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(See Note 8) Cool and add 15 ml of carbon dIsulfide m small portIOns and wIth sWIrhng Dtlute to 1 hter wIth chloroform The solutIOn can be used for several months If stored m a brown bottle m a refngerator NOTE 8: An acceptable grade of pyrrohdme may be obtamed from the Aldnch ChemIcal Co, 940 West St Paul Ave, Mtlwaukee, WI 53233 (414, 273-3850) 7 7 2 AmmOnIum hydroxIde, 2N DIlute 13 ml conc NH40H to 100 ml with deIOnIzed dIstIlled water 773 Bromophenolbluemdicator(l glItter) DIssolve0 1gbromophenolbluem 100 ml of 50 percent ethanol or Isopropanol 774 HCI,25%vlv DIlute2mlredIstIlledHCI(6N)to40mlWIthdeIOnIzeddIstIlled water 8 PreparatIon of Standards and CahbratIOn 8 1 8 2 Stock standard solutIOns are prepared from hIgh punty metals, OXIdes or nonhygroscopiC reagent grade salts usmg deIOmzed dIstIlled water and redIstIlled mtnc or hydrochlonc acIds (See mdividual analySIS sheets for speCIfic mstructIOn) Sulfunc or phosphonc aCIds should be aVOIded as they produce an adverse effect on many elements The stock SolutIons are prepared at concentratIOns of 1000 mg of the metal per hter CommercIally avaIlable standard solutIOns may also be used CahbratIOn standards are prepared by dilutmg the stock metal SolutIons at the tIme of analySIS For best results, cahbratIOn standards should be prepared fresh each tIme an analySIS IS to be made and dIscarded after use Prepare a blank and at least four cahbration standards m graduated amounts m the appropnate range The cahbratIOn standards should be prepared usmg the same type of aCId or combmatIOn of aCIds and at the same concentratIon as WIll result m the samples followmg processmg As filtered water samples are preserved WIth 1 1 redIstIlled HN03 (3 ml per hter), cahbratIOn standards for these analyses should be sImtlarly prepared WIth HN03 Begmmng WIth the blank and workmg toward the hIghest standard, aspIrate the solutIons and record the readmgs Repeat the operatIOn WIth both the cahbration standards and the samples a suffiCIent number of tImes to secure a rehable average readmg for each solutIOn CahbratIOn standards for furnace procedures should be prepared as descnbed on the mdividual sheets for that metal Where the sample matnx IS so complex that VISCOSIty, surface tenSIon and components cannot be accurately matched WIth standards, the method of standard addItIOn must be used ThIS techmque rehes on the addItIon of small, known amounts of the analySIS element to portIons of the sample-the absorbance dIfference between those and the origmal solutIOn gIvmg the slope of the cahbratIOn curve The method of standard addItIon IS descnbed m greater detaIl m (8 5) 8 3 MET ALS-IIPDF Image | Methods for Chemical Analysis of Water and Wastes
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