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5 6 6.1 62 63 64 6 5 66 67 68 6.9 Sodmm hydroxIde, 6N DIssolve 120 g NaOH m dlstl1led water and dIlute to 500 ml Buffer DIssolve 31 g bonc aCId and 37 g potassmm chlonde m 800 ml dlst111ed water AdJustpHofsolutlOn to 92 WIth 6NNaOH (6 1) Dl1ute to 1hter Hydrochlonc aCId, 2N Dl1ute 83 ml conc HCl to 500 ml WIth dlst111ed water Zmc DIssolve 044 g ZnS04-7H20 m 100 ml2N HCI (6 3) DIlute to 1 hter WIth dlstl1led TABLE 2 Effect of Iron on NTA Recovery m RIver Water NTA Recovered, mg/l (0 5 mg/l added) 42 At concentratlOn levels below 005 mg/1 NTA, negative peakmg may occur durmg analyses Apparatus 5.1 Techmcon AutoAnalyzer conslstmg of 5 1 1 Sampler I or II 512 Mamfold 5 1 3 ProportlOmng pump 5 1 4 Colonmeter eqUIpped WIth 15 mm tubular flow cell and 600 or 625 nm filter 5 1 5 Recorder Reagents Iron Added mgll 00 05 10 20 30 40 045 50 039 water Sodmm hydroxIde, IN DIssolve 4 g NaOH m dlst111ed water and dl1ute to 100 ml ," Zmc-Zmcon reagent A (004-10 mg/I NTA) DIssolve 0065 g Zmcon powder (2- carboxy-2'-hydroxy-5'-sulfoformazyl benzene) m 2 ml of 1 N NaOH (6 5) Add 300 ml buffer (6 2) StIr on a magnetIc stIrrer and add 7 5 ml zmc solutlOn (6 4) Dl1ute to I hter WIth dIstilled water ThIs solutlOn IS stable for 12 hours -- --- Zmc-Zmcon reagent B (0 5-10 mg/I NTA) DIssolve 013 g Zmcon m 2 mil N NaOH (65). Stir on magnetic stirrer and add 300 ml buffer (6 2) and 15 ml zmc solutlOn (6 4) Dl1ute to I hter WIth dlst111ed water Stable for 1 week --- Ion-exchange resm, H+ form 20-50 mesh or 30-80 mesh, Dowex 50W-XB or eqUIvalent NOTE: Column IS prepared by suckmg a water slurry of the resm mto 12 mches of3/16- mch OD sleevmg ThIS may be convemently done by usmg a pIpette and a loose-fittmg glass wool plug m the sleeve Stock NT A solutlOn DIssolve I 0700 g of N(CH2COONa)3-H20 m 500 ml of dIstilled wateranddl1uteto 1000milO ml = 10mgNTA 4302-2 052 052 052 052 048PDF Image | Methods for Chemical Analysis of Water and Wastes
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