Mobilization and loss of elements from roofing tiles

Fazrul Razman Sulaiman, Peter Brimblecombe, Carlota M. Grossi

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9 Citations (Scopus)


Deposition, leaching and chemical transformation are processes that affect roofing tile and roof runoff water. Leaching experiments, with artificial rainwater in the laboratory, showed the presence of Na+, K+, Mg2+, Ca2+, Cl-, NO3-, SO42-, with a ratio of Ca2+ and SO42- suggesting gypsum dissolution. X-ray fluorescence (XRF) of the exposed roof tile showed depletion such as Mg, Al, Si, P, Ti and K at the surface of the tile and an enrichment of Fe and Mn which hinted at a process akin to laterite formation. However, calcium appeared to be enriched at the surface as gypsum (confirmed by X-ray diffraction) and to a lesser extent calcite, which is characteristic of deposits on building surfaces in cities.
Original languageEnglish
Pages (from-to)795-801
Number of pages7
JournalEnvironmental Geology
Issue number4
Publication statusPublished - 2009

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