Composition of Total Diesel Particulate Matter and The Relation To Smoke Opacity
The composition of TPM (total diesel particulate matter) is the sum of "dry" particulates,and "wet" particulates.
"Dry" Particulate emissions are also known as inorganic soot, black carbon, or elemental carbon.
"Wet" particulates are also known as organic carbon, soluble organic fractions ( SOF's)and volatile organic carbon ( VOC's).
The exact ratio of "wet to dry" diesel particulate matter will vary by engine load, duty cycle, fuel composition and specification,and engine tuning.
An opacity reading is a measurement of the level of visible inorganic carbon, also known as soot. Opacity measurements cannot detect organic carbon emissions, VOC / SOF emissions, or NOx emissions.
Specialized instrumentation is required to determine organic carbon levels,and to detect other unseen particulates. When used in conjunction with an opacity meter, the technician can detect ( for example) an increase in TPM, and detect a decrease in visible smoke ( opacity ) emissions.
Read more about this topic: Environmental Technology Verification Program
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