Identification and Analysis of Coal Tars in Road Binder

From January 31st 2019, all utilities arisings must be classified as hazardous unless proved to be non hazardous.
New rules in 2018 make it expensive to incorrectly classify waste as non
hazardous if it is hazardous. Substantial fines and potential prosecution are a
consequence.
 
The main reason for utility arisings being hazardous is the presence of coal tar in the road binder. However, not all road binder will contain coal tar or contain coal tar at a hazardous concentration.
Disposal of hazardous material is very expensive and often involves transporting material long distances to a suitable disposal facility.
 
Bituminous mixtures containing >0.1% coal tar are hazardous (Code 17 03 01), but non hazardous (Code 17 03 02) if the coal tar content <=0.1% or the Benzo a Pyrene concentration of the coal tar portion <0.005%
PAK test spray is frequently used to test for coal tar but is unreliable and cannot be used in wet or cold conditions.

Simple Road Tar Test

Chemical analysis is the only way to identify if coal tar is present in road binder, but this is not time consuming, difficult or expensive when using the QED HC-1 analyser. We have refined the process to "shake, dip and read," which takes about 20 seconds, involves no data entry (unless records are needed) and can be done by anyone, anywhere. The QED automatically generates a results page (below.)

Easy to Understand Results

The QED produces these results immediately, and provides all the information needed to correctly classify the road binder type. In the results sheet on the left, look at the final column. Any entry that mentions coal tar at above 0.1% is hazardous. So samples 2,4,5,7 and 8 are hazardous. The others are not. It's a simple, reliable and effective method.
Sample RP1 (row 1 in results sheet above) is from a bitumen based road binder and contains both raw bitumen and a typical bitumen based road binder.

Under WM3 this is Non Hazardous.
The QED has matched the fingerprint from sample H22 (row 4 in results sheet) to bitumen and
coal tar. The results show that 17% of the binder is coal tar with a BaP content of approximately 1.2%.

This material is Hazardous under WM3 guidance.

For Regulatory Purposes

The QED generates a fingerprint of the sample hydrocarbon and automatically
compares it to a comprehensive library of reference material fingerprints.
Sample 8 is from a 1950s vintage road binder, predominantly made
from coal tar. The similarity between
the red library fingerprint for coal tar and the black sample fingerprint is
obvious.
Sample 10 shows the fingerprint of a modern, undegraded bitumen
based road binder.
This is Non Hazardous.

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QROS Limited, SSI House,Fordbrook Business Park, Pewsey, Wiltshire SN9 5NU
  Telephone  0800 046 9695   info@qros.co.uk
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