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Instrumental Parameters (General) 1. Silver hollow cathode lamp 2. Wavelength 328 1nm 3 Fuel Acetylene 4 OXIdant AIr 5 Typeofflame OXldIzmg I1 Analysis Procedure 1 For the analysIs procedure and the calculation, see "Direct AspiratIOn", part 9 1 of the Atomic Absorption Methods sectIOn ofthis manual Notes 1 For levels ofSilver below 30 ug/l, either the SpeCial ExtractIOn Procedure, given m part 92 ofthe Atomic Absorption Methods sectIOn o~ the furnace procedure, Method 272 2, IS recommended 2 SIlver mtrate standards are hght sensitive Dilutions of the stock should be discarded afteruseasconcentrationsbelow 10mg/l arenotstableoverlongpenodsoftime 3 If absorptIOn to contamer walls or the formation of AgClls suspected, make the sample basIc usmg conc NH40H and add 1ml of(CNI) solutIOn per 100 ml ofsample MIx the sample and allow to stand for 1 hour before proceedmg wIth the analysIs (I) Method301A ,, 4 The 338 2 nm wavelength may also be used ThiS has a relatIve sensitivity of2 5 DatatobeenteredmtoSTORETmustbereportedas ug/l' , 1 Precision and Accuracy 1 In a round-robm study reported by Standard Methods, a synthetic sample contammg 50 ug A g/l was analyzed by 50 laboratones With a reported standard deViatIon of ±8 8 and a relative error 10 6% ' References 1. "The Use of Cyanogen IodIde (CNI) as a Stablhzmg Agent for StIver m Photographic Processmg Effluent Sample", Owerbach, Damel, Photographic Technology DIVISion, Eastman Kodak Company, Rochester, N Y 14650 , 2 Standard Methods for Exammatlon of Water and Wastewater, 14th Edition, p 148, 272 1-2 ,;PDF Image | Methods for Chemical Analysis of Water and Wastes
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