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| [PMID]: | 28213127 |
| [Au] Autor: | May D; Nelson AN; Schultz MK |
| [Ad] Endereço: | State Hygienic Laboratory at the University of Iowa, Coralville, IA 52241, United States; Interdisciplinary Human Toxicology Program, University of Iowa, Iowa City, IA 52242, United States. Electronic address: dustin-may@uiowa.edu. |
| [Ti] Título: | Quantitation of lead-210 ( Pb) using lead-203 ( Pb) as a "Massless" yield tracer. |
| [So] Source: | J Environ Radioact;171:93-98, 2017 May. | | [Is] ISSN: | 1879-1700 |
| [Cp] País de publicação: | England |
| [La] Idioma: | eng |
| [Ab] Resumo: | Determination of Pb-210 ( Pb) in aqueous solution is a common radioanalytical challenge in environmental science. Widely used methods for undertaking these analyses (e.g., ASTM D7535) rely on the use of stable lead (Pb) as a yield tracer that takes into account losses of Pb that inevitably occur during elemental/radiochemical separations of the procedures. Although effective, these methods introduce technical challenges that can be difficult to track and potentially introduce uncertainty that can be difficult to quantify. Examples of these challenges include interference from endogenous stable Pb in complex sample matrices; contamination of stable Pb carrier with Pb; and high detection limits due to counting efficiency limitations. We hypothesized that many of these challenges could be avoided by the use of the electron-capture, gamma-emitting isotope, Pb as a chemical yield tracer in the analysis of Pb. A series of experiments were performed to evaluate the efficacy of Pb as a tracer. Four different matrices were analyzed, including a complex matrix (hydraulic-fracturing produced fluids); and samples comprising less complicated matrices (i.e., river water, deionized water, and tap water). Separation techniques and counting methodologies were also compared and optimized. Due to a relatively short-half life (52 h), Pb tracer is effectively massless for the purposes of chemical separations, allowing for reduced chromatography column resin bed volumes. Because Pb is a gamma emitter (279 keV; 81% intensity), recovery can be determined non-destructively in a variety of matrices, including liquid scintillation cocktail. The use of liquid scintillation as a counting methodology allowed for determination of Pb activities via Pb or Po; and recoveries of greater than 90% are routinely achievable using this approach. The improved method for the analysis of Pb in aqueous matrices allows for the analysis of complex matrices, at reduced cost, while providing greater counting flexibility in achieving acceptable detections limits. |
| [Mh] Termos MeSH primário: |
Radioisótopos de Chumbo/análise
Monitoramento de Radiação/métodos
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| [Mh] Termos MeSH secundário: |
Limite de Detecção
Reprodutibilidade dos Testes
Contagem de Cintilação
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| [Pt] Tipo de publicação: | JOURNAL ARTICLE |
[Nm] Nome de substância:
| 0 (Lead Radioisotopes) |
| [Em] Mês de entrada: | 1704 |
| [Cu] Atualização por classe: | 170428 |
[Lr] Data última revisão:
| 170428 |
| [Sb] Subgrupo de revista: | IM |
| [Da] Data de entrada para processamento: | 170219 |
| [St] Status: | MEDLINE |
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