Rehydroxylation (RHX) dating: Mass loss issues due to incomplete drying, carbon content, and mineral alteration

Research output: Contribution to journalArticle

4 Citations (Scopus)
145 Downloads (Pure)

Abstract

As part of rehydroxylation (RHX) dating trials on post-medieval bricks, investigations were carried out into the presence, and effect on age estimations, of uncertainties associated with (a) prolonged and incomplete drying of samples, (b) the removal of organic and non-organic matter during heating, and (c) mineral alteration during heating. All samples exhibit an issue with a prolonged period of drying, exceeding two months at 130 °C. Methods for treating this issue are applied and demonstrate the need for higher resolution and more precise monitoring of the mass loss during drying if the moisture not removed needs to be taken account of; this may not be necessary if prolonged drying is associated with the slow removal of chemisorbed water, distinct from rehydroxylation-related water loss. Organic matter contamination is also present in significant quantities in all samples, regardless of the retrieval context; the considerable effects of uncertainties in this quantity, arising from variability in the organic matter to organic carbon ratio (OM/OC), on age estimations are presented. Mineral alteration during reheating is generally negligible except when gypsum is present; large sources of uncertainty arising from moisture loss associated with dehydration and with subsequently lower levels of physisorption following reheating are highlighted as problematic.
Original languageEnglish
JournalJournal of Archaeological Science Reports
Early online date09 Feb 2017
DOIs
Publication statusEarly online date - 09 Feb 2017

Fingerprint

uncertainty
heat pump
water
environmental pollution
monitoring
Incomplete
Carbon
Minerals
Alteration
Drying
Uncertainty
Water
Age Estimation
Organic Matter
Moisture
Post-medieval
Brick
Gypsum
Monitoring
Contamination

Cite this

@article{55ad11f2b2304a7aa335361ff13bb77d,
title = "Rehydroxylation (RHX) dating: Mass loss issues due to incomplete drying, carbon content, and mineral alteration",
abstract = "As part of rehydroxylation (RHX) dating trials on post-medieval bricks, investigations were carried out into the presence, and effect on age estimations, of uncertainties associated with (a) prolonged and incomplete drying of samples, (b) the removal of organic and non-organic matter during heating, and (c) mineral alteration during heating. All samples exhibit an issue with a prolonged period of drying, exceeding two months at 130 °C. Methods for treating this issue are applied and demonstrate the need for higher resolution and more precise monitoring of the mass loss during drying if the moisture not removed needs to be taken account of; this may not be necessary if prolonged drying is associated with the slow removal of chemisorbed water, distinct from rehydroxylation-related water loss. Organic matter contamination is also present in significant quantities in all samples, regardless of the retrieval context; the considerable effects of uncertainties in this quantity, arising from variability in the organic matter to organic carbon ratio (OM/OC), on age estimations are presented. Mineral alteration during reheating is generally negligible except when gypsum is present; large sources of uncertainty arising from moisture loss associated with dehydration and with subsequently lower levels of physisorption following reheating are highlighted as problematic.",
author = "Gerard Barrett",
year = "2017",
month = "2",
day = "9",
doi = "10.1016/j.jasrep.2017.02.001",
language = "English",
journal = "Journal of Archaeological Science Reports",
issn = "2352-409X",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Rehydroxylation (RHX) dating: Mass loss issues due to incomplete drying, carbon content, and mineral alteration

AU - Barrett, Gerard

PY - 2017/2/9

Y1 - 2017/2/9

N2 - As part of rehydroxylation (RHX) dating trials on post-medieval bricks, investigations were carried out into the presence, and effect on age estimations, of uncertainties associated with (a) prolonged and incomplete drying of samples, (b) the removal of organic and non-organic matter during heating, and (c) mineral alteration during heating. All samples exhibit an issue with a prolonged period of drying, exceeding two months at 130 °C. Methods for treating this issue are applied and demonstrate the need for higher resolution and more precise monitoring of the mass loss during drying if the moisture not removed needs to be taken account of; this may not be necessary if prolonged drying is associated with the slow removal of chemisorbed water, distinct from rehydroxylation-related water loss. Organic matter contamination is also present in significant quantities in all samples, regardless of the retrieval context; the considerable effects of uncertainties in this quantity, arising from variability in the organic matter to organic carbon ratio (OM/OC), on age estimations are presented. Mineral alteration during reheating is generally negligible except when gypsum is present; large sources of uncertainty arising from moisture loss associated with dehydration and with subsequently lower levels of physisorption following reheating are highlighted as problematic.

AB - As part of rehydroxylation (RHX) dating trials on post-medieval bricks, investigations were carried out into the presence, and effect on age estimations, of uncertainties associated with (a) prolonged and incomplete drying of samples, (b) the removal of organic and non-organic matter during heating, and (c) mineral alteration during heating. All samples exhibit an issue with a prolonged period of drying, exceeding two months at 130 °C. Methods for treating this issue are applied and demonstrate the need for higher resolution and more precise monitoring of the mass loss during drying if the moisture not removed needs to be taken account of; this may not be necessary if prolonged drying is associated with the slow removal of chemisorbed water, distinct from rehydroxylation-related water loss. Organic matter contamination is also present in significant quantities in all samples, regardless of the retrieval context; the considerable effects of uncertainties in this quantity, arising from variability in the organic matter to organic carbon ratio (OM/OC), on age estimations are presented. Mineral alteration during reheating is generally negligible except when gypsum is present; large sources of uncertainty arising from moisture loss associated with dehydration and with subsequently lower levels of physisorption following reheating are highlighted as problematic.

U2 - 10.1016/j.jasrep.2017.02.001

DO - 10.1016/j.jasrep.2017.02.001

M3 - Article

JO - Journal of Archaeological Science Reports

JF - Journal of Archaeological Science Reports

SN - 2352-409X

ER -