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The concentration of Pb in theinjected solutionwas 1.86 ng mL−1. The concentrations of Pb in lipstickswere quite high; a relatively high q value (0.9) was applied via thedynamic reaction cell facility. This was done to effectively reduce thesensitivity of the ICP-MS. Peak areas of the flow injection signals wereused for quantification. Because another isotope of the same elementrepresents the ideal internal standard for that element, isotope dilutionresults are expected to be highly accurate even when the sample containshigh concentrations of concomitant elements and/or losses occurduring sample preparation or during sample introduction into the ICP.In this work, the concentrations of Pb were determined by isotope dilutionmethod.
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