Patent ID: 9583320
Date: 2017-02-28
CPC Classifications: H01J,Y10T

Claim:
1. A method for the quantitative determination of a chemical substance S contained in or derived from a sample using a mass spectrometer having at least one detector, comprising steps of: providing an ion beam for detection that is free from passage through a split ion detector; operating the mass spectrometer in a non-scanning, alternate peak detection mode; setting the mass spectrometer to detect using a common detector at least masses SM wherein substantially a full beam of ions hits an ion detector when the system is set to CM and only part of the full beam of ions reaches the detector when set to SM evaluating from the measured intensity values for masses CM, SM in reliance of the result of the interference evaluating step, determining the quantity of the mass CM by a selected one of: (i) setting the mass spectrometer for the mass CM and detecting the mass or (ii) by means of calculation from the measured intensity values for the masses SM