Abstract
Nanoparticles formed in motor vehicle exhaust have received increasing attention due to their potential adverse health effects. But there are a lot of uncertain points for chemical properties and formation mechanisms of diesel nanoparticles. The objective of this study was to characterize nanoparticles emitted from a light-duty diesel engine operated on a dynamometer. Diesel nanoparticles which typically range in diameter from 3 to 30 nm were observed only under idling, high load and deceleration conditions. The formation characteristics of diesel nanoparticles under idling and high load conditions depended mainly on fuel distillation characteristics and sulfur content in fuel, respectively while fuel-cut control of fuel injection in deceleration process had a strong influence on those under deceleration condition. Nanoparticles under idling and deceleration conditions were composed mainly of high boiling point hydrocarbons (heavy hydrocarbons) in fuel and/ or lubricating oil and those under high load conditions consisted of sulfuric acid. The formation characteristics of diesel volatile nanoparticles was controlled by number concentration of accumulation mode particles.
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