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Anal)sls Procedure Notes 1 1 2 3 4 For the analysIs procedure and the calculatIOn, see "Direct Aspiration", part 9 1 of the Atomic Absorption Methods section of this manual The 3302 nm resonance lme ofsodlUm, which has a relative senSItIvity of 185, prOVides a convenient way to aVOid the need to dilute more concentrated solutIOns ofsodlUm Low-temperature flames mcrease sensitivIty by reducmg the extent of I011lZatIOn of thIS easIly 1011lzed metal I011lZatIOn may also be controlled by addmg potasslUm (1000 mg/l) to both standards and samples Data to be entered mto STORET must be reported as mg/l The flame photometnc method may also be used (Standard Methods, 14th EdItIOn, p 250) Precision and Accuracy 1 In a smgle laboratory (EMSL), usmg dIstIlled water samples spIked at levels of 8 2 and 52 mgNa/l, the standard deViatIOns were ±O 1 and ±O 8, respectIvely Recovenes at these le\els were 102% and 100% 273 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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