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Chemical and Physical Properties of Ultrafine Diesel Exhaust Particles Sampled Downstream of a Catalytic Trap

2006; American Chemical Society; Volume: 40; Issue: 17 Linguagem: Inglês

10.1021/es052267+

1520-5851

Melissa A. Grose, Hiromu Sakurai, Jake Savstrom, Mark R. Stolzenburg, Winthrop F. Watts, Christopher G. Morgan, Ian P. Murray, M. V. Twigg, David B. Kittelson, Peter H. McMurry,

Atmospheric chemistry and aerosols

The chemical and physical properties of exhaust particles produced by a Caterpillar 3176 C-12 heavy duty diesel engine equipped with a catalytic trap (CRT) are reported. The engine was operated at 600 Nm and 1500 rpm, using fuels containing 15 and 49 ppm sulfur. A two-stage dilution tunnel designed to simulate the reactions that occur when hot combustion products mix with cooler atmospheric air was used. Particle size distributions were measured using a scanning mobility particle sizer (SMPS) and nano-scanning mobility particle sizer (nano SMPS); a nanomicro-orifice uniform deposit impactor (nano MOUDI) collected size-resolved samples for gravimetric and chemical analysis. A nanometer tandem differential mobility analyzer (nano TDMA) was used to measure the volatility and hygroscopicity of 4-15 nm particles. These measurements confirm that the particles consisted primarily of sulfates.