Operational speciation of uranium in inter-tidal sediments from the vicinity of a phosphoric acid plant by means of the BCR sequential extraction procedure and ICP-MS

S E Howe, C M Davidson, M McCartney

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A method has been developed for the determination of uranium in sediment digests and sequential extracts by ICP-MS. No interferences were found due to the presence of the extractant matrices (0.11 mol l(-1) acetic acid, 0.1 mol l(-1) hydroxylammonium chloride, 1.0 mol l(-1) ammonium acetate and 30% v/v aqua regia) provided U-236 was used as internal standard and the samples were diluted 5-fold with 5% v/v nitric acid prior to analysis. Detection limits (8 ng g(-1) for extracts and 20 ng g(-1) for digests) were adequate for determination of uranium at environmental levels. Results obtained by ICP-MS for aqua regia digests were slightly lower than those obtained by alpha spectrometry, but overall recoveries of uranium by sequential extraction were generally within +/- 10% of pseudototal values. Application of the developed method to inter-tidal sediments collected from the vicinity of the Albright and Wilson phosphoric acid plant, Whitehaven, Cumbria, confirmed the presence of significant technological enhancement of uranium at Whitehaven Harbour but showed that concentrations had decreased since the plant discontinued phosphate ore processing in 1992. Results of the sequential extraction suggested that spillage of phosphate ore (containing up to 120 mu g g(-1) uranium) during shipping may have made a significant contribution to the environmental contamination observed.

LanguageEnglish
Pages163-168
Number of pages6
JournalJournal of Analytical Atomic Spectrometry
Volume14
Issue number2
DOIs
Publication statusPublished - Feb 1999

Fingerprint

Uranium
Sediments
Phosphates
Nitric Acid
Hydroxylamine
Ore treatment
Ports and harbors
Freight transportation
Acetic Acid
Spectrometry
Ores
Contamination
phosphoric acid
Recovery

Keywords

  • uranium
  • spectrometry
  • inter-tidal sediments

Cite this

@article{d7370c5879454869a7a9638cb1e95c19,
title = "Operational speciation of uranium in inter-tidal sediments from the vicinity of a phosphoric acid plant by means of the BCR sequential extraction procedure and ICP-MS",
abstract = "A method has been developed for the determination of uranium in sediment digests and sequential extracts by ICP-MS. No interferences were found due to the presence of the extractant matrices (0.11 mol l(-1) acetic acid, 0.1 mol l(-1) hydroxylammonium chloride, 1.0 mol l(-1) ammonium acetate and 30{\%} v/v aqua regia) provided U-236 was used as internal standard and the samples were diluted 5-fold with 5{\%} v/v nitric acid prior to analysis. Detection limits (8 ng g(-1) for extracts and 20 ng g(-1) for digests) were adequate for determination of uranium at environmental levels. Results obtained by ICP-MS for aqua regia digests were slightly lower than those obtained by alpha spectrometry, but overall recoveries of uranium by sequential extraction were generally within +/- 10{\%} of pseudototal values. Application of the developed method to inter-tidal sediments collected from the vicinity of the Albright and Wilson phosphoric acid plant, Whitehaven, Cumbria, confirmed the presence of significant technological enhancement of uranium at Whitehaven Harbour but showed that concentrations had decreased since the plant discontinued phosphate ore processing in 1992. Results of the sequential extraction suggested that spillage of phosphate ore (containing up to 120 mu g g(-1) uranium) during shipping may have made a significant contribution to the environmental contamination observed.",
keywords = "uranium, spectrometry, inter-tidal sediments",
author = "Howe, {S E} and Davidson, {C M} and M McCartney",
year = "1999",
month = "2",
doi = "10.1039/A806778C",
language = "English",
volume = "14",
pages = "163--168",
journal = "Journal of Analytical Atomic Spectrometry",
issn = "0267-9477",
number = "2",

}

TY - JOUR

T1 - Operational speciation of uranium in inter-tidal sediments from the vicinity of a phosphoric acid plant by means of the BCR sequential extraction procedure and ICP-MS

AU - Howe, S E

AU - Davidson, C M

AU - McCartney, M

PY - 1999/2

Y1 - 1999/2

N2 - A method has been developed for the determination of uranium in sediment digests and sequential extracts by ICP-MS. No interferences were found due to the presence of the extractant matrices (0.11 mol l(-1) acetic acid, 0.1 mol l(-1) hydroxylammonium chloride, 1.0 mol l(-1) ammonium acetate and 30% v/v aqua regia) provided U-236 was used as internal standard and the samples were diluted 5-fold with 5% v/v nitric acid prior to analysis. Detection limits (8 ng g(-1) for extracts and 20 ng g(-1) for digests) were adequate for determination of uranium at environmental levels. Results obtained by ICP-MS for aqua regia digests were slightly lower than those obtained by alpha spectrometry, but overall recoveries of uranium by sequential extraction were generally within +/- 10% of pseudototal values. Application of the developed method to inter-tidal sediments collected from the vicinity of the Albright and Wilson phosphoric acid plant, Whitehaven, Cumbria, confirmed the presence of significant technological enhancement of uranium at Whitehaven Harbour but showed that concentrations had decreased since the plant discontinued phosphate ore processing in 1992. Results of the sequential extraction suggested that spillage of phosphate ore (containing up to 120 mu g g(-1) uranium) during shipping may have made a significant contribution to the environmental contamination observed.

AB - A method has been developed for the determination of uranium in sediment digests and sequential extracts by ICP-MS. No interferences were found due to the presence of the extractant matrices (0.11 mol l(-1) acetic acid, 0.1 mol l(-1) hydroxylammonium chloride, 1.0 mol l(-1) ammonium acetate and 30% v/v aqua regia) provided U-236 was used as internal standard and the samples were diluted 5-fold with 5% v/v nitric acid prior to analysis. Detection limits (8 ng g(-1) for extracts and 20 ng g(-1) for digests) were adequate for determination of uranium at environmental levels. Results obtained by ICP-MS for aqua regia digests were slightly lower than those obtained by alpha spectrometry, but overall recoveries of uranium by sequential extraction were generally within +/- 10% of pseudototal values. Application of the developed method to inter-tidal sediments collected from the vicinity of the Albright and Wilson phosphoric acid plant, Whitehaven, Cumbria, confirmed the presence of significant technological enhancement of uranium at Whitehaven Harbour but showed that concentrations had decreased since the plant discontinued phosphate ore processing in 1992. Results of the sequential extraction suggested that spillage of phosphate ore (containing up to 120 mu g g(-1) uranium) during shipping may have made a significant contribution to the environmental contamination observed.

KW - uranium

KW - spectrometry

KW - inter-tidal sediments

U2 - 10.1039/A806778C

DO - 10.1039/A806778C

M3 - Article

VL - 14

SP - 163

EP - 168

JO - Journal of Analytical Atomic Spectrometry

T2 - Journal of Analytical Atomic Spectrometry

JF - Journal of Analytical Atomic Spectrometry

SN - 0267-9477

IS - 2

ER -