Research Paper: Derived chemical terms for sulfur-species assessment

derived chemical terms

Tom St John (University of Bristol) has published a paper on the use and limitations of derived chemical terms for assessing sulfur-species in ground materials. The author considers a wide range of derived chemical terms used in the literature, such as equivalent pyrite and total potential sulfate and the limitations involved in their application.

The paper is titled “Use of derived terms for sulfur-species in geological materials”.


“An assessment of the sulfur/sulfide content of ground materials for civil engineering purposes is essential in order to understand the potential for sulfate development. In the absence of detailed petrographic/mineralogical data, terms such as “total potential sulfate”, “oxidisable sulfides” and “equivalent pyrite” are often derived from sample test results for total sulfur, water-soluble sulfate and acid-soluble sulfate.
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Research Paper: Sulfur-species in glacial tills

sulfur-species in glacial tills

Brian Hawkins (HM Geotechnics) and Tom St John (University of Bristol) have published a paper on the presence of sulfur-species in glacial tills (boulder clays) and the implications for engineering and construction. The authors consider a case study of road construction (A10) in an area underlain by glacial till in Hertfordshire, UK.

The paper, titled “Engineering significance of sulfur/sulfate in glacial tills” follows prior discussion of the A10 case study by Hawkins (2013):

Hawkins, A.B. (2013). Some engineering geological effects of drought: examples from the UK. Bulletin of Engineering Geology and the Environment.… Read the rest