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SULFATE Method 375.4 (Turbidimetric) STORET NO. Total 00945 1 Scope and ApphcatlOn 1 1 ThIS method IS apphcable to dnnkmg and surface waters, domestIc and Industnal wastes 1 2 The method IS sUItable for all concentratIon ranges ofsulfate, however, In order to obtaIn rehable readIngs, use a sample alIquot contaInIng not more than 40 mg S04/1 13 ThemInImUmdetectablehmltISapproxImately1mg/1sulfate 2 Summary ofMethod 2 1 22 Sulfate Ion IS converted to a banum sulfate suspensIon under controlled condltlOns The resultmg turbIdIty IS determIned by a nephelometer, filter photometer or spectrophotometer and compared to a curve prepared from standard sulfate solutIons Suspended matter and color mterfere Correct by runnIng blanks from WhICh the barIUm chlonde has been omItted 23 3 Comments SIlIca I n concentratIons over 500 mg/1 WIll Interfere 3 1 Propnetary reagents, such as Hach Sulfaver or eqUIvalent, are acceptable 3 2 Preserve by refngeratlOn at 4°C 4 Apparatus 41 MagnetIc stIrrer, vanable speed so that It can be held constant Just below splashIng Use IdentIcal shape and SIze magnetIc stlrrmg bars 42 Photometer one ofthe followmg WhICh are gIven In order of preference 4 2 1 Nephelometer 4 2 2 Spectrophotometer for use at 420 nm wIth hght path of4 to 5 cm 4 2 3 FIlter photometer wIth a vlOlet filter haVIng a maXImum near 420 nm and a hght pathof4to 5cm. 43 Stopwatch, Ifthe magnetIc stIrrer IS not eqUIpped WIth an accurate tImer 44 MeasurIng spoon, capacIty 0 2 to 0 3 ml 5 Reagents 5 1 CondltlOnmg reagent Place 30 ml conc HCI, 300 ml dIstIlled water, 100 m195% ethanol orIsopropanoland75gNaCImsolutlOnInacontamer Add50mlglycerolandmIX 5 2 Banum chlonde, BaCI2, crystals, 20 to 30 mesh 5 3 SodIUm carbonate SolutIon (approxImately 0 05N) Dry 3 to 5 g pnmary standard Na2C03 at 250°C for 4 hours and cool m a deSIccator WeIgh 2 5 ±O 2 g (to the nearest mg), transfer to a 1 hter volumetnc flask and fill to the mark wIth dIstIlled water Approved for NPDES Issued 1971 Edltonal reVISIon 1978 3754-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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