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48. The diesel fuels burned in auxiliary and main diesel engines of tugboats operating in harbor areas are required to meet certain specifications. Among these are limits of certain contaminants to limit atmospheric emissions to acceptable levels. Which of the following soluble contaminants is applicable?
Sulfur content in diesel fuel is limited due to the emission of sulfur oxides (SOx), which are harmful atmospheric pollutants. Asphaltenes and total sediment relate to fuel stability, while water is a mechanical concern; sulfur is the soluble contaminant directly regulated to control air emissions.
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