Needle trap for use with a gas chromatograph-mass spectrometer for field sampling and analysis

摘要

A system and method for improving operation of a needle trap by changing a flow path through a needle trap to enable a needle to draw a fluid sample into a working end of the needle and out through the side hole, wherein drawing the sample through the side hole eliminates the possibility of a leak through the side hole while drawing a fluid sample into the working end.

主权项

1. A needle trap system for sampling and delivering a fluid or material in a fluid to an analytical device, said system comprised of:
a needle having a working end for receiving a sample fluid; at least one packing bed disposed in the needle and adjacent to the working end for trapping analyte; a side hole disposed through a side of the needle to gain access to an interior space of the needle; a first loose-fitting wire disposed in the needle and adjacent to the packing beds at one end to keep the packing beds from moving toward the side hole, and continuing past the side hole; and a plug disposed adjacent to the first loose-fitting wire in order to stop fluid flow through the needle past the side hole, and for reducing dead volume within the needle.