Technical Note: What is total potential sulfate?

Definition and Background

Total Potential Sulfate (TPS) represents the chemical equivalent of the maximum sulfate that could be theoretically generated if all sulfur within a sample of a geological material (e.g., soil, rock, aggregate etc.) was to oxidise.

TPS is determined as part of the assessment of sulfur-species, in combination with determination of water-soluble sulfate, acid-soluble sulfate and total sulfur. This conversion has been used since at least the late 1970s (e.g., Nixon 1978, Wilson 1987) and is now found in most UK guidance, having been formalised in BR 279 (Bowley 1995) and used in the M5 motorway thaumasite investigations (TEG 1999).… Read the rest