Methoden voor de berekening van de emissies door mobiele ... - CBS

Figure 1.6 Calculation of emissions from road traffic, emissions of PAH components and
heavy metals (cadmium, copper, chrome, nickel, selenium, zinc, arsenic, vanadium) caused by
wear of tyres, brake linings and road surfaces
per
EMISSIONS total wear debris
1000 kg
- vehicle category
- fuel type
- road type
EMISSIONS heavy metals
and PAH components
per - vehicle category
- fuel type
- road type
1000 kg
PROFILES
heavy metals
and PAH components
Leakage of engine oil; heavy metals and PAHs
The average oil leakage per vehicle per kilometre travelled has been calculated in the past, derived
from the total oil leakage in that year and the total number of vehicle kilometres. This calculation is
based on measurements on roads that were interpreted by Feenstra and Van der Most [ref 7: Feenstra
and Van der Most, 1985] and resulted in an average leakage loss of 10 mg per vehicle kilometre. The
leakage losses for the various vehicle categories in road traffic are calculated based on a set of
factors, of which an example is given in Table 1.20. These factors are based on a number of
assumptions that are listed in Table 1.21. One of the assumptions is that older vehicles have more
leakage than younger vehicles (see also Figure 1.7).
Heavy metals in leaked engine oil
The emission of heavy metals due to the leakage of engine oil depends on the composition of the
motor oil. The heavy metal fractions in engine oil are shown in Table 1.33B.
PAHs in leaked engine oil
The calculation of the emission of PAH components due to oil leakage takes place in the same way as
the calculation of heavy metals. Table 1.33B be shows the composition used in the calculations
(fractions of PAH components in engine oil).
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