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Analysis Procedure 1 For the analysIs procedure and the calculatIOn, see "DIrect AspiratIOn", part 9 1 of the AtomIc AbsorptIon Methods sectIon of thIs manual Notes 1 In aIr-acetylene or other hIgh temperature flames (> 2800°C), potassIum can experIence partial IOnIZatIOn whIch mdirectly affects absorptIOn senSItIVIty The presence of other alkalI salts m the sample can reduce this IOnIZatIon and thereby enhance analytIcal results The IOnIZatIOn suppressIve effect of sodIUm is small If the ratIO of Na to K IS under 10 Any enhancement due to sodIUm can be stabIlIzed by addmg excess sodIUm (1000 ug/ml) to both sample and standard solutIOns If more strIngent control of IOnIzatIon is reqUIred, the addItion of ceSIUm should be conSIdered Reagent blanks should be analyzed to correct for potaSSIUm ImpUrIties m the buffer stock 2 The4044nmlInemayalsobeused ThISlInehasarelatIvesensItlVltyof500 3 To cover the range of potaSSIUm values normally observed m surface waters (01-20 mg/l), It IS suggested that the burner head be rotated A 90° rotatIon of the burner head prOVIdes approxImately one-eIghth the normal senSItiVIty 4. The flame photometrIc or colOrImetrIC methods may also be used (Standard Methods, 14th EdItIOn, p 234 & 235) 5 Data to be entered mto STORET must be reported as mgll Precision and Accuracy 1 In a smgle laboratory (EMSL), usmg dIstIlled water samples spiked at concentrations of 1 6 and (5 3 mg Kll The standard deViatIOns were ±O 2 and ±O 5, respectively Recovenes at these levels were 103% and 102%, respectively 258 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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