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7 Procedure 6.13 6.14 6 15 6 16 Standard nItrate solutlOn DIlute 10 0 ml of nItrate stock solutlOn (612) to 1000 ml wIth dIstilled water 1 0 ml = 001 mg N03-N Stock nItrIte solutIon DISsolve 6072 g KN02 In 500 ml of dIstilled water and dIlute to 1000 ml Preserve wIth 2 ml of chloroform and keep under refngeratlOn Stable for approXlmately3months 10ml = 100mgN02-N Standard nItnte solutlOn DIlute 10 0 ml of stockpitnte solutlOn (6 14) to 1000 ml wIth dIstilledwater 10ml=001mgN02-N USing standard nItrate solutlOn (613) prepare the followmg standards m 100 ml volumetnc flasks 7 1 72 7.3 7.4 7.5 7 6 77 TurbIdIty removal One of the followmg methods may be used to remove suspended matter 7 1 1 FIlter sample through a glass fiber filter or a 0 45u membrane filter 71.2 Add 1 ml ZinC sulfate solutlOn (6 7) to 100 ml of sample and mIX thoroughly Add 04-05 ml sodIUm hydroXide solutlOn (6 8) to obtain a pH of 10 5 as determined WIth a pH meter Let the treated sample stand a few minutes to allow the heavy flocculent preCIpItate to settle Clanfy by filtenng through a glass fiber filter or a o45u membrane filter Oil and grease removal Adjust the pH of 100 ml of filtered sample to 2 by addItion of cone HCI Extract the oil and grease from the aqueous solution WIth two 25 ml portlOns of a non-polar solvent (Freon, chloroform or eqUIvalent) IfthepHofthesampleISbelow5orabove9,adjusttobetween5and9WItheIthercone HCI or conc NRtOH ThIS IS done to Insure a sample pH of 8 5 after step 7 4 To 25 0 ml ofsample or an ahquot diluted to 25 0 ml, add 75 ml ofammOnIum chlonde- EDTA solutlOn (6 4) and mIX PoursampleIntocolumnandcollectsampleatarateof7-10mlpermmute DIscard the first 25 ml, collect the rest of the sample (approxImately 70 ml) m the ongmal sample flask Reduced samples should not be allowed to stand longer than 15 mmutes before addItIon ofcolor reagent, step 7 7 Add 20 ml of color reagent (66) to 500 ml of sample Allow 10 mmutes for color development Withm 2 hours measure the absorbance at 540 nm agamst a reagent blank NOTE: Ifthe concentratlOn ofsample exceeds 10 mg N03-N/1, the remamder ofthe reduced sample may be used to make an appropnate dilutlOn before proceedmg WIth step 77 Cone, mg-N03-NII 000 005 010 020 050 100 ml of Standard SolutlOn/100 0 ml 00 05 10 20 50 100 3533-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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