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(7 13 1) and mIX DIlute to mark wIth dIstIlled water and mIX agam After 40 mmutes read absorbance at 620 nm m a l cm cell NOTE 1 Some dIstIllates may contam compounds that have a chlonne demand One mmute after the addItIOn of chloramme T, test for resIdual chlonne wIth KI-starch paper If the test IS negatIve, add an addItIOnal 0 5 ml of chlorme T After one mmute, recheck the sample NOTE 2 More than 05 ml of chloramme T WIll prevent the color from developmg wIth pyndme-pyrazolone 88 Standard curve for samples WIthout sulfIde 881 Prepare a senes of standards by pipetmg sUItable volumes of standard solutIOn (79) mto 250 ml volumetnc flasks To each standard add 50 ml of 125 N sodIUmhydroxIdeanddIluteto250mlwIthdIstIlledwater Prepareasfollows ML of Work~ngStandard SolutIon Cone. /-lg CN 882 8 8 3 8 8 4 100 100 150 150 200 200 It IS not ImperatIve that all standards be dIstIlled m the same manner as the samples It IS recommended that at least two stqndards (a hIgh and low) be dIstIlled and compared to sImIlar values on the curve to msure that the dIStIl- latIon techmque IS rehable If dIstIlled standard~do not agree withm ±1O% of the undistIlled standards the analyst should fmd the cause of the apparent error before proceedmg Prepare a standard curve by plottmg absorbance of standard vs cyamde concentratIons T o check the effIcIency of the sample dIstIllatIon, add an mcrement of cyamde from eIther the mtermedlate standard (7 8) or the workmg standard (7 9) to 500 ml of sample to msure a level of 20 /-lg/l Proceed wIth the analysIs as m Procedure (8 1 1) (l ml = 10 /-lg CN) per 250 ml o BLANK 10 10 20 20 50 50 89 Standard curve for samples WIth sulfIde 89I ItISImperatIvethatallstandardsbedIstIlledmthesamemannerasthesamples Standards dIstIlled by thIS method wIll gIve a lInear curve, but as the concen- tration mcreases, the recovery decreases It IS recommended that at least 3 standards be dIstIlled 892 Prepare a standard curve by plottmg absorbance of standard vs cyamde con- centratIons 3352-5PDF Image | Methods for Chemical Analysis of Water and Wastes
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