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In the inspiratory limb of a ventilator circuit far away from the patient 'wye' to ensure that warm exhaled gas does not fool the controller system. Never place a probe in an isolette or a radiant warmer, where the probe is warmed externally and the humidifier is fooled into shutting down, reducing the humidity available to the patient.
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Potassium can be determined by flame emission spectrometry (flame photometry) using a lithium internal standard. The following data were obtained for standard solutions of and an unknown containing a constant known amount of as the internal standard. All the intensities were corrected for background by subtracting the intensity of a blank.
(a) Plot the K emission intensity vs. the concentration of and determine the linearity from the regression statistics.
(b) Plot the ratio of the intensity to the Li intensity vs. the concentration of and compare the resulting linearity to that in part (a). Why does the internal standard improve linearity?
(c) Calculate the concentration of in the unknown.
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