Now there is a sensible scientific approach, not just an idea!
Not that they (double ratio plots) are at exceptionally accurate but there are so many other sources of deposition for PAHs and their attachment to fugitive dusts from exhausts, fire depositions, weathered macadam dust, spilt oils and so on. They are ubiquitous and it would give an approximation and the grouping of data would become immediately apparent.
I now have several hundred macadam PAH analyses and there is good agreement with the vast majority of data. It also becomes apparent what level of PAH is noise. With the levels of most environmental soil PAH analysis being quite noisy due to the distribution being in reality quite close to the limit of detection of tests (and let us not forget the lab error bars that must be applied to that) I feel sure that there would be substantially more noise than in my macadam samples.
I don't like the "let's just look at BaP level" approach to PAH provenance assessment because it is a very narrow view and tells us not very much.
Cheers
Russell
-----Original Message-----
From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Mark Henderson
Sent: 23 April 2015 11:42
To: [log in to unmask]
Subject: Re: Wood ash / Allotment BaP
It would be interesting to see the whole BaP set with fluoranthene, pyrene, BaA and chrysene. You could then plug them into a double ratio plot and see if they point to a single source.
Just an idea
Regards
Mark C Henderson BSc(Hons) MSc DIC MIEnvSc Technical Director
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-----Original Message-----
From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Taylor, Christopher
Sent: 23 April 2015 07:57
To: [log in to unmask]
Subject: Re: Wood ash / Allotment BaP
Hi Chris
Sure. Here are the BaP results from 7 random allotments.
3.44 17.70 26.30 5.97 7.20 2.93 9.45 15.12 12.25 14.73
1.58 2.17 0.64 2.56 3.20 7.14 2.85 0.85 0.85 6.37
0.83 <0.05 <0.05 0.98 8.72 0.59 3.47 0.32 3.16 0.70
3.48 1.87 5.40 2.54 3.71 2.34 0.67 8.56 1.73 1.96 2.02 11.67 2.52 10.86
2.69 1.95 8.11 12.43 7.73 0.58 8.99 8.69 14.17 5.65 3.56 5.86 3.32 3.62 7.46 6.13 7.63 6.54 9.59 3.52 3.20 3.78 0.83 7.42 4.74 3.55 9.95 4.19
3.60 3.13 5.33 5.13 3.96
1.02 0.99 1.38 2.32 1.02 2.44 2.44 3.16
Regards
Christopher Taylor
Enforcement Officer
Regulatory Services
Brent Council
Tel: 020 8937 5159
www.brent.gov.uk
-----Original Message-----
From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Chris Dainton
Sent: 22 April 2015 23:33
To: [log in to unmask]
Subject: Re: Wood ash / Allotment BaP
Neil & Chris
Can you share the BaP results (just the numbers will do) from the allotment testing you've undertaken so the List can get a feel of the range of BaP numbers encountered, rather than just min - max etc.
Cheers
Chris Dainton
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