When you have a sample of unknown composition ICP-MS has the capability of quickly determining the sample’s composition and an estimated concentration of more than 70 elements at one time on almost all elements heavier than Sodium (Z ≥ 11), with an accuracy of +/- 30% or better on completely unidentified samples.

The ICP-MS is able to do this because elements are known to respond in a particular way to other elements under specific set conditions that the ICP-MS uses, to learn more about the particular method, please read more about the semiquantitative method on the instrument manufacturer’s reference about an older ICP-MS model, linked below.
Description of Semiquantitative Analysis from Agilent Technologies

We offer this service here at the Elemental Analysis Core, please Contact Us for pricing.