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52 53 5.4 Mercury Hollow Cathode Lamp Westmghouse WL-22847, argon filled, or eqUivalent Recorder' Any multi-range vanable speed recorder that' IS compatible wlth the UV detectlOn system IS sUitable Absorptlon Cell Standard spectrophotometer cells 10 cm long, havmg quartz end wmdows may be used SUitable cells may be constructed from plexlglass tubmg, I" 0 D X 4-1/2" The ends are ground perpendlcular to the longltudmal aXlS and quartz wmdows (I" dlameter X 1/16" thickness) are cemented m place Gas mlet and outlet ports (also of pieXlglass but 1/4" 0 D ) are attached approxlmately 1/2" from each end The cell IS strapped to a burner for support and ahgned m the hght beam to glve the maXlmum transmlttance NOTE 2: Two 2" X 2" cards wlth one mch dlameter holes may be placed over each end ofthe cell to asS1St m posltionmg the cell for maXlmum transmlttance Air Pump Any penstaltic pump capable of dehvermg 1 hter of alr per mmute may be used AMasterflexpumpwlthelectromcspeedcontrolhasbeenfoundtobesatlsfactory (Regulated compressed alr can be used m an open one-pass system) Flowmeter Capable ofmeasunng an alr flow of 1 hter per mmute Aeration Tubmg Tygon tubmg IS used for passage ofthe mercury vapor from the sample bottle to the absorptlOn cell and return Stralght glass tubmg termmatmg m a coarse porous fnt IS used for spargmg alr mto the sample Drymg Tube 6" X 3/4" dlameter tube contammg 20 g ofmagneslUm perchlorate (See Note3) TheapparatusISassembledasshownmtheaccompanymgdlagram NOTE 3: In place of the magneslUm perchlorate drymg tube, a small readmg lamp wlth 60W bulb may be used to prevent condensatlOn of mOlsture mSlde the cell The lamp IS posltioned to shme on the absorptlOn cell mamta~mng the air temperature m the cell about 10°C above amblent 5.5 56 5.7 58 6 Reagents 61 Aqua Regla Prepare Immedlately before use by carefully addmg three volumes of conc HCItoonevolumeofconc HN03 62 Sulfunc ACld, 0 5 N Dllute 14 0 ml ofconc sulfunc aCld to 1hter 63 Stannous Sulfate Add 25 g stannous sulfate to 250 ml of 0 5 N sulfurlC aCld (6 2) ThlS mlxture IS a suspenslOn and should be stlrred contmuously durmg use 6.4 SodlUm Chlonde-Hydroxylamme Sulfate SolutlOn Dlssolve 12 g of sodlUm chlonde and 12 g ofhydroxylamme sulfate m dlstllied water and dl1ute to 100 ml NOTE 4: A 10% solutlOn of stannous chlonde may be Substltuted for (63) and hydroxylamme hydrochlonde may be used m place of hydroxylamme sulfate m (64) 65 Potassmm Permanganate 5% solutlOn, w/v Dlssolve 5 g of potasSlUm permanganate m 100 ml ofdlstllled water 66 Stock Mercury SolutlOn Dlssolve 0 1354 g of mercunc chlonde m 75 ml of dlstllied water Add 10 ml of conc mtnc aCld and adjust the volume to 100 0 m ilO ml = 10 mgHg 67 Workmg Mercury SolutlOn Make succeSSlve dllutlOns of the stock mercury solutlOn (6 6) to obtam a workmg standard contammg 0 1 ug/ml Thls workmg standard and the dllutlOn of the stock mercury solutlOns should be prepared fresh dally ACldlty of the 2455-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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