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8 3 fil of workmg solutlOn A Cone ug/l o 00 05 500 10 1000 20 2000 50 5000 80 8000 100 10000 8 2 2 To 100 ml ofdIstIllate or an ahquot dIluted to 100 ml and/or standards, add 2 ml of buffer solutIOn (7 3) and mIX The pH of the sample and standards should be 10 ±02 8 2 3 Add 2 0 ml ammoantlpynne solutIOn (7 4) and mIX 8 2 4 Add 2 0 ml potassIUm ferncYamde solutIOn (7 5) and mIX 8 2 5 After 15 mmutes read absorbance at 510 nm Chloroform extractIOn method 8 3 1 Usmg workmg solutIOn B (7 8), prepare the followmg standards Standards may be prepared by plpettmg the reqUIred volumes lUtO the separatory funnels and dIlutmg to 500 ml WIth dIstIlled water 8 3 2 8 3 3 8 3 4 8 3 5 8 3 6 Place 500 ml of dIstIllate or an ahquot dIluted to 500 ml m a separatory funnel The sample should not contam more than 25 ug phenol To sample and standards add 10 ml of buffer solutIOn (7 3) and mIX The pH shouldbe10 ±O2 Add 3 0 ml ammoantlpynne solutIOn (7 4) and mIX Add 3 0 ml potassIUm ferncyamde solutIOn (7 5) and mIX After three mmutes, extract WIth 25 ml of chloroform (7 9) Shake the separatory funnel at least 10 tlmes, let CHCl3 settle, shake agam 10 tImes and let chloroform settle agam Vent chloroform fumes mto hood fil of workmg solutton B 00 30 50 100 200 250 Cone ug/l 00 60 100 200 400 500 8 3 7 FIlter chloroform extracts through fIlter paper Do not add more chloroform Carryout fIltratIOn m a hood 'DIspose of chloroform m envIronmentally acceptable manner 8 3 8 Read the absorbance of the samples and standards agamst the blank at 460 nm 9 CalculatIOn 9 1 Prepare a standard curve by plottmg the absorbance value of standards versus the correspondmg phenol concentratIOns 9 2 Obtam concentratIOn value ofsample dIrectly from standard curve. 4201-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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