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Notes 1 Number of Labs 74 74 64 64 61 60 An Interlaboratory study on trace metal analyses by atomic absorptIOn was conducted by the Quality Assurance and Laboratory EvaluatIOn Branch of EMSL SIX synthetic concentrates contaInIng varyIng levels ofalumInum, cadmIUm, chromIUm, copper, Iron, manganese, lead and ZInC were added to natural water samples The statistical results for lead were as follows 1. 2 The analysIs of this metal IS exceptIOnally sensitive to turbulence and absorption bands In the flame Therefore, some care should be taken to POSltl~~the lIght beam In the most stable, center portIOn of the flame To do this, first adjust the burner to maximize the absorbance readIng with a lead standard Then, aspirate a water blank and make mInute adjustments In the burner alIgnment to mlmmlze the signal For levels oflead below 200 ug/l, either the Special ExtractIOn Procedure given In part 9 2 of the Atomic AbsorptIOn Methods sectIOn or the furnace techmque, Method 239 2, IS recommended The follOWIng lInes may also be used 2170 urn RelatIve Sensitivity 04 261 4 nm Relative SensItivity 10 For quality control reqUIrements and optIOnal recommendatIOns for use In dnnkIng water analyses, see part 10 ofthe Atomic AbsorptIOn Methods section oftlus manual Data to be entered Into STORET must be reported as ug/l 3. 4 5 Precision and Accuracy True Values ug/ltter 367 334 101 Standard Mean Value DevlatlOn ug/ltter ug/ltter Accuracy as % BIas 2 9 377 128 340 111 101 46 1 8 - 0 2 84 85 40 11 37 41 25 96 25 31 22 257 239 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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