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Instrument Parameters 1 DryIng tune and temperature 30 sec @ 125°C 2 CharnngtImeandtemperature 30sec@ 1200°C 3. AtomIzIng tIme and temperature 10 sec @ 2700°C 4 Purge Gas Atmosphere Argon 5 Wavelength 1960nm 6 Other operatIng parameters should be set as speCIfied by the partICular Instrument manufacturer AnalysIs Procedure 1 For the analysIs procedure and the calculatIon see "Furnace Procedure" part 9 3 of the AtomIC AbsorptIOn Methods sectIOn oftms manual Notes 1. The above concentratIon values and Instrument condItIOns are for a PerkIn-Elmer HGA- 2100, based on the use of a 20 ul lUJecnon, purge gas lUterrupt and non-pyrolync graphIte Smaller sIze furnace deVIces or those employIng faster rates of atomIzatIOn can be operated USIng lower atoffilzatlOn temperatures for shorter tIme penods than the above recommended settIngs 2. The use ofbackground correctIon IS recommended 3 Selemum analysIs suffers Interference from chlondes (> 800 mg/l) and sulfate (> 200 mg/l) FortheanalysIsofIndustnaleffiuentsandsampleswIthconcentratIonsofsulfate from 200 to 2000 mg/l, both samples and standards should be prepared to contaIn 1% mckel 4 For every sample matnx analyzed, venficatlOn IS necessary to deterrmne that method of standard addItIOn IS not reqUIred (see part 5 2 1 of the AtomIC AbsorptIOn Methods sectIon ofthIS manual) 5 For qualIty control reqUIrements and optIOnal recommendatIons for use In dnnkIng water analyses, see part 10 of the AtomIC AbsorptIOn Methods sectIOn of thIs manual 6 If method of standard addItIOn IS reqUIred, follow the procedure given earlIer In part 8 5 ofthe AtomIC AbsorptIOn Methods sectIOn ofthIS manual 7 Data to entered Into STORET must be reported as ug/l Precision and Accuracy 1 USIng a sewage treatment plant effiuent contaInIng <2 ug/l and spIked wIth a concentratIon of20 ug/l, a recovery of99% was obtaIned 2 USIng a senes of Industnal waste effiuents spIked at a 50 ug/l level, recovenes ranged from 94 to 112% 3 USIng a 0 1% mckel mtrate solutIOn as a synthetIc matnx with selemum concentratIOns of 5, 10,20,40, 50, and 100 ug/l, relative standard deVIatIOns of 14 2, 11 6, 9 3, 72, 64 and 4 1%, respectively, were obtaIned at the 95% confidence level 2702-2 " "PDF Image | Methods for Chemical Analysis of Water and Wastes
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