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Notes 1 HIgh levels ofsIlIcon may mterfere 2 The aIr-acetylene flame absorbs about 25% ofthe energy at the 213 9 nm lIne 3 The sensItIvIty may be mcreased by the use oflow-temperature flames 4 Some sample contamer cap lIners can be a source of zmc contammatlOn To CIrcumvent or aVOId thIS problem, the use ofpolypropylene caps IS recommended 5 Th,e dIthizone colorImetrIc method may also be used (Standard Methods, 14th EdItion, p 265) 6 For concentratIons of zmc below 001 mg/1, eIther the SpeCIal ExtractIon Procedure gIven m part 9 2 of the AtomIc AbsorptIon Methods sec~lOn or the furnace procedure, Method 289 2, IS recommended 7 Data to entered mto Storet must be reported as ug/1 Precision and Accuracy , 1. Number of Labs An mterlaboratory study on trace metal analyses by atomIC absorptIon was conducted by I\' the QualIty Assurance and Laboratory Evaluation Branch of EMSL SIX synthetIc concentrates contammg varymg levels of alumm~m,cadmIUm, chromIUm, copper, Iron, manganese, lead and zmc were added to natural water samples The statIstIcal results for zmc were as follows Standard True Values Mean Value DeVIatIon Accuracy as ug/hter ug/hter ug/hter % BIas 281 284 97 12 86 89 310 308 114 -D7 82 81 62 61 56 62 28 113 70 75' 28 66 7 22 26 206 11 17 18 566 2891-2 IIII I IPDF Image | Methods for Chemical Analysis of Water and Wastes
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