G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 1/10 (2006.01) G01N 1/00 (2006.01) G01N 1/28 (2006.01) G01N 21/01 (2006.01) G01N 30/72 (2006.01) H01J 49/04 (2006.01) H01J 49/10 (2006.01) G01N 1/04 (2006.01)
Patent
CA 2062629
A liquid sample to be analyzed is fed to an ink jet printer micro pump. The pump directs the solution, as a stream of uniformly sized and spaced droplets, into a laminarly flowing stream of hot carrier gas. The carrier gas evaporates the solvents (e.g. water) in the droplets to form a stream of dried particles. The particles are vaporized by a plasma, laser or other heat source. The vapour can be ionized and the ions analyzed by a mass spectrometer, or the vapour can be analyzed by optical spectroscopy. The method reduces oxide and other interference effects, increases sample utilization, and reduces waste, signal noise, and memory effects, increasing instrument productivity. Multiple nozzles can be used to change samples or to shoot calibrating droplets, further increasing productivity. Signal detection can be synchronized with droplet firing, or the signal, which is intrinsically modulated at the drop frequency, can be low pass filtered and synchronously detected, to increase the signal to noise ratio. The dried particles can also be directed into a vacuum chamber and deposited in a desired pattern on a surface in the vacuum, thus delivering controlled micro-dosages of material onto the surface.
Etkin Bernard
French John Barry
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Perkinelmer Health Sciences Inc.
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