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Notes 1 The follow1Og wavelengths may also be used 359 3 nm Relative SensltlVlty 1 4 425 4 nm Relative SenSItiVity 2 427 5 nm Relative Sensitivity 3 428 9 nm Relative SensItivity 4 2 The fuel nch air-acetylene flame provides greater senSitiVity but IS subject to chemical and matnx 10terference from Iron, mckel, and other metals If the analySiS IS performed 10 a lean flame the 10terference can be lessened but the sensitivity Will also be reduced 3 The suppression of both Cr (III) and Cr (VI) absorptIOn by most 1Oterfer1Og Ions 10 fuel nch aIr-acetylene flames is reportedly controlled by the additIOn of 1% ammomum bifluonde 10 0 2% sodium sulfate [Talanta 20, 631 (1973)] A 1% ox1Oe solutIOn IS also reported to be useful 4 For levels of chromIUm between 50 and 200 ug/1 where the air-acetylene flame can not be used or for levels below 50 ug/1, either the furnace procedure or the extractIOn procedure IS recommended See Method 218 2 for the furnace procedure and Method 218 3 for the chelatlOn-extractlOn procedure 5 For qUality control reqmrements and optIOnal recommendatIOns for use 10 dnnk10g water analyses, see part 10 ofthe AtomiC AbsorptIOn Methods sectIOn ofthis manual 6 Datatobeentered1OtoSTORETmustbereportedasug/1 Precision and Accuracy 1 Number of Labs A n 1Oterlaboratory study on trace metal analyses by atomiC absorptIOn was conducted by the Quality Assurance and Laboratory EvaluatIOn Branch of EMSL SiX synthetiC concentrates conta101Og vary10g levels ofalum1Oum, cadmIUm, chromIUm, copper, Iron, manganese, lead and z10c were added to natural water samples The statistical results for chromIUm were as follows True Values ug/hter Standard Mean Value DeViatiOn ug/hter ug/hter Accuracy as % Bias - 4 5 - 6 5 74 76 72 74 72 29 -31 70 93 84 35 -102 47 74 102 78 377 47 150 160 90 68 370 407 353 105 380 128 218 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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