This application note describes the use of the 490 Micro GC for the analyses of mine gas, especially carbon monoxide at low level, detection of which is essential for the safety of mine workers. Three independent GC channels analyze the sample in less than two minutes, including permanent gases and C1-C2 hydrocarbons.
This document details a method for analyzing mine gases using the Agilent 490 Micro Gas Chromatograph (Micro GC). The primary focus is on the detection of trace carbon monoxide (CO) at low concentrations within bulk methane, which is critical for mine worker safety. The analysis utilizes three independent channels to separate and detect permanent gases, C1-C2 hydrocarbons, and other components in less than two minutes.
The procedure specifies distinct chromatographic conditions for each channel. Channel 1 uses argon as a carrier gas on a Molsieve column to measure hydrogen, helium, and other permanent gases. Channel 2 employs helium with an extra-high sensitivity mode to detect very low levels of carbon monoxide without interference from methane. Channel 3 analyzes carbon dioxide, ethane, and ethylene using a CP-PoraPLOT Q column.
The instrument is used to detect carbon monoxide at low levels, which is essential for mine worker safety.
Three independent channels analyze the sample in less than two minutes.
The limit is approximately 50 to 100 ppm for these gases.