6.(2 answers) Estimate the minimum sample mass needed for a representative sample from the 4-8mm fraction and from the 8-16mm fraction, assuming every 3 out of 100 particles arepollutants. Also explain how your method?

7.Explain how you took the samples experimentally?
8.(2 answers) What is the total mass of your samples 4-8mm and 8-16mm?
9.(2 answers) If there is a big difference between Q8 and Q6, explain why?
0.18
1.45
Total sample mass [kg] (Q8)
2.62
2.64
Table 2:
Minimum calculated and total weighted sample mass
From the values of table 2 we can observe that for both samples we have a real sample that is bigger
compared to the minimum required sample that was calculated in Q6. Especially for S48 this
difference is relatively big enough. Those differences we could consider that are expected as the
minimum sample mass calculated in Q6 is a theoretical value which was based on the assumption that
there are 20 pollutant particles and their concentration is 3%. That means, that if the number of
pollutants is smaller than 20 then the sample is not adequate. However, in practice bigger samples with
more pollutants and higher concentations are collected in order to reduce the error and the uncertainty.
Finally, we should also take into consideration that in practice pollutants consist not only of bricks but
of other material types with diverse densities as well.
1.3 Separation of samples into sink and float fractions

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- Spring '18
- Dr. maarten bakker
- ........., Palstics, Concrete, Separation