METHOD AND SYSTEM FOR REDUCING INTERFERENCES IN THE SPECTROMETRIC ANALYSIS OF STEROIDS

摘要

A system and method for reducing interferences in the spectrometric analysis of a sample from a blood collection tube comprising an ion source for ionizing a sample extracted from the blood collection tube, the sample containing one or more steroids. The system comprises a differential mobility spectrometer for receiving the ions from the ion source, a boundary member defining a curtain gas chamber containing the differential mobility spectrometer; and a curtain gas supply for providing a curtain gas into an inlet of the differential mobility spectrometer for providing a gas flow through the differential mobility spectrometer and a curtain gas outflow out of a curtain gas chamber inlet. A system and method is disclosed for providing a modifier supply for supplying an actual volumetric flow rate of an organic acid modifier to a drift gas supply for reducing interferences.