Pratt seam (Alabama)
Alabama, Appalachian Region, United States
Othercharbon (Hg)
- Type
- Coal deposit (medium volatile bituminous coal, Pennsylvanian)
Medium volatile bituminous coal seam of Pennsylvanian age, calorific content of 14,413 Btu; sample PSOC 137 of the DOE Coal Sample Bank (Pennsylvania State University), homogenised and packed under argon; mercury with a mean δ202Hg of -0.99 ‰ and Δ201Hg of -0.14 ‰ (Biswas et al., 2008). Coordinates not given.
δ202Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.99 ± 0.04 ‰ | −1.03 / −0.95 ‰ | 3 | coal (medium volatile bituminous coal) Mean and standard deviation recalculated from 3 subsamples, the standard deviation reflects deposit heterogeneity; subsamples combusted separately: -0.95 ± 0.07 ‰ (2SD 2 analyses); -0.98 ± 0.01 ‰ (2SD 3 analyses); -1.03 ± 0.08 ‰ (2SD 3 analyses); 8 analyses in total. | Biswas et al. (2008), Natural mercury isotope variation in coal deposits and organic soil… |
Δ201Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.14 ± 0.02 ‰ | −0.16 / −0.12 ‰ | 3 | coal (medium volatile bituminous coal) Mean and standard deviation recalculated from 3 subsamples, the standard deviation reflects deposit heterogeneity; subsamples combusted separately: -0.12 ± 0.01 ‰ (2SD 2 analyses); -0.14 ± 0.03 ‰ (2SD 3 analyses); -0.16 ± 0.03 ‰ (2SD 3 analyses); 8 analyses in total. | Biswas et al. (2008), Natural mercury isotope variation in coal deposits and organic soil… |
Δ199Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.14 ± 0.02 ‰ | 1 | coal (medium volatile bituminous coal) Single subsample; uncertainty = 2SD of 2 replicate analyses; Δ199Hg measured on 1 of the 3 subsamples (protocol without mass 199 for the others). | Biswas et al. (2008), Natural mercury isotope variation in coal deposits and organic soil… |
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Cite this page
IsoFind Atlas (2026). Pratt seam (Alabama), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/couche-pratt-alabama/ (accessed 2026-10-15).
@misc{isofind2026prattseamalabamaisotopesignat,
title = {Pratt seam (Alabama), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/couche-pratt-alabama/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15