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63 Copper sulfate dIlute solutIOn DIlute 20 ml ofstock solutIOn (6 2) to 2 hters with distilled water 6.4 SodIUmhydroxidestocksolutIOn,(ION) Dissolve400gNaOHm750mldlstl1ledwater, cool and dIlute to 1 hter 65 SodIUmhydroxide(1ON) Dilute100mlofstockNaOHsolutIOn(64)to1hter 66 Hydrazme sulfate stock solutIOn Dissolve 27 5 g of hydrazme sulfate (NzH4-HzS04) m 900 ml of dtstIlled water and dtlute to 1 hter ThiS solutton IS stable for approXimately 6 months CAUTION TOXICtfmgested Markcontamerwithappropnatewarnmg 67 Hydrazme sulfate dtlute solution 671 AAI Dtlute 55 ml ofstock solution (66) to lItter 672 AAII DIlute 22 ml ofstock solutIOn (66) to 1lIter 68 Stock mtrate solution (100 mg/1 N03-N) Dtssolve 07218 g of KN03, oven dned at 100-105°C for 2 hours, m distIlled water and dIlute to 1 hter Add 1 ml chloroform as a preservattve Stablefor6months 1ml= 01mgN 6.9 Stocknitntesolutton(100mg/1NOz-N) Dtssolve06072gKNOzm500mlofdistIlled water and dtlute to 1 hter Preserve with 2 ml of chloroform and keep under refngeratlon 1ml =0 1mgN 6 10 Standard mtrate solutIOn Dilute 100 ml of stock mtrate solutton (6 8) to 1 hter 1 ml = 001 mgN 6 11 Usmg the stock mtrate solution (68), prepare the followmg standards m 100 ml volumetnc flasks At least one mtnte standard should be compared to a mtrate standard at the concentratIOn to venfy the effiCiency ofthe reductIOn Cone, mg N03-NII 05 10 20 30 40 50 80 100 ml of stock solutIon/100 ml 05 10 20 30 40 50 80 100 For standards m the range of0 01 mg/1 use the standard mtrate solutIOn 7. Procedure 7.1 Set up the mamfold as shown m Ftgure 1 (AAI) or Figure 2 (AAII) The contmuous filter must be used to remove the precipitate 72 Allow both colonmeter and recorder to warm up for 30 mmutes Obtam a stable basehne with all reagents, feedmg dIstilled water through the sample hne 73 Run a 2 0 mg/1 N03-N and a 20 mg/1 NOz-N standard through the system to check for 100% reduction ofmtrate to mtnte The two peaks should be of equal height If they are not,theconcentratIOnofthehydrazmesulfatesolutIOnmustbeadjustedasfollows Ifthe N03 peak IS lower than that of the NOz peak the concentration of hydrazme sulfate should be mcreased unttl they are equal If the N03 peak IS hlgher than the mtnte, the concentration of the hydrazme sulfate should be reduced When the correct 353 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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