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Notes I For levels of manganese below 25 ug/l, eIther the furnace procedure, Method 243 2, or the Special ExtractIOn Procedure given m part 9 2 of the AtomIC AbsorptIOn Methods sectIonISrecommended TheextractIonIScarnedoutatapHof45to5 Themanganese chelate IS very unstable and the analysIs must be made wIthout delay to prevent ItS re- solutIon m the aqueous phase 2 The followmg lme may also be used 403.1 nm RelatIve SenSItIVIty 10 3 Data to be entered mto STORET must be reported as ug/l 4 The persulfate colonmetnc method may also be used (Standard Methods, 14th EdItIon, p225) Precision and Accuracy 1 Number of Labs An mterlaboratory study on trace metal analyses by atomIC absorptIOn was conducted by the Quahty Assurance and Laboratory EvaluatIOn Branch of EMSL SIX synthetIc concentrates contammg varymg levels ofalummum, cadmIUm, chromIUm, copper, Iron, manganese, lead and zmc were added to natural water samples The statIstICal results for manganese were as follows Standard True Values Mean Value DeViation Accuracy as ug/1lter ug/hter ug/hter % Bias 77 426 432 70 15 78 469 474 97 12 71 84 86 26 21 70 106 104 31 - 2 1 55 11 21 27 93 55 17 21 20 22 243 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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