg/lls present In sewage-type samples. 1 3 ApproXImately 13 samples per hour can be analyzed 2 Summary ofMethod(l) 2 1 ZInC forms a blue-colored complex wIth 2-carboxy-2'-hydroxy-5'-sulfoformazylbenzene (ZIncon) In a solutIOn buffered to pH 9 2 When NTA IS addd, the ZInc-Zmcon complex IS broken WhICh reduces the absorbance In proportIon to the amount of the NTA present 3 Sample Handhng and PreservatIOn I 3 1 Samples should be analyzed as soon as pOSSIble, as NTA has been shown to be bIodegradable (2) 4 Interferences 41 CatIons, such as calCIUm, n1a~neSlUm, ZInC, copper,' Iron, and manganese, complex wIth NTA and gIve a negatIve Interference These Ions are removed automatIcally by pasSIng the sample through an lOn-exchange column At concentratIOns hIgher than expected In typICal nver waters,(3) only Iron was not completely; removed by thIS column treatment Results, summanzed In Tables 1 and 2, show that 'Iron gIves a negatIve Interference In concentratIOnsabove30mg/l NTA Issued 1971 TABLE 1 Interference of Common Metals mg/l Metal added Blank 00 Zmc 20 Iron 50 Manganese 4 0 Copper 0 5 Recovenes 1~0 mg/l 10 09 08 10 12 50 mg/l NTA 50 49 38 49 49 4302-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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