An assessment of procedures to remove exogenous Sr before 87Sr/86Sr analysis of wet archaeological wool textiles

I.C.C. von Holstein, L. Font Morales, E.E. Peacock, M.J. Collins, G.R. Davies

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Strontium isotope analysis (87Sr/86Sr) has been employed as a provenancing tool for archaeological wool textiles. To date, the effect of post-depositional (soil burial environment) contamination on keratin samples, which contain ∼ppm concentrations of Sr, has not been rigorously investigated. We compared published methods for removing exogenous Sr from keratinous textiles, using either: (1) compressed N2 gas, (2) HF(aq) solution (with and without a strong oxidising agent to remove dyestuff) or (3) organic solvents. 87Sr/86Sr ratios and Sr contents were determined in undyed and madder-dyed/alum-mordanted moieties of the same wool textile, buried for up to three years in contrasting environments (marine sediment/fenland bog), and two archaeological textiles recovered in Iceland (one typical and one atypical of local manufacture). Undyed experimental samples had low Sr contents (0.07–0.29 ppm) that were increased by both dyeing (0.14–8.92 ppm) and soil burial (0.11–15.01 ppm). The efficacy of Sr removal was: HF(aq) + oxidising agent > organic solvents > HF(aq) > compressed N2. Unburied samples showed little variation in 87Sr/86Sr ratio between cleaning methods (0.00006–0.00035); buried samples showed greater variation (0.00257–0.00713). Archaeological samples showed Sr contents greater than experimental soil burials (1–118 ppm), and 87Sr/86Sr values consistent with Icelandic groundwater (0.70357–0.70540). No cleaning methods retrieved original (unburied and undyed) 87Sr/86Sr ratios except treatment with compressed N2 in undyed samples. Exogenous Sr from the short term soil burial environment is probably mostly present as particulates. We conclude that 87Sr/86Sr ratios of archaeological wool textiles recovered from wet burial environments do not accurately reflect wool provenance even after cleaning with the methods investigated.
Original languageEnglish
Pages (from-to)84-93
Number of pages9
JournalJournal of Archaeological Science
Volume53
DOIs
Publication statusPublished - 2015

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funeral
Iceland
environmental pollution
Archaeology
87Sr/86Sr
Wool
Burial
Soil
Cleaning
Values

Bibliographical note

PT: J; NR: 71; TC: 0; J9: J ARCHAEOL SCI; PG: 10; GA: CA0QI; UT: WOS:000348621400009

Cite this

von Holstein, I.C.C. ; Font Morales, L. ; Peacock, E.E. ; Collins, M.J. ; Davies, G.R. / An assessment of procedures to remove exogenous Sr before 87Sr/86Sr analysis of wet archaeological wool textiles. In: Journal of Archaeological Science. 2015 ; Vol. 53. pp. 84-93.
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title = "An assessment of procedures to remove exogenous Sr before 87Sr/86Sr analysis of wet archaeological wool textiles",
abstract = "Strontium isotope analysis (87Sr/86Sr) has been employed as a provenancing tool for archaeological wool textiles. To date, the effect of post-depositional (soil burial environment) contamination on keratin samples, which contain ∼ppm concentrations of Sr, has not been rigorously investigated. We compared published methods for removing exogenous Sr from keratinous textiles, using either: (1) compressed N2 gas, (2) HF(aq) solution (with and without a strong oxidising agent to remove dyestuff) or (3) organic solvents. 87Sr/86Sr ratios and Sr contents were determined in undyed and madder-dyed/alum-mordanted moieties of the same wool textile, buried for up to three years in contrasting environments (marine sediment/fenland bog), and two archaeological textiles recovered in Iceland (one typical and one atypical of local manufacture). Undyed experimental samples had low Sr contents (0.07–0.29 ppm) that were increased by both dyeing (0.14–8.92 ppm) and soil burial (0.11–15.01 ppm). The efficacy of Sr removal was: HF(aq) + oxidising agent > organic solvents > HF(aq) > compressed N2. Unburied samples showed little variation in 87Sr/86Sr ratio between cleaning methods (0.00006–0.00035); buried samples showed greater variation (0.00257–0.00713). Archaeological samples showed Sr contents greater than experimental soil burials (1–118 ppm), and 87Sr/86Sr values consistent with Icelandic groundwater (0.70357–0.70540). No cleaning methods retrieved original (unburied and undyed) 87Sr/86Sr ratios except treatment with compressed N2 in undyed samples. Exogenous Sr from the short term soil burial environment is probably mostly present as particulates. We conclude that 87Sr/86Sr ratios of archaeological wool textiles recovered from wet burial environments do not accurately reflect wool provenance even after cleaning with the methods investigated.",
author = "{von Holstein}, I.C.C. and {Font Morales}, L. and E.E. Peacock and M.J. Collins and G.R. Davies",
note = "PT: J; NR: 71; TC: 0; J9: J ARCHAEOL SCI; PG: 10; GA: CA0QI; UT: WOS:000348621400009",
year = "2015",
doi = "10.1016/j.jas.2014.10.006",
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An assessment of procedures to remove exogenous Sr before 87Sr/86Sr analysis of wet archaeological wool textiles. / von Holstein, I.C.C.; Font Morales, L.; Peacock, E.E.; Collins, M.J.; Davies, G.R.

In: Journal of Archaeological Science, Vol. 53, 2015, p. 84-93.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - An assessment of procedures to remove exogenous Sr before 87Sr/86Sr analysis of wet archaeological wool textiles

AU - von Holstein, I.C.C.

AU - Font Morales, L.

AU - Peacock, E.E.

AU - Collins, M.J.

AU - Davies, G.R.

N1 - PT: J; NR: 71; TC: 0; J9: J ARCHAEOL SCI; PG: 10; GA: CA0QI; UT: WOS:000348621400009

PY - 2015

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N2 - Strontium isotope analysis (87Sr/86Sr) has been employed as a provenancing tool for archaeological wool textiles. To date, the effect of post-depositional (soil burial environment) contamination on keratin samples, which contain ∼ppm concentrations of Sr, has not been rigorously investigated. We compared published methods for removing exogenous Sr from keratinous textiles, using either: (1) compressed N2 gas, (2) HF(aq) solution (with and without a strong oxidising agent to remove dyestuff) or (3) organic solvents. 87Sr/86Sr ratios and Sr contents were determined in undyed and madder-dyed/alum-mordanted moieties of the same wool textile, buried for up to three years in contrasting environments (marine sediment/fenland bog), and two archaeological textiles recovered in Iceland (one typical and one atypical of local manufacture). Undyed experimental samples had low Sr contents (0.07–0.29 ppm) that were increased by both dyeing (0.14–8.92 ppm) and soil burial (0.11–15.01 ppm). The efficacy of Sr removal was: HF(aq) + oxidising agent > organic solvents > HF(aq) > compressed N2. Unburied samples showed little variation in 87Sr/86Sr ratio between cleaning methods (0.00006–0.00035); buried samples showed greater variation (0.00257–0.00713). Archaeological samples showed Sr contents greater than experimental soil burials (1–118 ppm), and 87Sr/86Sr values consistent with Icelandic groundwater (0.70357–0.70540). No cleaning methods retrieved original (unburied and undyed) 87Sr/86Sr ratios except treatment with compressed N2 in undyed samples. Exogenous Sr from the short term soil burial environment is probably mostly present as particulates. We conclude that 87Sr/86Sr ratios of archaeological wool textiles recovered from wet burial environments do not accurately reflect wool provenance even after cleaning with the methods investigated.

AB - Strontium isotope analysis (87Sr/86Sr) has been employed as a provenancing tool for archaeological wool textiles. To date, the effect of post-depositional (soil burial environment) contamination on keratin samples, which contain ∼ppm concentrations of Sr, has not been rigorously investigated. We compared published methods for removing exogenous Sr from keratinous textiles, using either: (1) compressed N2 gas, (2) HF(aq) solution (with and without a strong oxidising agent to remove dyestuff) or (3) organic solvents. 87Sr/86Sr ratios and Sr contents were determined in undyed and madder-dyed/alum-mordanted moieties of the same wool textile, buried for up to three years in contrasting environments (marine sediment/fenland bog), and two archaeological textiles recovered in Iceland (one typical and one atypical of local manufacture). Undyed experimental samples had low Sr contents (0.07–0.29 ppm) that were increased by both dyeing (0.14–8.92 ppm) and soil burial (0.11–15.01 ppm). The efficacy of Sr removal was: HF(aq) + oxidising agent > organic solvents > HF(aq) > compressed N2. Unburied samples showed little variation in 87Sr/86Sr ratio between cleaning methods (0.00006–0.00035); buried samples showed greater variation (0.00257–0.00713). Archaeological samples showed Sr contents greater than experimental soil burials (1–118 ppm), and 87Sr/86Sr values consistent with Icelandic groundwater (0.70357–0.70540). No cleaning methods retrieved original (unburied and undyed) 87Sr/86Sr ratios except treatment with compressed N2 in undyed samples. Exogenous Sr from the short term soil burial environment is probably mostly present as particulates. We conclude that 87Sr/86Sr ratios of archaeological wool textiles recovered from wet burial environments do not accurately reflect wool provenance even after cleaning with the methods investigated.

U2 - 10.1016/j.jas.2014.10.006

DO - 10.1016/j.jas.2014.10.006

M3 - Article

VL - 53

SP - 84

EP - 93

JO - Journal of Archaeological Science

JF - Journal of Archaeological Science

SN - 0305-4403

ER -