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"Factors Affecting The Overall Performance Of Analytical Instrumentation In Trace Level Determination Of S And N In Hydrocarbon Matrices By Combustion-UV Fluorescence And Chemiluminescence"

Sulfur compounds in fossil fuels are considered responsible for color degradation as well as gum formation in detriment of quality of motor fuels. Not less important is the contribution of many of these compounds to enhance corrosion of tanks, vessels, reactors and pipe lines causing high maintenance efforts and costly downtimes. Trace nitrogen in naphtha and other refinery streams is an important parameter for the optimization of refining catalytic processes since nitrogen containing compounds can irreversibly poison costly catalysts and affect the quality of final products. Combustion of hydrocarbons followed by UV-Fluorescence and Ozone Chemiluminescence has become a preferred method to determine trace level amounts of sulfur and nitrogen in gases, liquids and solid samples. This analytical technique is very selective, sensitive and exhibits a linear wide dynamic range.

In general this procedure is fast, easy, reliable and complies with ten ASTM and three Euorpean Standard Test methods. Results show an excellent stability and sensitivity of the analytical system. Comparison with ASTM Inter Laboratory Proficiency Programs shows an excellent agreement. All experiments were performed in a MultiTek® vertical analyzer equipped with two detectors for the automatic injection and simultaneous detection of trace S and N.

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