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, NOTE: If solubilizatlOn or dIgestion IS not reqUIred, adjust the HN03 concentratIon of the sample to 1% (v/v) and add 2 ml of 30%H20 2 and 2 m1 of 5% nIckel nItrate to each 100 ml of sample The volume of the calIbratlOn standard should be adjusted WIth delOnIzed dIstIlled water to match the volume change ofthe sample Instrument Parameters (General) 1. DrymgTImeandTemp 30sec-125°C 2 AshmgTImeandTemp 30sec-ll00°C 3 AtomIzmgTImeandTemp IOsec-2700°C 4 PurgeGasAtmosphere Argon 5. Wavelength 1937nm 6 Other operatmg parameters should be set as specIfied by the partIcular mstrument manufacturer Analysis Procedure 1 For the analysIs procedure and the calculatIon, see "Furnace Procedure" part 9 3 of the AtomIC Absorption Methods sectIon of thIS manual Notes 1 The above concentration values and mstrument condItIons are for a PerkIn-Elmer HGA- 2100, based on the use of a 20 ul InJection, purge gas Interrupt and non-pyrolytIc graphtte Smaller SIze furnace deVIces or those etnploymg faster rates of atomIzatIon can be operated usmg lower atomizatIon temperatures for shorter tIme penods than the above recommended settmgs 2 The use ofbackground correction IS recommended 3 For every sample matnx analyzed, venfication IS necessary to determme that method of standard addItlOn IS not reqUIred (see part 5 2 1 of the AtomIC Absorption Methods section ofthts manual) 4 If method of standard addItion IS requIred, follow the procedure given earlIer m part 8 5 ofthe AtomIC AbsorptIon Methods sectIon ofthIS manual 5. For qualIty control requIrements and optlOnal recommendatIons for use m drinking water analyses, see part 10 ofthe AtomIC AbsorptlOn Methods sectIon ofthIS manual 6. Data to be entered mto STORET must be reported as ug/l Precision and Accuracy 1 In a smgle laboratory (EMSL), usmg a mIxed mdustnal-domestic waste effiuent contaming 15 ug/l and spiked WIth concentratlOns of 2, 10 and 25 ug/l, recovenes of 85%, 90% and 88% were obtamed respectIvely The relatIve standard deviatlOn at these concentratIons levels were ±8 8%, ±~ 2%, ±5 4% and ±8 7%, respectIvely 2 In a smgle laboratory (EMSL), usmg CmcmnatI, OhIO tap water spIked at concentratlOns of 20, 50 and 100 ug As/I, the standard deviatlOns were ±O 7, ±11 and ±1 6 respectIvely Recovenes at these levels were 105%, 106% and 101%, respectIvely 2062-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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