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Specific surface area (SSA)

LK Laura V. Krone
FH Ferdinand J. Hampl
CS Christopher Schwerdhelm
CB Casey Bryce
LG Lars Ganzert
AK Axel Kitte
KÜ Kirstin Übernickel
AD Armin Dielforder
SA Santiago Aldaz
RO Rómulo Oses-Pedraza
JP Jeffrey Paulo H. Perez
PS Pablo Sanchez-Alfaro
DW Dirk Wagner
UW Ute Weckmann
FB Friedhelm von Blanckenburg
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The specific surface area (SSA) was determined by nitrogen gas sorption using the BET equation58. About 3 g of powdered sample material was degassed in a Vac Prep Q61 Sample Degas System (Micromeritics, USA). During the degassing process, bedrock samples were heated up to 250 °C, samples from zones C-E up to 60 °C for durations of 8–20 h, and samples from zone A and B up to 120 °C for 16 h. After degassing, the SSA was measured by N2 sorption in a Gemini VII Surface Area and Porosity analyser (Micromeritics, USA). The uncertainty of the SSA measurement is ~ 1.1% based on repeat analysis (n = 3, relative SD = 0.29%) of a certified reference material (Carbon Black, SSABET = 21.52 ± 0.75 m2 g−1). The detection limit is 0.01 m2 g−1.

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