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64 Ammomumchlonde,standardsolutIon 10ml=001mgNHrN DIlute100mlofthe stock solutIOn (63) to 1 lIter wIth dIstilled water (6 1) m a volumetnc flask NOTE 1: When analyzmg salme waters, standards must be made up m synthetIc ocean water (SOW), found m NItrogen, Ammoma Colonmetnc, Automated Phenate Method (3501) 7 Procedure 7 1 Preparation of standards Prepare a senes of standard solutIons covenng the concentratIon range of the samples by dIlutmg eIther the stock or standard solutIons of ammomum chlonde 72 CalIbratIOn of electrometer Place 100 ml of each standard solutIOn In clean 150 ml beakers Immerse electrode mto standard of lowest concentratIOn and a,dd 1 m1 of lON sodIUm hydroXIde solution whIle mIXIng Keep electrode m the solutIOn untIl a stable readIng IS obtaIned NOTE 2: The pH ofthe solutIOn after the addItIOn ofNaOH must be above 11 CautIon SodIUm hydroXIde must not be added pnor to electrode ImmerSIOn, for ammoma may be lost from a baSIC solutIOn 73 Repeat thIS procedure WIth the remaInIng standards, gOIng from lowest to hIghest concentratIOn USIngsemIloganthmicgraphpaper,plottheconcentratIOnofammomaIn mg NH3-N/1 on the log aXIS vs the electrode potentIal developed In the standard on the Imear axIS, startmg WIth the lowest concentratIOn at the bottom ofthe scale 7.4 CalIbratIOn of a speCIfic IOn meter Follow the dIrectIOns of the manufacturer for the operatIon ofthe mstrument 75 Sample measurement Follow the procedure In (72) for 100 ml of sample In 150 ml beakers Record the stabIlIzed potentIal of each unknown sample and convert the potentIal readIng to the ammoma concentratIOn usmg the standard curve If a speCIfic Ion meter IS used, read the ammoma level dIrectly m mg NH3-N/1 8. PreCISIon and Accuracy 81 In a SIngle laboratory (EMSL), usmg surface water samples at concentratIOns of 1 00, 077,019, and 013 mg NH3-N/1, standard deVIatIOns were ±O 038, ±O 017, ±O 007, and ±O003,respectIvely 82 In a SIngle laboratory (EMSL), USIng surface water samples at concentratIOns of 0 19 and o13 mg NHr N/1, recovenes were 96% and 91 %, respectively BIblIography 1. Booth, R L , and Thomas, R F , "SelectIve Electrode DetermInatron of Ammoma In Water and Wastes", EnVIr SCI Technology, 7, p 523-526 (1973) 2. Banwart, W L, Bremner, J M, and TabatabaI, M A, "DetermInatIOn ofAmmomum m SoIl Extracts and Water Samples by an Ammoma Electrode", Comm SoIl SCI Plant ,3,p 449 (1952) 3. MIdgley, D, and Torrance, K, "The DetermmatIOn of Ammoma In Condensed Steam and BoIler Feed-Water WIth a PotentIOmetnc Ammoma Probe", Analyst, 97 p 626-633 (1972) 3503-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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