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6 the reqUIred number oftubes wIthout slgmficant drop m temperature when the tubes are Immersed 5 5 Water bath sUItable for use at 10-15°C Reagents 61 DIstIlled water free of mtrIte and mtrate IS to be used m preparatIOn of all reagents and standards 62 SodIUm chloride solutIOn (30%) DIssolve 300 g NaCI m dIStilled water and dIlute to 1 lIter 63 SulfUriCaCIdSolutIon Carefullyadd500mlconc H2S04to125mldIstIlledwater Cool and keep tIghtly stoppered to prevent absorptIOn of atmospheric mOIsture 64 Brucme-sulfamlIc aCId reagent DIssolve 1 g brucme sulfate [(C23H26N204)2eH2S04e7H20] and 0 1 g sulfamhc aCId (NH2C6H4S03HeH20) m 70 ml hot dIstIlled water Add 3 ml conc HCI, cool, mIX and dIlute to 100 ml WIth dIstIlled water Store m a dark bottle at 5°C ThIS solutIOn IS stable for several months, the pmk color that develops slowly does not effect ItS usefulness Mark bottle WIth warmng CAUTION Brucme Sulfate IS tOXIC, take care to aVOId mgestIOn 65 PotaSSIUm mtrate stock solutIOn 10 ml = 0 1mg NOrN DIssolve 07218 g anhydrous potaSSIUm mtrate (KN03) m dIstIlled water and dIlute to 1 hter m a volumetriC flask PreserveWIth2mlchloroformperhter ThISSolutIonISstableforatleast6months 66 PotaSSIUm mtrate standard solutIOn 10 ml = 0001 mg N03-N DIlute 10 0 ml of the stock SolutIon (65) to 1 hter m a volumetriC flask ThIS standard solutIOn should be prepared fresh weekly 67 Acetic aCId (1 + 3) DIlute 1 volume glaCIal acetIC aCId (CH3COOH) WIth 3 volumes of dIstIlled water 68 SodIUm hydrOXIde (IN) DIssolve 40 g of NaOH m dIstIlled water Cool and dIlute to 1 hter Procedure 7.1 Adjust the pH of the samples to approxImately 7 WIth acetIC aCId (6 7) or sodlUm hydrOXIde (6 8) Ifnecessary, filter to remove turbIdIty 72 Set up the reqUIred number of sample tubes m the rack to handle reagent blank, standards and samples Space tubes evenly throughout the rack to aI10w for even flow of bath water between the tubes ThIS should aSSIst m achIevmg umform heatmg of all tubes 73 IfIt IS necessary to correct for color or dIssolved orgamc matter whIch wIll cause color on heatmg, a set of duphcate samples must be run to WhICh all reagents except the brucme- sulfamhc aCId have been added 74 PIpette 100 ml of standards and samples or an ahquot of the samples dIluted to 10 0 ml mto the sample tubes 75 If the samples are sahne, add 2 ml of the 30% sodlUm chlOride solutIOn (62) to the reagentblank,standardsandsamples Forfreshwatersamples,sodlUmchlOridesolutIOn may be omItted MIX contents of tubes by sWIrlmg and place rack m cold water bath (O-lO°C) 7 352 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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