April 2021

Welcome to our April 2021 newsletter. We are excited to discuss the following topics with you:

  • Paper on a review of worst case metal species in waste classification
  • Pamphlet describing “TPH” testing and our new HWOL Acronym system
  • Waste Classification training course dates
  • News outlets via our social media platforms: Linkedin & Twitter

New publication:  Hazardous waste classification: Review of worst case to less worst case metal species with a worked example for a contaminated soil

Ian Bishop (One Touch Data Ltd), Pierre Hennebert (INERIS), Detritus / Volume 14 – 2021 / pages 4-24.

The classification of waste as either hazardous or non-hazardous, especially for mixtures such as contaminated soils, ashes, filter cakes and sludges, is not straight forward. In particular, as the laboratories can only measure total metal concentrations, both the European and the UK technical guidance state that if the classifier doesn’t know exactly which metal species is in their waste, then they should start from a worst case species and use lines of evidence to work towards a more reasonable(less hazardous) species. However, the guidance doesn’t define or list worst case nor less worst case species. While some authors have documented worst case species, this is only in relation to documenting the concentrations at which each hazard property is triggered for a given worst case species. This paper addresses this gap. It documents how to define both the worst case species and more importantly, lists less worst case species for 32 elements and 204 metal species; species based on those listed in the European legislation but also supplemented by species that haven’t (yet) been included in this legislation but are significant nevertheless. For each species, the paper tabulates the hazard property that triggers first, metal concentrations, conversion factors and other metadata, species by species, in descending order of hazard. Finally, to demonstrate how to use the data, either manually or by utilizing commercial software, the paper will give a worked example for a contaminated soil, showing how classifiers can use the list to help move from a worst case to a less worst case species.

The paper also describes the waste classification process and compliments the topics covered in our training courses.
The paper can be downloaded here. 

Guide to understanding “TPH” tests using the HWOL Acronym

In our November 2020 newsletter, we announced the roll out of the  ew HWOL Acronym System which will make laboratory data (in-particular “TPH” tests) easier to understand and more transparent for results present in both the solids report and the “mineral oil” in the WAC report.

It will also allow easier comparison of “TPH” results from different laboratories such as the mineral oil examples shown above.

We are pleased to announce that all our certified HWOL laboratories have or are working towards including these acronyms in their PDF reports, with Element, ALS, DETS North and Nicholls Colton first off the mark. To aid understanding of both the acronyms and “TPH”, we have produced a 10 page explanation document that covers both the HWOL acronyms and the basics of analysis of hydrocarbons by both 1D and (the emerging) 2D gas chromatography technology.

The pamphlet can be downloaded here. We hope you find this informative and useful.

Online waste classification training courses

 Our online training courses continue to be a success and are being run on a bi-monthly basis. The courses are held over ‘Zoom’ where delegates are given access to HazWasteOnline™ and our online learning platform which contains online training material. The full training booklets are posted to delegates  prior to the course start date.
 Our upcoming training course dates are:

  • Hazardous waste classification & Advanced waste classification 
    • 21st – 22nd April 2021
    • 9th – 10th June 2021
  • Refresher Course
    • 20th April 2021
    • 8th June 2021

The refresher course is aimed at delegates who have previously completed the 2 day training course over 3 years ago.If you wish to book a place onto a course, please follow the link to our online booking form:

Social Media content

We have created HazWasteOnline accounts for Twitter and LinkedIn so we have other routes to communicate with stakeholders. We will add short articles, links to publicationsand other noteworthy information (such as latest lab to be certified to produce the .hwol data file) on a more regular basis without waiting to release a whole newsletter to let you know!

Please give us a follow! The links to the pages are below.