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The Modulated Variable Internal Standard Method

Volume 28, Number 4 (Aug. 1974) Page 356-357

Nasser, M.I.


In this paper, a new approach to the internal standard method has been done in which it was found satisfactory to construct only one working curve for any element at a constant concentration of the internal standard. A correction factor is applied to the result to compensate for the additional amounts of the internal standard element added to the samples to raise its concentration up to a constant value. This method is relatively rapid, economic, and reproducible. Standard deviations of ±1.5, ±3.2, and ±8.8% were reported for duplicate determinations of cobalt, manganese, and chromium, respectively, in oil ashes.