Apparatus and Methods for an Atmospheric Sampling Inlet for a Portable Mass Spectrometer

摘要

Atmospheric sampling system designed to minimize cross-contamination between successive samples acquired by a portable, or handheld, mass spectrometer. Techniques to reduce the overall sample load on portable mass spectrometers having limited pumping capacity, such as capture pumps. Techniques and methods employing simple manual devices and micro vacuum pumps for purging the inlet system of a mass spectrometer. Reduction of cross-contamination between successive samples, permitting a portable mass spectrometer to correctly associate sample positives with specific sample sites or individuals.

主权项

1. A pulsed atmospheric sampling system for a portable mass spectrometer comprising:
an inlet port for sample injection; a controllable flap or barrier affixed to said inlet port; a capillary line for transfer of said sample injection into said portable mass spectrometer; a pulse valve for controlling the time period of said sample injection through said capillary line; a tee connector located in said capillary line between said inlet port and said pulse valve, where the tee connector is connected to a vacuum source used for purging said sampling system between sample acquisitions.