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<div class="moz-cite-prefix">Crispin, Tom,<br>
<a class="moz-txt-link-freetext" href="http://www.ithaka-journal.net/certificate/european-biochar-certificate-v4.2-final2012.pdf">http://www.ithaka-journal.net/certificate/european-biochar-certificate-v4.2-final2012.pdf</a><br>
This document includes a lengthier discussion of PAHs in char,
including how some chars are used to bind them in soils, and that
current methods for testing are problematic.<br>
<br>
We have test results from chars that could be called ' wood
gasification' char at levels below the 4mg/kg limit for 'premium
biochar'.<br>
<br>
The high PAH levels >1000mg/kg in wood gasification chars
mentioned below needs a further explanation of the production
method. Wood gasification is to vague.<br>
<br>
Are there any PAH tests results for TLUD rice hull chars?<br>
<br>
Alex<br>
<br>
<br>
<br>
On 06/02/2013 2:35 PM, Crispin Pemberton-Pigott wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear
Tom<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks
for that:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><a moz-do-not-send="true"
href="http://www.bacatec.de/dl/Ge09_Glaser-Steiner_engl.pdf">http://www.bacatec.de/dl/Ge09_Glaser-Steiner_engl.pdf</a><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">“</span><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">A
further criterion for the quality of biochar is the lack of
contamination with both inorganic<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">(e.g.
heavy metals) and organic contaminants (e.g. polycyclic
aromatic hydrocarbons (PAH),<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">dioxins
etc.). In this study, we could only evaluate polycyclic
aromatic hydrocarbons (PAH,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">Fig.
4). Although chars from wood gasification are within the
elemental composition and the<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">black
carbon thresholds, they exhibit extremely high PAH contents
(Fig. 4). Therefore, they<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif";background:aqua;mso-highlight:aqua">are
not suited for soil amendment</span><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">
and thus, they cannot be classified as biochar. Surprisingly<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">high
PAH contents were also measured in the barbeque charcoals
(Fig. 4) while all other<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif"">investigated
chars had low PAH contents (Fig. 4).”<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:11.0pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Well,
there’s a kick in the head. Why not? Because of chemicals
manufactured in the process that were not there in the
original fuel. That may explain a lot to some experimenters.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Crispin<o:p></o:p></span></p>
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