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Notes 1 The above concentratiOn values and mstrument cond1tiOns are for a Perkm-Elmer HGA- 2100, based on the use of a 20 ul mJecton, contmuous flow purge gas and non-pyrolyt1c graph1te 2 Hydrogen perox1de 1S added to the aC1d1fied solutiOn to convert all chrommm to the tnvalent state Calcmm 1S added to a level above 200 mg/l where 1tS suppreSS1ve effect becomes constant up to 1000 mg/l 3 Background correctiOn may be reqmred 1fthe sample contams h1gh d1sso1ved sohds 4 N1trogen should not be used as a purge gas because ofposs1ble CN band mterference 5 P1pet t1pS have been reported to be a poss1ble source of contammatlon (See part 5 2 9 of the Atom1c AbsorptiOn Methods sectiOn oft1us manual) 6 Foreverysamplematnxanalyzed,venficatiOn1Snecessarytodetermmethatmethodof standard add1tion 1S not reqmred (see part 52 1 of the Atom1c AbsorptiOn Methods sectiOn oftms manual) 7 If method of standard add1tiOn 1S reqmred, follow the procedure glVen earher m part 8 5 ofthe Atom1c AbsorptiOn Methods sectiOn ofth1s manual 8. For quahty control reqmrements and optiOnal recommendatiOns for use m dnnkmg water analyses, see part 10 ofthe Atoffilc AbsorptiOn Methods sectiOn ofth1s manual 9 Data to be entered mto STORET must be reported as ug/l Precision and Accuracy 1 In a smgle laboratory (EMSL), usmg Cmcmnat1, OhiO tap water sp1ked at concentratiOns of 19, 48, and 77 ug Cr/l, the standard dev1atiOns were ±O I, ±O 2, and ±O 8, respect1vely Recovenes at these levels were 97%, 101%, and 102%, respectively 2182-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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