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Notes 1 The above concentratIon values and Instrument condItIOns are for a Perkin-Elmer HGA- 2100, based on the use ofa 20 ul inJectIon, continUous flow purge gas and non-pyrolytic graphIte Smaller SIze furnace devIces or those employing faster rates of atomIzatIOn can be operated USing lower atomIzatIOn temperatures for shorter tIme perIods than the above recommended settings i ' 2 TheuseofbackgroundcorrectIOnISrecommended 3 Greater sensItIVIty can be achIeved USing the 2170 nm line, but the optImum concentratIOn range IS reduced The use of a lead e1ectrodeless dIscharge lamp at thIS lower wavelength has been found to be advantageous Also a lower atomIzatIOn temperature (2400°C) may be preferred 4 To suppress sulfate Interference (up to 1500 ppm) lanthanum IS added as the nitrate to both samples and calIbratIOn standards (AtomIc AbsorptIon Newsletter Vol 15, No 3, p 71, May-June 1976 ) 5 Since glassware contaminatIOn IS a severe problem In lead analYSIS, all glassware should be cleaned ImmedIately prIor to use, and once cleaned, should not be open to the atmosphere except when necessary 6 For every sample matrIX analyzed, verIficatIOn IS necessary to determine that method of standard addItIOn IS not reqUIred (see part 5 2 1 of the AtomIC AbsorptIOn Methods section OfthiS manual) 7 For qualIty control reqUIrements and optIOnal recommendatIons for use In drinking water analyses, see part 10 ofthe AtOmIC AbsorptIOn Methods sectIOn ofthIS manual 8 If method of standard addItIon IS reqUIred, follow the procedure gIven earlIer In part 8 5 ofthe AtomIC AbsorptIon Methods sectIon ofthIS manual 9 Data to be entered Into STORET must be reported as ug/1 Precision and Accuracy 1 In a Single laboratory (EMSL), USing CinCinnatI, OhIO tap water spIked at concentratIons of 25, 50, and 100 ug Pb/1, the standard deVIatIOns were ±1 3, ±1 6, and ±3 7, respectIvely RecoverIes at these levels were 88%, 92%, and 95% respectIvely 2392-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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