O. I. Corporation, Inc.

Bernie B Bernard

Kenneth K Jiang

A water management system removes water vapor from the analyte slug that is desorbed from the trap. The water management system includes a device having a passage through which the volatile organic chemicals and water pass, the passage being designed to remove water vapor by swirling action on the stream. The amount of water removed is more than can be accounted for by simple condensation. The invention also includes the adjustment of the temperature of the water management device during the sample concentration cycle to prevent undesired condensation prior to desorption.

Water management device for gas chromatography sample concentration

A method and apparatus for adjusting the raw, instantaneous response of an NDIR and determining a linear response therefrom is disclosed. The NDIR detector cell is connected to an output which is adjusted according to the function (Ax)/(1-x) where the coefficient A is a constant for the NDIR being used, and x is the raw, instantaneous, response of the detector. The coefficient A is determined by assessing the maximum response of the NDIR with an infinite mass of analyte within the sample cell.

Method and apparatus for linearization of non-dispersive infrared

Management device for gas chromatography sample concentration

A filter for preventing foam and debris from accumulation on the trap used in sample concentration apparatus is disclosed. The filter is preferably a sintered metal frit removably inserted in the concentrator inlet on a sparge vessel. The filter also serves as a check valve for preventing water vapor or residual analytes in the sparge vessel from contaminating dry gas or other external samples which pass through the concentrator inlet.

Sample concentrator filter

An improved digestion chamber (10) is provided for use in a carbon analysis system. A catalyst (16), selected from the platinum metals group consisting of platinum, rhodium, palladium, osmium, iridium and ruthenium, provides an oxidizing surface for the sample being analyzed. The oxidant (26) is preferably persulfate, which may be stored in a generally stable solution until needed for sample oxidation. The catalyst (16) may be provided as a digestion chamber wire insert, such as a rod or as a plating on the chamber walls, enabling an increased variety of materials to be used for the vessel. In a preferred embodiment of the digestion chamber, polytetrafluoroethylene is used to reduce the background carbon which must be corrected in the analysis.

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College Station, TX, United States of America

Bernie B Bernard