(JP11118763-A)      NOVELTY - The component(s) is converted into a measurable gas using a catalyst-oxidiser (I) then the measurable gas analysed by atmospheric pressure ionisation mass spectrometry (APIMS) to a sensitivity of below 1ppb. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for (a) a catalyst-oxidiser system for use in converting the component comprising a catalyst cell, heater block, rod heater and thermocouple and (b) an analytical system for the concentration measurement comprising (I).    USE -   Trace analysis is ultra high purity (UHP) gases. Six key impurities such as hydrogen, carbon oxide, methane, oxygen, water and carbon dioxide are measurable in a UHP gas such as argon or nitrogen to below 1ppb levels.    ADVANTAGE -   Measurement is carried out in a single instrument. Impact due to adsorption and desorption of impurities in the system is a minimum and the impurity level is quickly detected. DESCRIPTION OF DRAWING(S) - Graph represents CO response at mass 44 (CO2) as measured during invention system.    (CN1218180-A)      NOVELTY - The component(s) is converted into a measurable gas using a catalyst-oxidiser (I) then the measurable gas analysed by atmospheric pressure ionisation mass spectrometry (APIMS) to a sensitivity of below 1ppb. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for (a) a catalyst-oxidiser system for use in converting the component comprising a catalyst cell, heater block, rod heater and thermocouple and (b) an analytical system for the concentration measurement comprising (I).    USE -   Trace analysis is ultra high purity (UHP) gases. Six key impurities such as hydrogen, carbon oxide, methane, oxygen, water and carbon dioxide are measurable in a UHP gas such as argon or nitrogen to below 1ppb levels.    ADVANTAGE -   Measurement is carried out in a single instrument. Impact due to adsorption and desorption of impurities in the system is a minimum and the impurity level is quickly detected. DESCRIPTION OF DRAWING(S) - Graph represents CO response at mass 44 (CO2) as measured during invention system.